Quarterly report pursuant to Section 13 or 15(d)

Other Financing Lines of Credit - Summary Of Components of other financing lines of credit (Detail)

v3.21.2
Other Financing Lines of Credit - Summary Of Components of other financing lines of credit (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Feb. 28, 2021
Dec. 31, 2020
Line of Credit Facility [Line Items]      
Total Capacity $ 6,066,690    
Outstanding borrowings 3,412,234   $ 2,973,743
Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Total Capacity 3,688,951    
Outstanding borrowings 1,940,176   1,997,464
Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Total Capacity 1,613,715    
Outstanding borrowings 1,159,093   767,959
Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Total Capacity 764,024    
Outstanding borrowings $ 312,965   208,320
March 2026 $150M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2026    
Interest rate LIBOR + applicable margin    
Collateral pledge MSRs    
Total Capacity $ 150,000    
Outstanding borrowings $ 125,113   0
March 2022 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 155,468   97,225
March 2022 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge N/A    
Total Capacity $ 200,000    
Outstanding borrowings $ 189,464   302,877
March 2022 $225M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 225,000    
Outstanding borrowings $ 163,678   154,097
March 2022 $300M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 300,000    
Outstanding borrowings $ 192,417   182,015
February 2022 $300M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date February 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 300,000    
Outstanding borrowings $ 186,754   0
May 2022 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date May 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 189,050   109,463
October 2021 $250M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date October 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 250,000    
Outstanding borrowings $ 65,541   170,174
August 2021 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date August 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 59,663   126,047
August 2021 $300M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date August 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 300,000    
Outstanding borrowings $ 40,562   15,719
July 2021 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date July 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 167,207   122,075
April 2022 $250M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 250,000    
Outstanding borrowings $ 122,412   225,837
April 2022 $250M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 250,000    
Outstanding borrowings $ 214,245   173,484
May 2022 $350M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date May 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 350,000    
Outstanding borrowings $ 102,332   283,821
February 2021 $50M Facility      
Line of Credit Facility [Line Items]      
Total Capacity   $ 50,000  
February 2021 $50M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date February 2021    
Interest rate Prime + applicable margin; 5.00% floor    
Collateral pledge MSRs    
Total Capacity $ 50,000    
Outstanding borrowings     50,000
October 2021 $200M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date October 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 166,564   158,114
$200M Repo Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date N/A    
Interest rate Bond accrual rate + applicable margin    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 200,000    
Outstanding borrowings $ 176,549   174,578
$1.2M Repo Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date N/A    
Interest rate LIBOR + applicable margin    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 1,215    
Outstanding borrowings $ 1,215   1,188
April 2022 $50M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2022    
Interest rate Prime + applicable margin; 6.00% floor    
Collateral pledge Unsecuritized Tails    
Total Capacity $ 50,000    
Outstanding borrowings $ 38,757   37,442
August 2021 $50M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date August 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 50,000    
Outstanding borrowings $ 24,329   2,860
October 2021 $400M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date October 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 400,000    
Outstanding borrowings $ 257,257   84,124
December 2021 $100M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date December 2021    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 100,000    
Outstanding borrowings $ 89,226   61,220
March 2022 $100M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date March 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 100,000    
Outstanding borrowings $ 87,936   15,803
April 2022 $52.5M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 52,500    
Outstanding borrowings $ 52,500   50,239
April 2022 $45M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2022    
Interest rate 9.00%    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 45,000    
Outstanding borrowings $ 28,220   26,875
February 2024 $90M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date February 2024    
Interest rate LIBOR + applicable margin    
Collateral pledge MSRs    
Total Capacity $ 90,000    
Outstanding borrowings $ 89,497   0
$2M Securities Repo Line | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date N/A    
Interest rate Distributed Bond Interest + 50 bps    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 2,000    
Outstanding borrowings     6,411
April 2023 $145M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date April 2023    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 145,000    
Outstanding borrowings $ 86,055   100,070
September 2022 $150M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date September 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge Encumbered Agricultural Loans    
Total Capacity $ 150,000    
Outstanding borrowings $ 112,229   52,300
February 2022 $150M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date February 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 150,000    
Outstanding borrowings $ 33,768    
August 2022 $75M | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date August 2022    
Interest rate 2.50% - 3.25%    
Collateral pledge Encumbered Agricultural Loans    
Total Capacity $ 75,000    
Outstanding borrowings $ 24,746    
Securities Repo Line | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Interest rate LIBOR + applicable margin    
Collateral pledge Mortgage Related Asset    
Total Capacity $ 13,951    
Outstanding borrowings $ 13,951    
June 2023 $300M Facility | Mortgage Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date June 2023    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 300,000    
June 2022 $75M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date June 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 75,000    
Outstanding borrowings $ 72,479   11,423
June 2022 $200M Facility | Reverse Line Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date June 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 200,000    
Outstanding borrowings $ 26,883   128,723
November 2023 $65M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date November 2023    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 65,000    
Outstanding borrowings $ 30,528   28,064
$4M Securities Repo Line | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date N/A    
Interest rate LIBOR + applicable margin    
Collateral pledge Mortgage Related Assets    
Total Capacity $ 4,024    
Outstanding borrowings $ 4,024    
February 2022 $150M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date February 2022    
Interest rate LIBOR + applicable margin    
Collateral pledge First Lien Mortgages    
Total Capacity $ 150,000    
Outstanding borrowings $ 715    
August 2022 $25M Facility | Commercial Lines Of Credit [Member]      
Line of Credit Facility [Line Items]      
Maturity date August 2022    
Interest rate 10.00%    
Collateral pledge Second Lien Mortgages    
Total Capacity $ 25,000    
Outstanding borrowings $ 20,900   $ 21,475