Annual report pursuant to Section 13 and 15(d)

Fair Value - Summary of Fix And Flip Loans (Detail)

v3.22.0.1
Fair Value - Summary of Fix And Flip Loans (Detail) - Fix And Flip Loans [Member]
12 Months Ended
Dec. 31, 2020
Minimum [Member] | Discount rate [Member]  
Fair Value Fix And Flip Loans Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]  
Discount rate 6.70%
Maximum [Member] | Discount rate [Member]  
Fair Value Fix And Flip Loans Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]  
Discount rate 10.00%
Weighted Average [Member] | Prepayment Rate [Member]  
Fair Value Fix And Flip Loans Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]  
Prepayment rate (SMM) 12.40%
Weighted Average [Member] | Discount rate [Member]  
Fair Value Fix And Flip Loans Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]  
Discount rate 7.20%
Weighted Average [Member] | Loss frequency [Member]  
Fair Value Fix And Flip Loans Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]  
Loss frequency 0.80%