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Fair Value Measurements - Valuation Techniques and Unobservable Inputs Related to Level 3 Assets (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 38,093 $ 49,990
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 38,093 $ 49,990
Level 3 | Valuation, Market Approach | Selling costs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.080 0.080
Real estate owned, net 0.080 0.080
Level 3 | Valuation, Market Approach | Weighted Average | Selling costs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Individually evaluated loans requiring specific allowance, net 0.080 0.080
Real estate owned, net 0.080 0.080
Level 3 | Discounted Cash Flow | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.062 0.062
Loans held for sale 0.062 0.062
Interest-only strips 0.150 0.150
Level 3 | Discounted Cash Flow | Timing of Resolution/Payoff    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans Held For Sale Term 3 months  
Level 3 | Discounted Cash Flow | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value   0.010
Level 3 | Discounted Cash Flow | Minimum | Collateral Value (% of UPB)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.950 0.94
Level 3 | Discounted Cash Flow | Minimum | Timing of Resolution/Payoff    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment,at fair value 1 month 14 months
Loans Held For Sale Term   31 months
Interest-only strips 0 months 0 months
Level 3 | Discounted Cash Flow | Minimum | Prepayment Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.218 0.175
Level 3 | Discounted Cash Flow | Minimum | Default Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.003 0.050
Level 3 | Discounted Cash Flow | Minimum | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.000  
Level 3 | Discounted Cash Flow | Maximum | Collateral Value (% of UPB)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 1.180 1.04
Level 3 | Discounted Cash Flow | Maximum | Timing of Resolution/Payoff    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment,at fair value 36 months 31 months
Loans Held For Sale Term   34 months
Interest-only strips 12 months 12 months
Level 3 | Discounted Cash Flow | Maximum | Prepayment Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.500 0.300
Level 3 | Discounted Cash Flow | Maximum | Default Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.026 0.150
Level 3 | Discounted Cash Flow | Maximum | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.083  
Level 3 | Discounted Cash Flow | Weighted Average | Discount Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.062 0.062
Loans held for sale 0.062 0.062
Interest-only strips 0.150 0.150
Level 3 | Discounted Cash Flow | Weighted Average | Collateral Value (% of UPB)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 1.060 1.000
Level 3 | Discounted Cash Flow | Weighted Average | Timing of Resolution/Payoff    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment,at fair value 33 months 25 months
Loans Held For Sale Term 3 months 32 months
Interest-only strips 7 months 1 month 15 days
Level 3 | Discounted Cash Flow | Weighted Average | Default Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.010 0.120
Level 3 | Discounted Cash Flow | Weighted Average | Loss Severity Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Loans held for investment, at fair value 0.050 0.010
Level 3 | Individually Evaluated Loans Requiring Specific Allowance, Net    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 19,619 $ 19,340
Level 3 | Real Estate Owned, Net    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 15,743 15,767
Level 3 | Loans Held For Investment At Fair Value    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 1,370 1,539
Level 3 | Loans Held For Sale    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements 1,280 13,106
Level 3 | Interest-only Strips    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total recurring fair value measurements $ 81 $ 238