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Loans Held for Investment and Loans Held for Investment at Fair Value - Schedule of Accrued Interest Receivables Written Off by Reversing Interest Income by Portfolio Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis $ 2,087,716 $ 1,866,781 $ 2,087,716 $ 1,866,781
Financing Receivable, Accrued Interest, Writeoff 1,378 4,228 2,850 5,717
Commercial Purchase Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 366,737 303,373 366,737 303,373
Financing Receivable, Accrued Interest, Writeoff 53 303 192 425
Commercial Refinance Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 690,964 711,397 690,964 711,397
Financing Receivable, Accrued Interest, Writeoff 225 1,961 693 2,633
Residential One To Four Unit Purchase Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 276,896 245,579 276,896 245,579
Financing Receivable, Accrued Interest, Writeoff 63 321 121 404
Residential One To Four Unit Refinance Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 608,543 606,432 608,543 606,432
Financing Receivable, Accrued Interest, Writeoff 281 $ 1,643 801 $ 2,255
Quick Fix One To Four Unit Purchases Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 40,205   40,205  
Financing Receivable, Accrued Interest, Writeoff 639   685  
Quick Fix One To Four Unit Refinances Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 104,371   104,371  
Financing Receivable, Accrued Interest, Writeoff $ 117   $ 358