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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis $ 2,299,725 $ 2,006,834 $ 2,299,725 $ 2,006,834
Financing Receivable, Accrued Interest, Writeoff 929 1,598 3,778 8,548
Commercial Purchase Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 426,483 293,886 426,483 293,886
Financing Receivable, Accrued Interest, Writeoff 114 151 306 576
Commercial Refinance Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 710,201 695,664 710,201 695,664
Financing Receivable, Accrued Interest, Writeoff 146 459 838 3,092
Residential One To Four Unit Purchase Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 340,611 282,212 340,611 282,212
Financing Receivable, Accrued Interest, Writeoff 33 215 154 724
Residential One To Four Unit Refinance Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 671,703 735,072 671,703 735,072
Financing Receivable, Accrued Interest, Writeoff 368 $ 773 1,169 $ 4,156
Short Term One To Four Unit Purchase Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 50,758   50,758  
Financing Receivable, Accrued Interest, Writeoff 103   788  
Short Term One To Four Unit Refinance Portfolio Segment        
Financing Receivable Impaired [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 99,969   99,969  
Financing Receivable, Accrued Interest, Writeoff $ 165   $ 523