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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Assets:            
Restricted cash $ 169,088   $ 157,134 $ 17,630    
Loans held for investment, at amortized cost 1,823,039   2,028,262      
Loans held for investment, at fair value 5,460,522   4,729,869      
Retained securities, at fair value 29,924   0      
Mortgage servicing rights 14,307 $ 12,645 12,963 $ 12,940 $ 12,631 $ 13,712
Derivative assets 118   66      
Liabilities:            
Secured financing, net 73,427   286,679      
Securitized debt, at amortized cost 1,570,782   1,705,589      
Securitized debt, at fair value 4,609,891   4,236,737      
Carrying Value            
Assets:            
Cash 76,115   92,103      
Restricted cash 169,088   157,134      
Loans held for investment, at amortized cost 1,823,039   2,028,262      
Loans held for investment, at fair value 5,460,522   4,729,869      
Retained securities, at fair value 29,924          
Accrued interest receivables 53,107   49,678      
Mortgage servicing rights 14,307   12,963      
Derivative assets 118   66      
Liabilities:            
Secured financing, net 73,427   286,679      
Unsecured senior notes, net 486,170          
Warehouse and repurchase facilities, net 311,676   308,506      
Securitized debt, at amortized cost 1,570,782   1,705,589      
Securitized debt, at fair value 4,609,891   4,236,737      
Accrued interest payable 52,961   37,111      
Estimate of Fair Value Measurement            
Assets:            
Cash 76,115   92,103      
Restricted cash 169,088   157,134      
Loans held for investment, at amortized cost 1,780,007   1,976,279      
Loans held for investment, at fair value 5,460,522   4,729,869      
Retained securities, at fair value 29,924          
Accrued interest receivables 53,107   49,678      
Mortgage servicing rights 14,307   12,963      
Derivative assets 118   66      
Liabilities:            
Secured financing, net 74,972   289,660      
Unsecured senior notes, net 497,453          
Warehouse and repurchase facilities, net 311,676   308,506      
Securitized debt, at amortized cost 1,442,690   1,588,620      
Securitized debt, at fair value 4,609,891   4,236,737      
Accrued interest payable 52,961   37,111      
Level 1 | Estimate of Fair Value Measurement            
Assets:            
Cash 76,115   92,103      
Restricted cash 169,088   157,134      
Accrued interest receivables 53,107   49,678      
Liabilities:            
Accrued interest payable 52,961   37,111      
Level 2 | Estimate of Fair Value Measurement            
Assets:            
Derivative assets 118   66      
Liabilities:            
Warehouse and repurchase facilities, net 311,676   308,506      
Securitized debt, at amortized cost 1,442,690   1,588,620      
Securitized debt, at fair value 4,609,891   4,236,737      
Level 3 | Estimate of Fair Value Measurement            
Assets:            
Loans held for investment, at amortized cost 1,780,007   1,976,279      
Loans held for investment, at fair value 5,460,522   4,729,869      
Retained securities, at fair value 29,924          
Mortgage servicing rights 14,307   12,963      
Liabilities:            
Secured financing, net 74,972   $ 289,660      
Unsecured senior notes, net $ 497,453