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Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Financial Instruments      
Net gain (loss) from changes in the fair value of derivatives $ 8,800 $ (3,600) $ (800)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (loss) on derivative instruments, net Gain (loss) on derivative instruments, net Gain (loss) on derivative instruments, net
Mortgage servicing rights $ 69,912 $ 69,346 $ 130,230
Income from Mortgage Service Rights      
Derivative Financial Instruments      
Mortgage servicing rights 69,900 69,300 130,200
Agency Business | Other Income      
Derivative Financial Instruments      
Unrealized gain (loss) on derivatives (3,700) 3,500 (1,500)
Realized (loss) gain on derivatives $ (1,600) (26,900) $ 100
Treasury futures      
Derivative Financial Instruments      
Derivative, maturity term 3 months    
Derivative asset, treasury futures $ 1,500 9,500  
Cash posted as collateral 1,900 6,300  
Unrealized gain (loss) on derivatives $ (400) $ 3,200  
Treasury futures | Minimum      
Derivative Financial Instruments      
Treasury futures rate period 5 years    
Treasury futures | Maximum      
Derivative Financial Instruments      
Treasury futures rate period 10 years    
Credit Default Swap      
Derivative Financial Instruments      
Derivative swap default credit 5 years