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Capitalized Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Capitalized Mortgage Servicing Rights      
Beginning balance $ 401,471    
Ending balance 396,634   $ 401,471
MSRs      
Capitalized Mortgage Servicing Rights      
Beginning balance 401,471 $ 422,734 422,734
Additions 13,886   26,971
Amortization (15,416)   (14,972)
Write-downs and payoffs (3,307)   (12,697)
Ending balance 396,634 422,036 401,471
Prepayment fees collected 2,100 16,100  
Valuation allowance 0   $ 0
Expected amortization of capitalized MSRs balances      
2023 (nine months ending 12/31/2023) 46,546    
2024 60,349    
2025 56,515    
2026 50,349    
2027 45,525    
Thereafter 137,350    
Total $ 396,634    
MSRs | Minimum      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 8.00%    
MSRs | Maximum      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 13.00%    
MSRs | Weighted average      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 12.00%    
Estimated life remaining 8 years 7 months 6 days   8 years 7 months 6 days
Originated      
Capitalized Mortgage Servicing Rights      
Beginning balance $ 386,878 395,573 $ 395,573
Additions 13,886   26,971
Amortization (14,287)   (12,927)
Write-downs and payoffs (2,841)   (11,556)
Ending balance 383,636 398,061 386,878
Acquired      
Capitalized Mortgage Servicing Rights      
Beginning balance 14,593 27,161 27,161
Amortization (1,129)   (2,045)
Write-downs and payoffs (466)   (1,141)
Ending balance $ 12,998 $ 23,975 $ 14,593