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Capitalized Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Capitalized Mortgage Servicing Rights          
Beginning balance     $ 422,734    
Ending balance $ 403,886   403,886   $ 422,734
MSRs          
Capitalized Mortgage Servicing Rights          
Beginning balance 411,534 $ 418,653 422,734 $ 379,974 379,974
Additions 18,907 22,387 63,002 99,397  
Amortization (14,782) (14,872) (44,532) (43,744)  
Write-downs and payoffs (11,773) (8,885) (37,318) (18,344)  
Ending balance 403,886 417,283 403,886 417,283 422,734
Prepayment fees collected 11,200 11,200 42,600 18,100  
Valuation allowance 0   0   $ 0
Expected amortization of capitalized MSRs balances          
2022 (three months ending 12/31/2022) 14,858   14,858    
2023 58,242   58,242    
2024 56,127   56,127    
2025 53,426   53,426    
2026 49,876   49,876    
2027 44,116   44,116    
Thereafter 127,241   127,241    
Total 403,886   $ 403,886    
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 10 months 24 days   8 years 6 months
Originated          
Capitalized Mortgage Servicing Rights          
Beginning balance 391,397 383,063 $ 395,573 336,466 $ 336,466
Additions 18,907 22,387 63,002 99,397  
Amortization (13,355) (12,345) (39,348) (35,221)  
Write-downs and payoffs (9,957) (7,420) (32,235) (14,957)  
Ending balance 386,992 385,685 386,992 385,685 395,573
Acquired          
Capitalized Mortgage Servicing Rights          
Beginning balance 20,137 35,590 27,161 43,508 43,508
Amortization (1,427) (2,527) (5,184) (8,523)  
Write-downs and payoffs (1,816) (1,465) (5,083) (3,387)  
Ending balance $ 16,894 $ 31,598 $ 16,894 $ 31,598 $ 27,161