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Capitalized Mortgage Servicing Rights - Summary of Capitalized MSRs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Capitalized Mortgage Servicing Rights        
Beginning balance     $ 401,471  
Ending balance $ 392,203   392,203  
MSRs        
Capitalized Mortgage Servicing Rights        
Beginning balance 394,410 $ 411,534 401,471 $ 422,734
Additions 16,550 18,907 49,416 63,002
Amortization (15,900) (14,782) (46,920) (44,532)
Write-downs and payoffs (2,857) (11,773) (11,764) (37,318)
Ending balance 392,203 403,886 392,203 403,886
Expected amortization of capitalized MSRs balances        
2023 (three months ending 12/31/2023) 16,169   16,169  
2024 63,855   63,855  
2025 60,481   60,481  
2026 54,479   54,479  
2027 49,654   49,654  
2028 43,110   43,110  
Thereafter 104,455   104,455  
Total 392,203   392,203  
Originated        
Capitalized Mortgage Servicing Rights        
Beginning balance 383,267 391,397 386,878 395,573
Additions 16,550 18,907 49,416 63,002
Amortization (14,988) (13,355) (43,866) (39,348)
Write-downs and payoffs (2,400) (9,957) (9,999) (32,235)
Ending balance 382,429 386,992 382,429 386,992
Acquired        
Capitalized Mortgage Servicing Rights        
Beginning balance 11,143 20,137 14,593 27,161
Amortization (912) (1,427) (3,054) (5,184)
Write-downs and payoffs (457) (1,816) (1,765) (5,083)
Ending balance $ 9,774 $ 16,894 $ 9,774 $ 16,894