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Capitalized Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Capitalized Mortgage Servicing Rights    
Balance at beginning of period $ 273,770  
Balance at end of period 286,420 $ 273,770
Expected amortization of capitalized MSRs balances    
2020 5,249  
2021 4,691  
2022 4,691  
2023 4,691  
2024 3,259  
MSRs    
Capitalized Mortgage Servicing Rights    
Balance at beginning of period 273,770 252,608
Additions 83,756 94,344
Amortization (48,681) (48,124)
Write-downs and payoffs (22,425) (25,058)
Balance at end of period 286,420 273,770
Prepayment fees collected 18,400 21,900
Valuation allowance 0 $ 0
Expected amortization of capitalized MSRs balances    
2020 46,307  
2021 42,538  
2022 37,596  
2023 33,203  
2024 28,981  
Thereafter 97,795  
Total $ 286,420  
MSRs | Weighted average    
Capitalized Mortgage Servicing Rights    
Estimated life remaining 8 years 7 years 7 months 6 days
Acquired MSRs    
Capitalized Mortgage Servicing Rights    
Balance at beginning of period $ 97,084 $ 143,270
Amortization (21,042) (28,958)
Write-downs and payoffs (11,523) (17,228)
Balance at end of period 64,519 97,084
Originated MSRs    
Capitalized Mortgage Servicing Rights    
Balance at beginning of period 176,686 109,338
Additions 83,756 94,344
Amortization (27,639) (19,166)
Write-downs and payoffs (10,902) (7,830)
Balance at end of period $ 221,901 $ 176,686