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Capitalized Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Capitalized Mortgage Servicing Rights      
Balance at beginning of period $ 252,608    
Balance at end of period 255,732   $ 252,608
Valuation allowance 0   0
MSRs      
Capitalized Mortgage Servicing Rights      
Balance at beginning of period 252,608 $ 227,743 227,743
Additions 19,800 26,469  
Amortization (11,865) (11,888)  
Write-downs and payoffs (4,811) (3,393)  
Balance at end of period 255,732 238,931 $ 252,608
Prepayment fees 3,700 2,000  
Expected amortization of capitalized MSRs balances      
2018 (nine months ending 12/31/2018) 35,767    
2019 44,539    
2020 39,231    
2021 31,900    
2022 25,314    
2023 20,802    
Thereafter 58,179    
Finite-lived intangible assets, net $ 255,732    
MSRs | Minimum      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 8.00%    
MSRs | Maximum      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 15.00%    
MSRs | Weighted average      
Capitalized Mortgage Servicing Rights      
Percentage of MSRs discount rate 12.00%    
Estimated life remaining 7 years 2 months 12 days   7 years 2 months 12 days
Acquired MSRs      
Capitalized Mortgage Servicing Rights      
Balance at beginning of period $ 143,270 194,801 $ 194,801
Amortization (7,995) (10,462)  
Write-downs and payoffs (3,341) (3,393)  
Balance at end of period 131,934 180,946 143,270
Originated MSRs      
Capitalized Mortgage Servicing Rights      
Balance at beginning of period 109,338 32,942 32,942
Additions 19,800 26,469  
Amortization (3,870) (1,426)  
Write-downs and payoffs (1,470)    
Balance at end of period $ 123,798 $ 57,985 $ 109,338