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Capitalized Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Capitalized Mortgage Servicing Rights          
Balance at beginning of period     $ 252,608    
Balance at end of period $ 259,401   259,401   $ 252,608
Valuation allowance 0   0   0
MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 257,021 $ 243,083 252,608 $ 227,743 227,743
Additions 21,368 20,720 59,660 66,273  
Amortization (11,838) (11,711) (35,639) (35,427)  
Write-downs and payoffs (7,150) (4,216) (17,228) (10,713)  
Balance at end of period 259,401 247,876 259,401 247,876 $ 252,608
Prepayment fees collected 7,500 3,800 16,200 7,900  
Expected amortization of capitalized MSRs balances          
2018 (three months ending 12/31/2018) 12,000   12,000    
2019 45,946   45,946    
2020 41,383   41,383    
2021 34,919   34,919    
2022 28,357   28,357    
2023 23,850   23,850    
Thereafter 72,946   72,946    
Finite-lived intangible assets, net 259,401   $ 259,401    
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 4 months 24 days   7 years 2 months 12 days
Acquired MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 120,017 168,189 $ 143,270 194,801 $ 194,801
Amortization (7,052) (8,952) (22,564) (29,074)  
Write-downs and payoffs (4,419) (4,194) (12,160) (10,684)  
Balance at end of period 108,546 155,043 108,546 155,043 143,270
Originated MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 137,004 74,894 109,338 32,942 32,942
Additions 21,368 20,720 59,660 66,273  
Amortization (4,786) (2,759) (13,075) (6,353)  
Write-downs and payoffs (2,731) (22) (5,068) (29)  
Balance at end of period $ 150,855 $ 92,833 $ 150,855 $ 92,833 $ 109,338