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Mortgage Servicing Rights - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Transfers And Servicing [Abstract]    
Unpaid principal balance $ 2,833,958 $ 2,545,449
Weighted-average prepayment speed (CPR) 8.40% 7.30%
Estimated impact on fair value of a 10% increase $ (1,256) $ (371)
Estimated impact on fair value of a 20% increase $ (2,434) $ (726)
Discount rate 9.54% 10.14%
Estimated impact on fair value of a 100 bp increase $ (1,394) $ (1,201)
Estimated impact on fair value of a 200 bp increase $ (2,679) $ (2,317)
Weighted-average coupon interest rate 3.59% 3.79%
Weighted-average servicing fee (basis points) 0.27% 0.25%
Weighted-average remaining maturity (in months) 328 months 311 months