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Loan Sales and Servicing - Valuation Assumptions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]    
Fair value of MSRs $ 50,776 $ 51,428
Composition of residential loans serviced for others, percentage 100.00% 100.00%
Weighted average life (in years) 7 years 6 years 6 months
Prepayment speed: 6.60% 15.70%
Effect on fair value of a 10% increase $ (1,502) $ (1,646)
Effect on fair value of a 20% increase $ (2,909) $ (3,184)
Weighted average option adjusted spread: 8.70% 8.10%
Effect on fair value of a 10% increase $ (1,756) $ (1,758)
Effect on fair value of a 20% increase $ (3,400) $ (3,402)
Fixed rate mortgage loan    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 97.40% 97.30%
Adjustable rate mortgage loan    
Servicing Assets at Fair Value [Line Items]    
Composition of residential loans serviced for others, percentage 2.60% 2.70%