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Intangible Assets - Servicing Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period $ 12,000 $ 10,341 $ 10,341
Additions through originations of servicing assets 777 1,045  
Amortization (921) (857)  
Balance at end of period $ 11,856 $ 10,529 $ 12,000
Minimum      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Weighted-average discount rate 5.57%   5.59%
Constant prepayment rate 7.20%   7.30%
Maximum      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Weighted-average discount rate 6.12%   6.01%
Constant prepayment rate 11.90%   11.90%