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Intangible Assets - Servicing Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Balance at beginning of period $ 11,856 $ 10,529 $ 12,000 $ 10,341 $ 10,341
Additions through originations of servicing assets 1,309 1,144 2,087 2,189  
Amortization (972) (738) (1,894) (1,595)  
Balance at end of period $ 12,193 $ 10,935 $ 12,193 $ 10,935 $ 12,000
Minimum          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Weighted-average discount rate     5.55%   5.32%
Constant prepayment rate     7.40%   7.00%
Maximum          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Weighted-average discount rate     6.01%   5.92%
Constant prepayment rate     11.90%   11.90%