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Goodwill, Intangible Assets, and Servicing Assets - Servicing Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Balance at beginning of period $ 21,407 $ 24,866 $ 23,132 $ 24,710 $ 24,710
Additions through originations of servicing assets 619 1,600 946 3,316  
Amortization (2,029) (2,086) (4,081) (3,646)  
Adjustments 0 670 0 670  
Balance at end of period 19,997 $ 25,050 19,997 $ 25,050 23,132
Principal balances of loans serviced for other institutions $ 1,560,000   $ 1,560,000   $ 1,550,000
SBA Servicing Assets: Weighted-average discount rate     10.98%   11.23%
SBA Servicing Assets: Constant prepayment rate     13.40%   11.09%
Mortgage Servicing Assets: Weighted-average discount rate     9.25%   10.25%
Mortgage Servicing Assets: Constant prepayment rate     9.86%   7.13%