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Goodwill, Intangible Assets, and Servicing Assets - Servicing Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Servicing Liability at Amortized Cost, Balance $ 1,524,441   $ 1,547,110
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period 26,457 $ 12,000 12,000
Additions through originations of servicing assets 1,296 777  
Amortization (1,812) (921)  
Balance at end of period $ 25,941 $ 11,856 $ 26,457
SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 10.29%   9.85%
SBA Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 8.18%   8.05%
Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 9.66%   7.25%
Mortgage Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 7.71%   13.77%