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Operating Expenses - Components of Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Income and Expenses [Abstract]    
Fixed compensation expense $ 6,439 $ 6,002
Variable compensation expense 6,907 3,933
Equity compensation expense 2,697 2,176
Total compensation expense 16,043 12,111
Systems and consulting 1,866 1,638
Loan acquisition costs 1,818 1,205
Office costs 1,140 1,103
Accounting and legal 834 926
Corporate costs 504 440
Other operating expenses 825 803
Total Operating Expenses $ 23,030 $ 18,226