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Operating Expenses - Components of Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other Income and Expenses [Abstract]    
Fixed compensation expense $ 8,205 $ 6,439
Variable compensation expense 4,402 6,907
Equity compensation expense 2,953 2,697
Total compensation expense 15,560 16,043
Systems and consulting 1,828 1,866
Loan acquisition costs 1,477 1,818
Office costs 1,304 1,140
Accounting and legal 1,125 834
Corporate costs 674 504
Other operating expenses 1,191 825
Total Operating Expenses $ 23,159 $ 23,030