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Operating Expenses - Components of Operating Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income and Expenses [Abstract]                      
Fixed compensation expense                 $ 24,445 $ 22,111 $ 24,332
Variable compensation expense                 14,589 20,574 16,581
Equity compensation expense                 12,388 10,141 9,093
Total compensation expense                 51,422 52,826 50,006
Systems and consulting                 7,451 7,073 9,037
Loan acquisition costs                 7,697 5,022 5,744
Office costs                 4,705 4,248 4,550
Accounting and legal                 5,529 2,842 3,658
Corporate costs                 1,955 1,856 2,106
Other operating expenses                 4,023 3,289 3,284
Operating expenses before restructuring charges                 82,782 77,156 78,385
Restructuring charges                 0 0 10,401
Total Operating Expenses $ 19,253 $ 21,490 $ 19,009 $ 23,030 $ 20,367 $ 19,922 $ 18,641 $ 18,226 82,782 77,156 88,786
Upfront costs associated with hiring new executive officer                   2,000  
Restructuring Cost and Reserve [Line Items]                      
Restructuring charges                 $ 0 $ 0 10,401
Fixed Compensation Expense                      
Other Income and Expenses [Abstract]                      
Restructuring charges                     5,000
Restructuring Cost and Reserve [Line Items]                      
Restructuring charges                     5,000
Equity Compensation Expense                      
Other Income and Expenses [Abstract]                      
Restructuring charges                     3,000
Restructuring Cost and Reserve [Line Items]                      
Restructuring charges                     3,000
Contract Termination Costs                      
Other Income and Expenses [Abstract]                      
Restructuring charges                     2,000
Restructuring Cost and Reserve [Line Items]                      
Restructuring charges                     $ 2,000