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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Depreciation expense $ 6,115 $ 6,356 $ 12,640 $ 13,439
Amortization of mortgage servicing rights   12,697   25,412
Amortization of debt discount 442 268 706 539
Amortization of debt issuance costs 1,005 661 1,662 1,334
Servicing [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 1,256 1,466 2,613 2,869
Amortization of mortgage servicing rights   12,627   25,271
Amortization of debt discount 0 0 0 0
Amortization of debt issuance costs 0 0 0 0
Lending [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 25 55 54 105
Amortization of mortgage servicing rights   70   141
Amortization of debt discount 0 0 0 0
Amortization of debt issuance costs 0 0 0 0
Corporate Items and Other [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 4,834 4,835 9,973 10,465
Amortization of mortgage servicing rights   0   0
Amortization of debt discount 442 268 706 539
Amortization of debt issuance costs $ 1,005 $ 661 $ 1,662 $ 1,334