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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Depreciation expense $ 6,356 $ 6,810 $ 13,439 $ 11,850
Amortization of mortgage servicing rights 12,697 8,347 25,412 21,153
Amortization of debt discount 268 178 539 383
Amortization of debt issuance costs 661 3,221 1,334 6,498
Servicing [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 1,466 1,206 2,869 2,340
Amortization of mortgage servicing rights 12,627 8,269 25,271 20,994
Amortization of debt discount 0 178 0 383
Amortization of debt issuance costs 0 2,889 0 5,822
Lending [Member]        
Segment Reporting Information [Line Items]        
Depreciation expense 55 65 105 136
Amortization of mortgage servicing rights 70 78 141 159
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 4,835 5,539 10,465 9,374
Amortization of mortgage servicing rights 0 0 0 0
Amortization of debt discount 268 0 539 0
Amortization of debt issuance costs $ 661 $ 332 $ 1,334 $ 676