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Business Segment Reporting - Schedule of Depreciation and Amortization by Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Depreciation expense $ 27,202 $ 26,886 $ 25,338
Amortization of mortgage servicing rights   51,788 32,978
Amortization of debt discount 1,183 1,114 4,177
Amortization of debt issuance costs 2,921 2,738 25,662
Servicing [Member]      
Segment Reporting Information [Line Items]      
Depreciation expense 4,601 5,797 6,804
Amortization of mortgage servicing rights   51,515 32,669
Amortization of debt discount 0 0 727
Amortization of debt issuance costs 0 0 13,455
Lending [Member]      
Segment Reporting Information [Line Items]      
Depreciation expense 103 194 228
Amortization of mortgage servicing rights   273 309
Amortization of debt discount 0 0 0
Amortization of debt issuance costs 0 0 0
Corporate Items and Other [Member]      
Segment Reporting Information [Line Items]      
Depreciation expense 22,498 20,895 18,306
Amortization of mortgage servicing rights   0 0
Amortization of debt discount 1,183 1,114 3,450
Amortization of debt issuance costs $ 2,921 $ 2,738 $ 12,207