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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance $ 1,457,149 $ 671,962
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance   336,882
Cumulative effect of fair value election   82,043
Sales and other transfers (567) (131)
Recognized on the sale of residential mortgage loans 1,510 2,378
Purchase of MSRs 54,410 0
Servicing transfers and adjustments (3,313) (1,758)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (64,273) 20,460
Realization of expected future cash flows and other changes [1] (44,725) (37,589)
Ending balance 1,400,191 1,074,247
Fair Value Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 865,587 11,960
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance   336,882
Sales and other transfers (435) 0
Recognized on the sale of residential mortgage loans 1,510 2,378
Purchase of MSRs 54,410 0
Servicing transfers and adjustments 0 (1)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (64,117) 20,460
Realization of expected future cash flows and other changes [1] (31,263) (15,501)
Ending balance 825,692 438,221
Fair Value Non-Agency Mortgage Servicing Rights [Member]    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance 591,562 660,002
Sales and other transfers (132) (131)
Recognized on the sale of residential mortgage loans 0 0
Purchase of MSRs 0 0
Servicing transfers and adjustments (3,313) (1,757)
Changes in fair value:    
Changes in valuation inputs or other assumptions [1] (156) 0
Realization of expected future cash flows and other changes [1] (13,462) (22,088)
Ending balance $ 574,499 $ 636,026
[1] Changes in fair value are recognized in MSR valuation adjustments, net in the unaudited consolidated statements of operations.