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Mortgage Servicing - Schedule of Composition of Servicing and Subservicing Portfolios by Type of Property Serviced (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Transfers and Servicing [Abstract]      
Servicing $ 75,288,090 $ 72,378,693 $ 73,264,640
Subservicing 49,805,407 53,104,560 1,792,880
NRZ 125,987,243 130,517,237 98,331,356
Assets serviced $ 251,080,740 $ 256,000,490 $ 173,388,876