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Match Funded Advances - Schedule of Match Funded Advances on Residential Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Match Funded Assets [Line Items]    
Match funded advances $ 825,760 $ 937,294
Principal and Interest [Member]    
Match Funded Assets [Line Items]    
Match funded advances 383,896 412,897
Taxes and Insurance [Member]    
Match Funded Assets [Line Items]    
Match funded advances 305,336 374,853
Foreclosures Bankruptcy And Other [Member]    
Match Funded Assets [Line Items]    
Match funded advances $ 136,528 $ 149,544