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INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS, EQUITY METHOD INVESTEES - Narrative (Details) - joint_venture
3 Months Ended 9 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]      
Number of restructured joint ventures   2  
Excess MSRs Investees [Member] | MSRs [Member]      
Schedule of Equity Method Investments [Line Items]      
Weighted average discount rate, used to value investments in excess MSRs 9.80%   9.80%