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SUBSEQUENT EVENTS (Details) (Committed loan repurchase facilities, USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
5/18/2015
Dec. 31, 2013
5/18/2015
Apr. 29, 2014
Subsequent event
5/18/2015
Mar. 31, 2014
Subsequent event
5/18/2015
Subsequent events            
Financing capacity $ 1,150,000,000 $ 1,300,000,000 $ 300,000,000 $ 300,000,000 $ 450,000,000 $ 300,000,000