INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Required Payment Receivables (Details) (Purchased Credit Impaired Loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Purchased Credit Impaired Loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually Required Payments Receivable	$ 1,307,248
Cash Flows Expected to be Collected	635,787
Fair Value	$ 508,603