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HMBS Related Obligations	12 Months Ended
HMBS Related Obligations	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
HMBS Related Obligations Disclosure	HMBS Related Obligations The weighted-average stated interest rate on HMBS related obligations was 4.09% and 4.04% at December 31, 2016 and 2015, respectively. At December 31, 2016, the weighted-average remaining life was 3.2 years. The unpaid principal balance and the carrying value of residential loans and real estate owned pledged as collateral to the securitization pools was $9.9 billion and $10.4 billion, respectively, at December 31, 2016.