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HMBS Related Obligations	12 Months Ended
HMBS Related Obligations	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
HMBS Related Obligations Disclosure	HMBS Related Obligations The weighted-average stated interest rate on HMBS related obligations was 4.61% and 4.25% at December 31, 2018 and 2017, respectively. At December 31, 2018, the weighted-average remaining life was 3.0 years. The unpaid principal balance and the carrying value of residential loans and real estate owned pledged as collateral to the securitization pools was $6.8 billion and $7.1 billion, respectively, at December 31, 2018.