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Investment Securities (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Investment Securities (Textuals) [Abstract]    
Available-for-sale Securities, Transferred to Held-to-maturity Securities, at Carrying Value $ 300  
Securities pledged as collateral 2,100 $ 1,800
Federal Home Loan Bank Stock 64 65
Federal Reserve Bank Stock $ 75 $ 75