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Securities (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Securities [Abstract]      
Securities classified as trading $ 0   $ 0
Proceeds from sales of securities available for sale 213,877,000 $ 141,716,000  
Realized gain 0 1,500,000  
Realized loss 0 $ 0  
Securities pledged as collateral $ 3,600,000,000   $ 3,800,000,000