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Securities (Gross Realized Gains and Losses on Sales of Securities Available-for-Sale) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities [Abstract]      
Gross realized gains $ 284 $ 626 $ 1,199
Gross realized losses 0 0 29
Proceeds from sale of securities 110,748 44,976 $ 66,263
Available-for-sale Securities Pledged as Collateral $ 230,263 $ 97,671