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Securities (Schedule of Proceeds from the Sales of Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-Sale      
Proceeds from Sales $ 49,459 $ 165,102 $ 18,999
Gross Gains on Sales 596 1,979 725
Income Taxes on Gross Gains 209 693 $ 254
Carrying amount of securities pledged $ 165,404 $ 186,572