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Securities Securities (Realized Gains and Losses on Sale of Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Available-for-sale Securities, Gross Realized Gains $ 22 $ 92 $ 10
Available-for-sale Securities, Gross Realized Losses (26) (495) 0
Marketable Securities, Realized Gain (Loss) (4) (403) 10
Proceeds from sale of available-for-sale securities $ 6,207 $ 40,144 $ 5,227