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Securities Securities (Summary of Gross Realized Gains and Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Proceeds from Sale of Debt Securities, Available-for-sale $ 32,330 $ 30,403 $ 124,142
Available-for-sale Securities, Gross Realized Gains 235 111 1,181
Available-for-sale Securities, Gross Realized Losses (129) (122) 0
Equity Securities, FV-NI, Gain (Loss) (195) 0 0
Debt and Equity Securities, Gain (Loss) $ (89) $ (11) $ 1,181