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Securities Securities (Summary of Gross Realized Gains and Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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