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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  | $ 259,554 | $ 32,330 | $ 30,403
Available-for-sale Securities, Gross Realized Gains |  | 3,357 | 235 | 111
Available-for-sale Securities, Gross Realized Losses |  | (1,225) | (129) | (122)
Equity Securities, FV-NI, Gain (Loss) | [1] | 0 | 195 | 0
Debt and Equity Securities, Gain (Loss) |  | $ 2,132 | $ (89) | $ (11)
[1] | Other securities losses, net includes net unrealized loss activity associated with equity securities.

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