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Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 194,105 | $ 83,968
Gross Realized Gains from sales of debt securities available for sale | 435 | 1,847
Gross Realized Losses from sales of debt securities available for sale | (186) | 0
Investment securities gain (loss), net | $ 249 | $ 1,847

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