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Securities (Realized Gains and Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds from sales, available-for-sale debt securities | $ 101,129 | $ 39,377 | $ 476,231 | $ 296,252
Gross realized gains, available-for-sale debt securities | 58 | 35 | 3,066 | 2,374
Related tax expense, available-for-sale debt securities | $ 17 | $ 11 | $ 906 | $ 701

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