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Securities Securities - (Premium Amortization and Discount Accretion Included in Income on Securities) (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] |  |  |
Premium amortization | $ (120,785) | $ (108,483) | $ (97,841)
Discount accretion | 5,227 | 7,955 | 7,908
Net (premium amortization) discount accretion | $ (115,558) | $ (100,528) | $ (89,933)

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