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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |
Premium amortization | $ (126,210) | $ (120,785) | $ (108,483)
Discount accretion | 2,425 | 5,227 | 7,955
Net (premium amortization) discount accretion | $ (123,785) | $ (115,558) | $ (100,528)

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