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Securities Securities - Premium Amortization and Discount Accretion Included in Income on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (31,540) | $ (29,511) | $ (94,873) | $ (88,798)
Discount accretion | 637 | 1,274 | 1,793 | 3,835
Net (premium amortization) discount accretion | $ (30,903) | $ (28,237) | $ (93,080) | $ (84,963)

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