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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (27,165) | $ (30,240) | $ (84,278) | $ (92,016)
Discount accretion | 4,062 | 657 | 7,950 | 1,999
Net (premium amortization) discount accretion | $ (23,103) | $ (29,583) | $ (76,328) | $ (90,017)

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