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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (19,367) | $ (27,165) | $ (66,534) | $ (84,278)
Discount accretion | 5,672 | 4,062 | 15,920 | 7,950
Net (premium amortization) discount accretion | $ (13,695) | $ (23,103) | $ (50,614) | $ (76,328)

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