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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |
Premium amortization | $ (85,506) | $ (110,997) | $ (121,994)
Discount accretion | 21,613 | 13,597 | 2,752
Net (premium amortization) discount accretion | $ (63,893) | $ (97,400) | $ (119,242)

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