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Securities Securities - Premium Amortization and Discount Accretion Included in Income on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Premium amortization | $ (16,570) | $ (21,242) | $ (34,523) | $ (47,167)
Discount accretion | 5,032 | 4,843 | 9,737 | 10,248
Net (premium amortization) discount accretion | $ (11,538) | $ (16,399) | $ (24,786) | $ (36,919)

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