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Accumulated Other Comprehensive Loss - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Loss |  |  |
Unrealized gain (loss) on investment securities available for sale | $ 14,804 | $ (66,435) | $ (11,487)
Net (gain) loss on the sale of investment securities available for sale (1) | (81) | 1,976 |
Other comprehensive income (loss) on available for sale debt securities | 14,723 | (64,459) | (11,487)
Amortization of actuarial loss (2) | 194 | 198 | 301
Actuarial gain (loss) | 935 | 172 | 1,808
Net change in benefit plan liabilities | 1,129 | 370 | 2,109
Net change in derivatives | (824) | (728) | (322)
Other comprehensive income (loss) | 15,028 | (64,817) | (9,700)
Income tax expense (benefit) | 3,043 | (13,995) | (2,037)
Other comprehensive income (loss) | $ 11,985 | $ (50,822) | $ (7,663)

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