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Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | $ (3,576) | $ 22,302
Total other comprehensive income (loss), tax expense (benefit) | (889) | 5,589
Other comprehensive (loss) income, net of tax | (2,687) | 16,713
Securities available for sale: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (6,192) | 20,714
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (1,558) | 5,183
Other comprehensive income (loss), before reclassifications, net of tax | (4,634) | 15,531
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax | 3,275 | 3,128
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit) | 837 | 800
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax | 2,438 | 2,328
Total other comprehensive income (loss), pre-tax | (2,917) | 23,842
Total other comprehensive income (loss), tax expense (benefit) | (721) | 5,983
Other comprehensive (loss) income, net of tax | (2,196) | 17,859
Derivative instruments: |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (765) | (1,656)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (195) | (424)
Other comprehensive income (loss), before reclassifications, net of tax | (570) | (1,232)
Total other comprehensive income (loss), pre-tax | (765) | (1,656)
Total other comprehensive income (loss), tax expense (benefit) | (195) | (424)
Other comprehensive (loss) income, net of tax | (570) | (1,232)
Amortization of net actuarial loss recognized in net periodic pension cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, pre-tax | 106 | 116
Reclassification from AOCI, tax expense (benefit) | 27 | 30
Reclassification from AOCI, net of tax | 79 | 86
Total defined benefit pension and post-retirement benefit plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | 106 | 116
Total other comprehensive income (loss), tax expense (benefit) | 27 | 30
Other comprehensive (loss) income, net of tax | $ 79 | $ 86

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