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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The following tables present a reconciliation of the changes in the components of other comprehensive income and loss for the periods indicated, including the amount of tax (expense) benefit allocated to each component:
|  | For the Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
(In thousands) |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount
Debt Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value |  | $ | 13,646 |  |  | $ | (2,932) |  |  | $ | 10,714 |  |  | $ | (172,699) |  |  | $ | 37,131 |  |  | $ | (135,568) |  |  | $ | (38,832) |  |  | $ | 8,349 |  |  | $ | (30,483) |
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM |  | (6,781) |  |  | 1,458 |  |  | (5,323) |  |  | (5,715) |  |  | 1,229 |  |  | (4,486) |  |  | — |  |  | — |  |  | — |
Less: reclassification adjustment for net realized losses(1) |  | (10,310) |  |  | 2,217 |  |  | (8,093) |  |  | (912) |  |  | 196 |  |  | (716) |  |  | — |  |  | — |  |  | — |
Net change in fair value |  | 30,737 |  |  | (6,607) |  |  | 24,130 |  |  | (166,072) |  |  | 35,706 |  |  | (130,366) |  |  | (38,832) |  |  | 8,349 |  |  | (30,483) |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value |  | 179 |  |  | (38) |  |  | 141 |  |  | 10,038 |  |  | (2,158) |  |  | 7,880 |  |  | 2,987 |  |  | (642) |  |  | 2,345 |
Less: reclassified AOCI gain (loss) into interest expense(2) |  | 3,364 |  |  | (723) |  |  | 2,641 |  |  | 263 |  |  | (57) |  |  | 206 |  |  | (2,254) |  |  | 485 |  |  | (1,769) |
Less: reclassified AOCI gain into interest income(3) |  | (3,446) |  |  | 741 |  |  | (2,705) |  |  | 5 |  |  | (1) |  |  | 4 |  |  | 1,614 |  |  | (347) |  |  | 1,267 |
Net change in fair value |  | 261 |  |  | (56) |  |  | 205 |  |  | 9,770 |  |  | (2,100) |  |  | 7,670 |  |  | 3,627 |  |  | (780) |  |  | 2,847 |
Postretirement Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) |  | 114 |  |  | (25) |  |  | 89 |  |  | 2,859 |  |  | (614) |  |  | 2,245 |  |  | (20) |  |  | 4 |  |  | (16) |
Less: Amortization of net actuarial loss(4) |  | 3 |  |  | (1) |  |  | 2 |  |  | (947) |  |  | 203 |  |  | (744) |  |  | (894) |  |  | 192 |  |  | (702) |
Less: Amortization of net prior service credits(4) |  | 24 |  |  | (5) |  |  | 19 |  |  | 24 |  |  | (5) |  |  | 19 |  |  | 24 |  |  | (5) |  |  | 19 |
Net gain (loss) on postretirement plans |  | 87 |  |  | (19) |  |  | 68 |  |  | 3,782 |  |  | (812) |  |  | 2,970 |  |  | 850 |  |  | (183) |  |  | 667 |
Other comprehensive (loss) income |  | $ | 31,085 |  |  | $ | (6,682) |  |  | $ | 24,403 |  |  | $ | (152,520) |  |  | $ | 32,794 |  |  | $ | (119,726) |  |  | $ | (34,355) |  |  | $ | 7,386 |  |  | $ | (26,969) |
(1) Reclassified into net loss on sale of securities in the consolidated statements of income. Refer to Note 2 of the consolidated financial statements for further details. (2) Reclassified into interest on deposits, borrowings and/or junior subordinated debentures on the consolidated statements of income. Refer to Note 12 of the consolidated financial statements for further details. (3) Reclassified into interest and fees on loans on the consolidated statements of income. Refer to Note 12 of the consolidated financial statements for further details. (4) Reclassified into other expenses on the consolidated statements of income. Refer to Note 18 of the consolidated financial statements for further details.
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in each component of AOCI for the periods indicated:
(In thousands) |  | Net Unrealized (Losses) Gains on Debt Securities(1) |  | Net Unrealized (Losses) Gains on Cash Flow Hedges(1) |  | Defined Benefit Postretirement Plans(1) |  | AOCI(1)
Balance at December 31, 2020 |  | $ | 29,310 |  |  | $ | (4,626) |  |  | $ | (3,944) |  |  | $ | 20,740 |
Other comprehensive income (loss) before reclassifications |  | (30,483) |  |  | 2,345 |  |  | — |  |  | (28,138) |
Less: Amounts reclassified from AOCI |  | — |  |  | (502) |  |  | (667) |  |  | (1,169) |
Other comprehensive income (loss) |  | (30,483) |  |  | 2,847 |  |  | 667 |  |  | (26,969) |
Balance at December 31, 2021 |  | (1,173) |  |  | (1,779) |  |  | (3,277) |  |  | (6,229) |
Other comprehensive income (loss) before reclassifications |  | (126,596) |  |  | 7,880 |  |  | — |  |  | (118,716) |
Less: Amounts reclassified from AOCI |  | 3,770 |  |  | 210 |  |  | (2,970) |  |  | 1,010 |
Other comprehensive income (loss) |  | (130,366) |  |  | 7,670 |  |  | 2,970 |  |  | (119,726) |
Balance at December 31, 2022 |  | (131,539) |  |  | 5,891 |  |  | (307) |  |  | (125,955) |
Other comprehensive (loss) income before reclassifications |  | 21,363 |  |  | 141 |  |  | — |  |  | 21,504 |
Less: Amounts reclassified from AOCI |  | (2,767) |  |  | (64) |  |  | (68) |  |  | (2,899) |
Other comprehensive (loss) income |  | 24,130 |  |  | 205 |  |  | 68 |  |  | 24,403 |
Balance at December 31, 2023 |  | $ | (107,409) |  |  | $ | 6,096 |  |  | $ | (239) |  |  | $ | (101,552) |
(1) All amounts are net of tax.

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