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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive (Loss) Income by Component, Net of Tax | Changes in accumulated OCI (loss) by component, net of tax, were as follows for the periods indicated:
| Three Months Ended September 30, 2025
| Investment Securities Available-for-Sale |  | Net Change in Fair Value of Cash Flow Hedges |  | Postretirement Benefits |  | Accumulated Other Comprehensive Income (Loss)
| (In Thousands)
Balance at June 30, 2025 | $ | (39,654) |  |  | $ | (436) |  |  | $ | 712 |  |  | $ | (39,378) |
Other comprehensive income (loss) | 10,173 |  |  | (89) |  |  | — |  |  | 10,084 |
Reclassification adjustment for (income) expense recognized in earnings | — |  |  | 389 |  |  | — |  |  | 389 |
Balance at September 30, 2025 | $ | (29,481) |  |  | $ | (136) |  |  | $ | 712 |  |  | $ | (28,905) |
| Three Months Ended September 30, 2024
| Investment Securities Available-for-Sale |  | Net Change in Fair Value of Cash Flow Hedges |  | Postretirement Benefits |  | Accumulated Other Comprehensive Income (Loss)
| (In Thousands)
Balance at June 30, 2024 | $ | (59,733) |  |  | $ | (3,289) |  |  | $ | 1,329 |  |  | $ | (61,693) |
Other comprehensive income (loss) | 20,429 |  |  | 2,372 |  |  | — |  |  | 22,801 |
Reclassification adjustment for (income) expense recognized in earnings | — |  |  | 811 |  |  | — |  |  | 811 |
Balance at September 30, 2024 | $ | (39,304) |  |  | $ | (106) |  |  | $ | 1,329 |  |  | $ | (38,081) |
| Nine Months Ended September 30, 2025
| Investment Securities Available-for-Sale |  | Net Change in Fair Value of Cash Flow Hedges |  | Postretirement Benefits |  | Accumulated Other Comprehensive Income (Loss)
| (In Thousands)
Balance at December 31, 2024 | $ | (53,718) |  |  | $ | (1,323) |  |  | $ | 2,159 |  |  | $ | (52,882) |
Other comprehensive income (loss) | 24,237 |  |  | 6 |  |  | (1,955) |  |  | 22,288 |
Reclassification adjustment for (income) expense recognized in earnings | — |  |  | 1,181 |  |  | 508 |  |  | 1,689 |
Balance at September 30, 2025 | $ | (29,481) |  |  | $ | (136) |  |  | $ | 712 |  |  | $ | (28,905) |
| Nine Months Ended September 30, 2024
| Investment Securities Available-for-Sale |  | Net Change in Fair Value of Cash Flow Hedges |  | Postretirement Benefits |  | Accumulated Other Comprehensive Income (Loss)
| (In Thousands)
Balance at December 31, 2023 | $ | (52,546) |  |  | $ | (1,581) |  |  | $ | 1,329 |  |  | $ | (52,798) |
Other comprehensive income (loss) | 13,242 |  |  | (977) |  |  | — |  |  | 12,265 |
Reclassification adjustment for (income) expense recognized in earnings | — |  |  | 2,452 |  |  | — |  |  | 2,452 |
Balance at September 30, 2024 | $ | (39,304) |  |  | $ | (106) |  |  | $ | 1,329 |  |  | $ | (38,081) |

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