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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) For the three and nine months ended September 30, 2025 and 2024, the Company’s accumulated OCI (loss) includes the following three components: (i) unrealized holding gains (losses) on investment securities available-for-sale; (ii) change in the fair value of cash flow hedges; and (iii) adjustment of accumulated obligation for postretirement benefits. 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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