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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Changes in accumulated other comprehensive (loss) income by component, net of tax |  |  |  |
Beginning balance | $ 1,254,171 | $ 1,198,480 | $ 1,221,939 | $ 1,198,644
Other comprehensive income (loss) | 10,084 | 22,801 | 22,288 | 12,265
Reclassification adjustment for (income) expense recognized in earnings | 389 | 811 | 1,689 | 2,452
Ending balance | 2,414,996 | 1,230,362 | 2,414,996 | 1,230,362
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Changes in accumulated other comprehensive (loss) income by component, net of tax |  |  |  |
Beginning balance | (39,378) | (61,693) | (52,882) | (52,798)
Ending balance | (28,905) | (38,081) | (28,905) | (38,081)
Investment Securities Available-for-Sale |  |  |  |
Changes in accumulated other comprehensive (loss) income by component, net of tax |  |  |  |
Beginning balance | (39,654) | (59,733) | (53,718) | (52,546)
Other comprehensive income (loss) | 10,173 | 20,429 | 24,237 | 13,242
Reclassification adjustment for (income) expense recognized in earnings | 0 | 0 | 0 | 0
Ending balance | (29,481) | (39,304) | (29,481) | (39,304)
Net Change in Fair Value of Cash Flow Hedges |  |  |  |
Changes in accumulated other comprehensive (loss) income by component, net of tax |  |  |  |
Beginning balance | (436) | (3,289) | (1,323) | (1,581)
Other comprehensive income (loss) | (89) | 2,372 | 6 | (977)
Reclassification adjustment for (income) expense recognized in earnings | 389 | 811 | 1,181 | 2,452
Ending balance | (136) | (106) | (136) | (106)
Postretirement Benefits |  |  |  |
Changes in accumulated other comprehensive (loss) income by component, net of tax |  |  |  |
Beginning balance | 712 | 1,329 | 2,159 | 1,329
Other comprehensive income (loss) | 0 | 0 | (1,955) | 0
Reclassification adjustment for (income) expense recognized in earnings | 0 | 0 | 508 | 0
Ending balance | $ 712 | $ 1,329 | $ 712 | $ 1,329

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