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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | $ (254,806) | $ (308,030)
Unrealized Loss on Securities Available for Sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | (331,538) | (400,720)
Deferred tax asset | 76,751 | 92,767
Total accumulated other comprehensive income (loss) | (254,787) | (307,953)
Postretirement Plans Asset (Liability) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | (25) | (100)
Deferred tax asset | 6 | 23
Total accumulated other comprehensive income (loss) | $ (19) | $ (77)

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