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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | $ (400,752) | $ (341,975)
Unrealized Loss on Securities Available for Sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | (521,660) | (444,063)
Deferred tax asset | 120,765 | 102,046
Total accumulated other comprehensive income (loss) | (400,895) | (342,017)
Postretirement Plans Asset (Liability) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total accumulated other comprehensive income (loss) | 187 | 54
Deferred tax asset | (44) | (12)
Total accumulated other comprehensive income (loss) | $ 143 | $ 42

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