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Other Comprehensive Income (Loss) - Schedule of Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Before-Tax Amount |  |
Net unrealized gains/losses / Other comprehensive (loss) income | $ (9,391) | $ 21,709
Tax (Expense) Benefit |  |
Other Comprehensive Income, Net unrealized loss | 2,347 | (5,427)
Net of Tax |  |
Other comprehensive gain (loss), before reclassifications | (7,162) | 16,117
Reclassification adjustment | 118 | 165
Other comprehensive income (loss) | (7,044) | 16,282
Available-for-sale securities |  |
Before-Tax Amount |  |
Change in net unrealized (loss) gain during the period | (9,549) | 21,489
Net unrealized gains/losses / Other comprehensive (loss) income | (9,549) | 21,489
Tax (Expense) Benefit |  |
Change in net unrealized (loss) gain during the period | 2,387 | (5,372)
Other Comprehensive Income, Net unrealized loss | 2,387 | (5,372)
Net of Tax |  |
Other comprehensive gain (loss), before reclassifications | (7,162) | 16,117
Other comprehensive income (loss) | (7,162) | 16,117
Amortization of net retirement plan actuarial gain (loss) |  |
Before-Tax Amount |  |
Reclassification adjustment | 109 | 171
Tax (Expense) Benefit |  |
Reclassification adjustment | (27) | (43)
Net of Tax |  |
Reclassification adjustment | 82 | 128
Amortization of net retirement plan prior service cost |  |
Before-Tax Amount |  |
Reclassification adjustment | 49 | 49
Tax (Expense) Benefit |  |
Reclassification adjustment | (13) | (12)
Net of Tax |  |
Reclassification adjustment | 36 | 37
Employee benefit plans |  |
Before-Tax Amount |  |
Net unrealized gains/losses / Other comprehensive (loss) income | 158 | 220
Tax (Expense) Benefit |  |
Other Comprehensive Income, Net unrealized loss | (40) | (55)
Net of Tax |  |
Other comprehensive income (loss) | $ 118 | $ 165

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