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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of 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
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | $ 15,124 | $ 45,655 | $ 46,293 | $ 31,529
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses and Other comprehensive income (loss) | (3,782) | (11,185) | (11,574) | (7,724)
Net of Tax |  |  |  |
Change in net unrealized (loss) gain during the period | 11,235 | 34,300 | 34,396 | 23,221
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 107 | 170 | 323 | 584
Other comprehensive income (loss) | 11,342 | 34,470 | 34,719 | 23,805
Net unrealized gains/losses |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized (loss) gain during the period | 14,980 | 45,431 | 45,861 | 30,756
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 0 | (50) | 0 | (50)
Net unrealized gains/losses | 14,980 | 45,381 | 45,861 | 30,706
Tax (Expense) Benefit |  |  |  |
Change in net unrealized (loss) gain during the period | (3,745) | (11,131) | (11,465) | (7,535)
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 0 | 12 | 0 | 12
Net unrealized gains/losses and Other comprehensive income (loss) | (3,745) | (11,119) | (11,465) | (7,523)
Net of Tax |  |  |  |
Change in net unrealized (loss) gain during the period | 11,235 | 34,300 | 34,396 | 23,221
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 0 | (38) | 0 | (38)
Other comprehensive income (loss) | 11,235 | 34,262 | 34,396 | 23,183
Amortization of net retirement plan actuarial gain (loss) |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 95 | 229 | 285 | 686
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | (24) | (56) | (72) | (168)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 71 | 173 | 213 | 518
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 49 | 45 | 147 | 137
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | (13) | (10) | (37) | (33)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) | 36 | 35 | 110 | 104
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | 144 | 274 | 432 | 823
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses and Other comprehensive income (loss) | (37) | (66) | (109) | (201)
Net of Tax |  |  |  |
Other comprehensive income (loss) | $ 107 | $ 208 | $ 323 | $ 622

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