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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance |  |  | $ (74,416) |  |  |  | $ (74,416) |
Debt Securities, Available-for-sale, Realized Loss | $ 0 |  |  | $ 0 |  |  | 0 | $ (197)
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities | (1,992) |  |  | (2,147) |  |  | (5,978) | (6,329)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | (825) |  |  | 25,609 |  |  | 7,707 | (639)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 1,440 |  |  | 4,705 |  |  | 3,995 | 14,297
Labor and Related Expense | 135,703 |  |  | 121,036 |  |  | 386,593 | 362,012
Other Comprehensive Income (Loss), Net of Tax | (1,680) | $ 20,847 | 39,272 | 107,466 | $ (9,333) | $ (38,785) | 58,439 | 59,348
Ending Balance | (15,977) |  |  |  |  |  | (15,977) |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (6,109) |  | (48,993) | (176,139) |  | (148,641) | (48,993) | (148,641)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (5,178) |  |  | 90,858 |  |  | 47,970 | 49,844
Debt Securities, Available-for-sale, Realized Loss |  |  |  |  |  |  |  | 197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities | 1,992 |  |  | 2,147 |  |  | 5,978 | 6,329
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 0 |  |  | 0 |  |  | 0 | 0
Labor and Related Expense | 0 |  |  | 0 |  |  | 0 | 0
Other Expenses | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax | 795 |  |  | (23,198) |  |  | (13,456) | (14,060)
Other Comprehensive Income (Loss), Net of Tax | (2,392) |  |  | 69,807 |  |  | 40,492 | 42,309
Ending Balance | (8,501) | (6,109) |  | (106,332) | (176,139) |  | (8,501) | (106,332)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | 12,487 |  | (1,268) | (15,768) |  | 3,080 | (1,268) | 3,080
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 |  |  | 0 |  |  | 0 | 0
Debt Securities, Available-for-sale, Realized Loss |  |  |  |  |  |  |  | 0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | (825) |  |  | 25,609 |  |  | 7,707 | (639)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 1,440 |  |  | 4,705 |  |  | 3,995 | 14,297
Labor and Related Expense | 0 |  |  | 0 |  |  | 0 | 0
Other Expenses | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax | 148 |  |  | 7,405 |  |  | 2,816 | 5,213
Other Comprehensive Income (Loss), Net of Tax | 763 |  |  | 37,718 |  |  | 14,518 | 18,871
Ending Balance | 13,249 | 12,487 |  | 21,951 | (15,768) |  | 13,249 | 21,951
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (20,674) |  | (24,154) | (27,307) |  | (25,535) | (24,154) | (25,535)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 |  |  | 0 |  |  | 4,770 | 0
Debt Securities, Available-for-sale, Realized Loss |  |  |  |  |  |  |  | 0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 0 |  |  | 0 |  |  | 0 | 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 0 |  |  | 0 |  |  | 0 | 0
Labor and Related Expense | (63) |  |  | (73) |  |  | 189 | 217
Other Expenses | (4) |  |  | (7) |  |  | (12) | (21)
Other Comprehensive Income (Loss), Tax | 17 |  |  | 20 |  |  | (1,140) | (1,594)
Other Comprehensive Income (Loss), Net of Tax | (51) |  |  | (60) |  |  | 3,429 | (1,832)
Ending Balance | (20,725) | (20,674) |  | (27,367) | (27,307) |  | (20,725) | (27,367)
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (14,297) |  | (74,416) | (219,214) |  | (171,096) | (74,416) | (171,096)
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (5,178) |  |  | 90,858 |  |  | 52,741 | 49,844
Debt Securities, Available-for-sale, Realized Loss |  |  |  |  |  |  |  | 197
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities | 1,992 |  |  | 2,147 |  |  | 5,978 | 6,329
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | (825) |  |  | 25,609 |  |  | 7,707 | (639)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax | 1,440 |  |  | 4,705 |  |  | 3,995 | 14,297
Labor and Related Expense | (63) |  |  | (73) |  |  | 189 | 217
Other Expenses | (4) |  |  | (7) |  |  | (12) | (21)
Other Comprehensive Income (Loss), Tax | 960 |  |  | (15,773) |  |  | (11,780) | (10,440)
Other Comprehensive Income (Loss), Net of Tax | (1,680) | 20,847 | $ 39,272 | 107,466 | (9,333) | $ (38,785) | 58,439 | 59,348
Ending Balance | $ (15,977) | $ (14,297) |  | $ (111,748) | $ (219,214) |  | $ (15,977) | $ (111,748)

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