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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Amount Before Tax |  |  |
Total | $ 281,999 | $ (8,402) | $ 184,138
Tax Benefit (Expense) |  |  |
Total | (76,460) | 2,590 | (49,749)
Amount Net of Tax |  |  |
Net unrealized gain arising during the year | 197,377 | (141,496) | 97,565
Reclassification adjustment for net realized gains (losses) included in net income | 8,162 | 135,684 | 36,824
Total | 205,539 | (5,812) | 134,389
Investment Securities Available- for-Sale |  |  |
Amount Before Tax |  |  |
Net unrealized gain arising during the year | 255,998 | (145,673) | 124,233
Reclassification adjustment for net realized gains (losses) included in net income | (528) | 141,418 | 31,533
Total | 255,470 | (4,255) | 155,766
Tax Benefit (Expense) |  |  |
Net unrealized gain arising during the year | (69,408) | 39,226 | (33,579)
Reclassification adjustment for net realized gains (losses) included in net income | 143 | (37,839) | (8,477)
Total | (69,265) | 1,387 | (42,056)
Amount Net of Tax |  |  |
Net unrealized gain arising during the year | 186,590 | (106,447) | 90,654
Reclassification adjustment for net realized gains (losses) included in net income | (385) | 103,579 | 23,056
Total | 186,205 | (2,868) | 113,710
Derivative Financial Instruments |  |  |
Amount Before Tax |  |  |
Net unrealized gain arising during the year | 8,099 | (51,383) | (6,701)
Reclassification adjustment for net realized gains (losses) included in net income | 10,207 | 42,039 | 14,938
Total | 18,306 | (9,344) | 8,237
Tax Benefit (Expense) |  |  |
Net unrealized gain arising during the year | (2,197) | 13,937 | 1,818
Reclassification adjustment for net realized gains (losses) included in net income | (2,768) | (11,324) | (4,050)
Total | (4,965) | 2,613 | (2,232)
Amount Net of Tax |  |  |
Net unrealized gain arising during the year | 5,902 | (37,446) | (4,883)
Reclassification adjustment for net realized gains (losses) included in net income | 7,439 | 30,715 | 10,888
Total | 13,341 | (6,731) | 6,005
Defined Benefit Pension and Other Postretirement Benefit Plans |  |  |
Amount Before Tax |  |  |
Net unrealized gain arising during the year | 6,703 | 3,290 | 16,183
Reclassification adjustment for net realized gains (losses) included in net income | 1,520 | 1,907 | 3,952
Total | 8,223 | 5,197 | 20,135
Tax Benefit (Expense) |  |  |
Net unrealized gain arising during the year | (1,818) | (893) | (4,389)
Reclassification adjustment for net realized gains (losses) included in net income | (412) | (517) | (1,072)
Total | (2,230) | (1,410) | (5,461)
Amount Net of Tax |  |  |
Net unrealized gain arising during the year | 4,885 | 2,397 | 11,794
Reclassification adjustment for net realized gains (losses) included in net income | 1,108 | 1,390 | 2,880
Total | $ 5,993 | $ 3,787 | $ 14,674

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