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Other Comprehensive Income
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Other Comprehensive Income
OTHER COMPREHENSIVE INCOME (Note 18)
The following table presents the tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2025, 2024 and 2023. Components of other comprehensive income (loss) include changes in net unrealized gains and losses on debt securities AFS; unrealized gains and losses on derivatives used in cash flow hedging relationships; and the defined benefit pension and postretirement benefit plan adjustments for the unfunded portion of various employee, officer and director benefit plans.
 202520242023
Before
Tax		Tax
Effect		After
Tax		Before
Tax		Tax
Effect		After
Tax		Before
Tax		Tax
Effect		After
Tax
 (in thousands)
Unrealized gains and losses on available for sale debt securities
Net gains (losses) arising during the period$94,126 $(24,780)$69,346 $(24,687)$6,290 $(18,397)$19,514 $(6,564)$12,950 
Amounts reclassified to earnings (1)
(1)— (1)1 — 1 (863)229 (634)
Net change
94,125 (24,780)69,345 (24,686)6,290 (18,396)18,651 (6,335)12,316 
Unrealized gains and losses on derivatives (cash flow hedges)
Net losses arising during the period— — — — — — (1,093)336 (757)
Amounts reclassified to earnings (2)
(1,136)311 (825)(1,204)335 (869)891 (253)638 
Net change
(1,136)311 (825)(1,204)335 (869)(202)83 (119)
Defined benefit pension and postretirement benefit plans
Net gains arising during the period17,716 (4,834)12,882 14,725 (4,116)10,609 8,035 (2,593)5,442 
Amortization of prior service cost (3)
(135)36 (99)(135)38 (97)(135)45 (90)
Amortization of net loss (3)
(479)131 (348)(174)49 (125)(4)1 (3)
Net change
17,102 (4,667)12,435 14,416 (4,029)10,387 7,896 (2,547)5,349 
Total other comprehensive income (loss)$110,091 $(29,136)$80,955 $(11,474)$2,596 $(8,878)$26,345 $(8,799)$17,546 
(1)    Included in gains on securities transactions, net.
(2)     Included in interest and fees on loans.
(3)     Included in other non-interest expense. See Note 11 for details.
The following table presents the after-tax changes in the balances of each component of accumulated other comprehensive (loss) income for the years ended December 31, 2025, 2024 and 2023:
 Components of Accumulated Other Comprehensive LossTotal
Accumulated
Other
Comprehensive
Loss
 Unrealized Gains
and Losses on AFS Securities		Unrealized Gains
and Losses on
Derivatives		Defined benefit pension and postretirement benefit plans
 (in thousands)
Balance-December 31, 2022$(127,818)$2,233 $(38,417)$(164,002)
Other comprehensive income (loss) before reclassifications12,950 (757)5,442 17,635 
Amounts reclassified to earnings(634)638 (93)(89)
Other comprehensive income (loss), net12,316 (119)5,349 17,546 
Balance-December 31, 2023(115,502)2,114 (33,068)(146,456)
Other comprehensive (loss) income before reclassifications(18,397)— 10,609 (7,788)
Amounts reclassified to earnings1 (869)(222)(1,090)
Other comprehensive (loss) income, net(18,396)(869)10,387 (8,878)
Balance-December 31, 2024(133,898)1,245 (22,681)(155,334)
Other comprehensive income (loss) before reclassifications69,346 — 12,882 82,228 
Amounts reclassified to earnings(1)(825)(447)(1,273)
Other comprehensive income (loss) , net69,345 (825)12,435 80,955 
Balance-December 31, 2025$(64,553)$420 $(10,246)$(74,379)