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Other Comprehensive Income
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Other Comprehensive Income Other Comprehensive Income
(In Thousands)
Changes in the components of other comprehensive income, net of tax, were as follows for the periods presented:
 
Pre-TaxTax Expense
(Benefit)		Net of Tax
Three months ended September 30, 2025
Securities available for sale:
Unrealized holding gains on securities$15,440 $3,855 $11,585 
Amortization of unrealized holding losses on securities transferred to the held to maturity category3,005 768 2,237 
Total securities available for sale18,445 4,623 13,822 
Derivative instruments:
Unrealized holding losses on derivative instruments(1,376)(350)(1,026)
Total derivative instruments(1,376)(350)(1,026)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost99 24 75 
Total defined benefit pension and post-retirement benefit plans99 24 75 
Total other comprehensive income$17,168 $4,297 $12,871 
Three months ended September 30, 2024
Securities available for sale:
Unrealized holding gains on securities$31,313 $7,872 $23,441 
Amortization of unrealized holding losses on securities transferred to the held to maturity category3,131 800 2,331 
Total securities available for sale34,444 8,672 25,772 
Derivative instruments:
Unrealized holding losses on derivative instruments(1,116)(288)(828)
Total derivative instruments(1,116)(288)(828)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost106 28 78 
Total defined benefit pension and post-retirement benefit plans106 28 78 
Total other comprehensive income$33,434 $8,412 $25,022 
Pre-TaxTax Expense
(Benefit)		Net of Tax
Nine months ended September 30, 2025
Securities available for sale:
Unrealized holding gains on securities$51,167 $12,854 $38,313 
Amortization of unrealized holding losses on securities transferred to the held to maturity category8,889 2,274 6,615 
Total securities available for sale60,056 15,128 44,928 
Derivative instruments:
Unrealized holding losses on derivative instruments(4,988)(1,275)(3,713)
Total derivative instruments(4,988)(1,275)(3,713)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost298 75 223 
Total defined benefit pension and post-retirement benefit plans298 75 223 
Total other comprehensive income$55,366 $13,928 $41,438 
Nine months ended September 30, 2024
Securities available for sale:
Unrealized holding losses on securities$25,769 $6,494 $19,275 
Amortization of unrealized holding losses on securities transferred to the held to maturity category9,658 2,468 7,190 
Total securities available for sale35,427 8,962 26,465 
Derivative instruments:
Unrealized holding losses on derivative instruments(2,069)(530)(1,539)
Total derivative instruments(2,069)(530)(1,539)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost317 81 236 
Total defined benefit pension and post-retirement benefit plans317 81 236 
Total other comprehensive income$33,675 $8,513 $25,162 

The accumulated balances for each component of other comprehensive loss, net of tax, were as follows as of the dates presented:
 
September 30,
2025		December 31, 2024
Unrealized losses on securities$(108,006)$(152,934)
Unrealized gains on derivative instruments13,716 17,429 
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations(6,880)(7,103)
Total accumulated other comprehensive loss$(101,170)$(142,608)