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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Schedule of Changes in the Components of Other Comprehensive Income
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 
Schedule of Accumulated Balances for Each Component of Other Comprehensive Income, Net of Tax
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)