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Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Other Comprehensive Income (Loss) Other Comprehensive Income (Loss)
(In Thousands)
Changes in the components of other comprehensive income (loss), net of tax, were as follows for the periods presented:
 
Pre-TaxTax Expense
(Benefit)		Net of Tax
Three months ended September 30, 2023
Securities available for sale:
Unrealized holding losses on securities$(17,175)$(4,292)$(12,883)
Amortization of unrealized holding losses on securities transferred to the held to maturity category3,959 1,012 2,947 
Total securities available for sale(13,216)(3,280)(9,936)
Derivative instruments:
Unrealized holding gains on derivative instruments2,670 683 1,987 
Total derivative instruments2,670 683 1,987 
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost116 30 86 
Total defined benefit pension and post-retirement benefit plans116 30 86 
Total other comprehensive loss$(10,430)$(2,567)$(7,863)
Three months ended September 30, 2022
Securities available for sale:
Unrealized holding losses on securities$(85,283)$(21,704)$(63,579)
Amortization of unrealized holding gains on securities transferred to the held to maturity category1,619 412 1,207 
Total securities available for sale(83,664)(21,292)(62,372)
Derivative instruments:
Unrealized holding gains on derivative instruments2,262 575 1,687 
Total derivative instruments2,262 575 1,687 
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost42 11 31 
Total defined benefit pension and post-retirement benefit plans42 11 31 
Total other comprehensive loss$(81,360)$(20,706)$(60,654)
Pre-TaxTax Expense
(Benefit)		Net of Tax
Nine months ended September 30, 2023
Securities available for sale:
Unrealized holding losses on securities$(17,744)$(4,462)$(13,282)
Reclassification adjustment for losses realized in net income22,438 5,622 16,816 
Amortization of unrealized holding losses on securities transferred to the held to maturity category10,113 2,586 7,527 
Total securities available for sale14,807 3,746 11,061 
Derivative instruments:
Unrealized holding losses on derivative instruments(2,153)(547)(1,606)
Total derivative instruments(2,153)(547)(1,606)
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost347 89 258 
Total defined benefit pension and post-retirement benefit plans347 89 258 
Total other comprehensive income$13,001 $3,288 $9,713 
Nine months ended September 30, 2022
Securities available for sale:
Unrealized holding losses on securities$(296,444)$(75,445)$(220,999)
Amortization of unrealized holding losses on securities transferred to the held to maturity category1,300 331 969 
Total securities available for sale(295,144)(75,114)(220,030)
Derivative instruments:
Unrealized holding gains on derivative instruments19,219 4,891 14,328 
Total derivative instruments19,219 4,891 14,328 
Defined benefit pension and post-retirement benefit plans:
Amortization of net actuarial loss recognized in net periodic pension cost125 32 93 
Total defined benefit pension and post-retirement benefit plans125 32 93 
Total other comprehensive loss$(275,800)$(70,191)$(205,609)

The accumulated balances for each component of other comprehensive loss, net of tax, were as follows as of the dates presented:
 
September 30,
2023		December 31, 2022
Unrealized losses on securities$(208,705)$(219,766)
Unrealized gains on derivative instruments17,350 18,956 
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations(7,969)(8,227)
Total accumulated other comprehensive loss$(199,324)$(209,037)