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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Changes in the components of other comprehensive income (loss) Changes in the components of other comprehensive income (loss), net of tax, were as follows:
Pre-TaxTax  Expense
(Benefit)		Net of Tax
Year Ended December 31, 2022
Securities available for sale:
Unrealized holding losses on securities$(285,829)$(71,478)$(214,351)
Amortization of unrealized holding losses on securities transferred to the held to maturity category4,964 1,263 3,701 
Total securities available for sale(280,865)(70,215)(210,650)
Derivative instruments:
Unrealized holding gains on derivative instruments20,118 5,125 14,993 
Total derivative instruments20,118 5,125 14,993 
Defined benefit pension and post-retirement benefit plans:
Net loss arising during the period(4,107)(1,045)(3,062)
Amortization of net actuarial loss recognized in net periodic pension cost(2)
167 42 125 
Total defined benefit pension and post-retirement benefit plans(3,940)(1,003)(2,937)
Total other comprehensive loss$(264,687)$(66,093)$(198,594)
Year Ended December 31, 2021
Securities available for sale:
Unrealized holding losses on securities$(51,470)$(13,099)$(38,371)
Reclassification adjustment for gains realized in net income(1)
(2,170)(552)(1,618)
Amortization of unrealized holding gains on securities transferred to the held to maturity category(73)(19)(54)
Total securities available for sale(53,713)(13,670)(40,043)
Derivative instruments:
Unrealized holding gains on derivative instruments10,848 2,761 8,087 
Reclassification adjustment for gains realized in net income related to swap termination(4,676)(1,190)(3,486)
Total derivative instruments6,172 1,571 4,601 
Defined benefit pension and post-retirement benefit plans:
Net loss arising during the period(356)(92)(264)
Amortization of net actuarial loss recognized in net periodic pension cost(2)
262 67 195 
Total defined benefit pension and post-retirement benefit plans(94)(25)(69)
Total other comprehensive loss$(47,635)$(12,124)$(35,511)
 Pre-TaxTax  Expense
(Benefit)		Net of Tax
Year Ended December 31, 2020
Securities available for sale:
Unrealized holding gains on securities$27,788 $7,071 $20,717 
Reclassification adjustment for gains realized in net income(1)
(46)(12)(34)
Total securities available for sale27,742 7,059 20,683 
Derivative instruments:
Unrealized holding gains on derivative instruments923 235 688 
Reclassification adjustment for losses realized in net income related to swap termination2,040 519 1,521 
Total derivative instruments2,963 754 2,209 
Defined benefit pension and post-retirement benefit plans:
Net gain arising during the period1,069 272 797 
Reclassification adjustment for settlement loss related to the VERP realized in net income(3)
567 145 422 
New prior service cost(3)
(485)(123)(362)
Amortization of net actuarial loss recognized in net periodic pension cost(2)
259 66 193 
Amortization of prior service cost(3)
485 123 362 
Total defined benefit pension and post-retirement benefit plans1,895 483 1,412 
Total other comprehensive income$32,600 $8,296 $24,304 
(1) Included in Net gains (losses) on sales of securities in the Consolidated Statements of Income
(2) Included in Salaries and employee benefits in the Consolidated Statements of Income
(3) Included in Restructuring charges in the Consolidated Statements of Income
Accumulated balances for each component of other comprehensive income, net of tax The accumulated balances for each component of other comprehensive income (loss), net of tax, at December 31 were as follows:
 202220212020
Unrealized (losses) gains on securities$(219,766)$(9,116)$42,246 
Non-credit related portion of other-than-temporary impairment on securities— — (11,319)
Unrealized gains (losses) on derivative instruments18,956 3,963 (638)
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations(8,227)(5,290)(5,221)
Total accumulated other comprehensive (loss) income$(209,037)$(10,443)$25,068