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Other Comprehensive Income
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Other Comprehensive Income OTHER COMPREHENSIVE INCOME (Note 19)
The following table presents the tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2022, 2021 and 2020. Components of other comprehensive income (loss) include changes in net unrealized gains and losses on debt securities available for sale; 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. 
 202220212020
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 (AFS) debt securities
Net (losses) gains arising during the period$(189,201)$52,220 $(136,981)$(32,586)$8,973 $(23,613)$38,477 $(10,632)$27,845 
Less reclassification adjustment for net (gains) losses included in net income (1)
(31)8 (23)(663)172 (491)(524)147 (377)
Net change
(189,232)52,228 (137,004)(33,249)9,145 (24,104)37,953 (10,485)27,468 
Unrealized gains and losses on derivatives (cash flow hedges)
Net gains (losses) arising during the period4,683 (1,321)3,362 138 (11)127 (3,169)918 (2,251)
Less reclassification adjustment for net losses (gains) included in net income (2)
274 (71)203 3,436 (989)2,447 2,912 (838)2,074 
Net change
4,957 (1,392)3,565 3,574 (1,000)2,574 (257)80 (177)
Defined benefit pension and postretirement benefit plans
Net (losses) gains arising during the period(18,531)5,356 (13,175)14,381 (4,075)10,306 (5,719)2,301 (3,418)
Amortization of prior service (cost) credit (3)
(135)35 (100)(135)39 (96)(136)38 (98)
Amortization of net loss (3)
905 (261)644 1,538 (432)1,106 1,003 (282)721 
Net change
(17,761)5,130 (12,631)15,784 (4,468)11,316 (4,852)2,057 (2,795)
Total other comprehensive (loss) income$(202,036)$55,966 $(146,070)$(13,891)$3,677 $(10,214)$32,844 $(8,348)$24,496 
(1)    Included in (losses) gains on securities transactions, net.
(2)     Included in interest expense.
(3)     Included in the computation of net periodic pension cost. See Note 12 for details.
The following table presents the after-tax changes in the balances of each component of accumulated other comprehensive loss for the years ended December 31, 2022, 2021 and 2020: 
 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, 2019$5,822 $(3,729)$(34,307)$(32,214)
Other comprehensive income (loss) before reclassifications27,845 (2,251)(3,418)22,176 
Amounts reclassified from other comprehensive (loss) income (377)2,074 623 2,320 
Other comprehensive income (loss), net27,468 (177)(2,795)24,496 
Balance-December 31, 202033,290 (3,906)(37,102)(7,718)
Other comprehensive (loss) income before reclassifications(23,613)127 10,306 (13,180)
Amounts reclassified from other comprehensive (loss) income(491)2,447 1,010 2,966 
Other comprehensive (loss) income, net(24,104)2,574 11,316 (10,214)
Balance-December 31, 20219,186 (1,332)(25,786)(17,932)
Other comprehensive (loss) income before reclassifications(136,981)3,362 (13,175)(146,794)
Amounts reclassified from other comprehensive (loss) income(23)203 544 724 
Other comprehensive (loss) income, net(137,004)3,565 (12,631)(146,070)
Balance-December 31, 2022$(127,818)$2,233 $(38,417)$(164,002)