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Comprehensive Income/Loss (Tables)
6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Comprehensive income
The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
Three Months Ended
June 30, 2023
Six Months Ended
June 30, 2023
Pre-Tax
Amount
Tax (Expense)
Benefit
After Tax
Amount
Pre-Tax
Amount
Tax (Expense)
Benefit
After Tax
Amount
 (Dollars in thousands)
Change in fair value of securities available for sale$(14,993)$3,542 $(11,451)$7,192 $(1,575)$5,617 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale(14,993)3,542 (11,451)7,192 (1,575)5,617 
Change in fair value of cash flow hedges(14,599)4,105 (10,494)(6,700)1,884 (4,816)
Less: net cash flow hedge losses reclassified into interest income or interest expense (7,020)1,974 (5,046)(13,259)3,728 (9,531)
Net change in fair value of cash flow hedges(7,579)2,131 (5,448)6,559 (1,844)4,715 
Amortization of net actuarial gains(137)39 (98)(274)77 (197)
Amortization of net prior service costs(2)19 (5)14 
Net change in other comprehensive income for defined benefit postretirement plans (1)(128)37 (91)(255)72 (183)
Total other comprehensive (loss) income$(22,700)$5,710 $(16,990)$13,496 $(3,347)$10,149 
 Three Months Ended
June 30, 2022
Six Months Ended
June 30, 2022
 Pre-Tax
Amount
Tax (Expense)
Benefit
After Tax
Amount
Pre-Tax
Amount
Tax (Expense)
Benefit
After Tax
Amount
 (Dollars in thousands)
Change in fair value of securities available for sale$(30,734)$7,000 $(23,734)$(112,353)$26,063 $(86,290)
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale(30,734)7,000 (23,734)(112,353)26,063 (86,290)
Change in fair value of cash flow hedges(7,126)2,004 (5,122)(27,606)7,772 (19,834)
Less: net cash flow hedge gains reclassified into interest income or interest expense 3,515 (988)2,527 8,020 (2,255)5,765 
Net change in fair value of cash flow hedges(10,641)2,992 (7,649)(35,626)10,027 (25,599)
Amortization of net actuarial losses158 (44)114 317 (89)228 
Amortization of net prior service costs(2)19 (5)14 
Net change in other comprehensive income for defined benefit postretirement plans (1)167 (46)121 336 (94)242 
Total other comprehensive loss$(41,208)$9,946 $(31,262)$(147,643)$35,996 $(111,647)

(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 13 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2022 Form 10-K.
Company's accumulated other comprehensive loss, net of tax
Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated:
Unrealized Gain (Loss)
on Securities
Unrealized Gain (Loss) on Cash Flow HedgeDefined Benefit Postretirement PlansAccumulated Other Comprehensive Income (Loss)
(Dollars in thousands)
2023
Beginning balance: January 1, 2023$(128,657)$(36,630)$2,203 $(163,084)
Net change in other comprehensive income (loss)5,617 4,715 (183)10,149 
Ending balance: June 30, 2023$(123,040)$(31,915)$2,020 $(152,935)
 2022
Beginning balance: January 1, 2022$(9,667)$14,137 $(2,287)$2,183 
Net change in other comprehensive income (loss)(86,290)(25,599)242 (111,647)
Ending balance: June 30, 2022$(95,957)$(11,462)$(2,045)$(109,464)