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Comprehensive Income/Loss (Tables)
 6 Months Ended
Jun. 30, 2025
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, 2025		Six Months Ended
June 30, 2025
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$12,743 $(2,908)$9,835 $34,007 $(7,778)$26,229 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale12,743 (2,908)9,835 34,007 (7,778)26,229 
Change in fair value of cash flow hedges697 (191)506 2,786 (763)2,023 
Less: net cash flow hedge losses reclassified into interest income or interest expense (2,509)686 (1,823)(5,179)1,417 (3,762)
Net change in fair value of cash flow hedges3,206 (877)2,329 7,965 (2,180)5,785 
Amortization of net actuarial gains(67)18 (49)(133)36 (97)
Amortization of net prior service costs5 (1)4 9 (2)7 
Net change in other comprehensive income for defined benefit postretirement plans (1)(62)17 (45)(124)34 (90)
Total other comprehensive income $15,887 $(3,768)$12,119 $41,848 $(9,924)$31,924 
 Three Months Ended
June 30, 2024		Six Months Ended
June 30, 2024
 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$5,358 $(1,966)$3,392 $1,406 $(1,022)$384 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale5,358 (1,966)3,392 1,406 (1,022)384 
Change in fair value of cash flow hedges(2,642)722 (1,920)(10,546)2,883 (7,663)
Less: net cash flow hedge losses reclassified into interest income or interest expense (5,030)1,375 (3,655)(10,886)2,976 (7,910)
Net change in fair value of cash flow hedges2,388 (653)1,735 340 (93)247 
Amortization of net actuarial gains(25)7 (18)(50)14 (36)
Amortization of net prior service costs5 (1)4 9 (2)7 
Net change in other comprehensive income for defined benefit postretirement plans (1)(20)6 (14)(41)12 (29)
Total other comprehensive income$7,726 $(2,613)$5,113 $1,705 $(1,103)$602 

(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 12 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements included in Item 8 of the Company’s 2024 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)
2025
Beginning balance: January 1, 2025$(79,488)$(13,862)$3,343 $(90,007)
Net change in other comprehensive income (loss)26,229 5,785 (90)31,924 
Ending balance: June 30, 2025$(53,259)$(8,077)$3,253 $(58,083)
 2024
Beginning balance: January 1, 2024$(96,231)$(20,575)$1,979 $(114,827)
Net change in other comprehensive income (loss)384 247 (29)602 
Ending balance: June 30, 2024$(95,847)$(20,328)$1,950 $(114,225)