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Comprehensive Income/Loss (Tables)
9 Months Ended
Sep. 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
September 30, 2025
Nine Months Ended
September 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$11,822 $(2,703)$9,119 $45,829 $(10,481)$35,348 
Less: net security losses reclassified into other non-interest expense(64)14 (50)(64)14 (50)
Net change in fair value of securities available for sale11,886 (2,717)9,169 45,893 (10,495)35,398 
Change in fair value of cash flow hedges(347)95 (252)2,439 (668)1,771 
Less: net cash flow hedge losses reclassified into interest income or interest expense (2,271)622 (1,649)(7,450)2,039 (5,411)
Net change in fair value of cash flow hedges1,924 (527)1,397 9,889 (2,707)7,182 
Amortization of net actuarial gains(66)18 (48)(199)54 (145)
Amortization of net prior service costs(1)13 (3)10 
Net change in other comprehensive income for defined benefit postretirement plans (1)(62)17 (45)(186)51 (135)
Total other comprehensive income $13,748 $(3,227)$10,521 $55,596 $(13,151)$42,445 
 Three Months Ended
September 30, 2024
Nine Months Ended
September 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$36,678 $(8,392)$28,286 $38,084 $(9,414)$28,670 
Less: net security losses reclassified into other non-interest expense— — — — — — 
Net change in fair value of securities available for sale36,678 (8,392)28,286 38,084 (9,414)28,670 
Change in fair value of cash flow hedges7,144 (1,953)5,191 (3,402)930 (2,472)
Less: net cash flow hedge losses reclassified into interest income or interest expense (4,902)1,340 (3,562)(15,788)4,316 (11,472)
Net change in fair value of cash flow hedges12,046 (3,293)8,753 12,386 (3,386)9,000 
Amortization of net actuarial gains(24)(18)(74)20 (54)
Amortization of net prior service costs(2)13 (4)
Net change in other comprehensive income for defined benefit postretirement plans (1)(20)(16)(61)16 (45)
Total other comprehensive income$48,704 $(11,681)$37,023 $50,409 $(12,784)$37,625 

(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 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 $(90,007)
Net change in other comprehensive income (loss)35,398 7,182 (135)42,445 
Ending balance: September 30, 2025$(44,090)$(6,680)$3,208 $(47,562)
 2024
Beginning balance: January 1, 2024$(96,231)$(20,575)$1,979 $(114,827)
Net change in other comprehensive income (loss)28,670 9,000 (45)37,625 
Ending balance: September 30, 2024$(67,561)$(11,575)$1,934 $(77,202)