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CHANGE IN ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Schedule of Components of Accumulated Other Comprehensive Loss Changes to accumulated other comprehensive loss by component are shown, net of taxes, in the following tables for the period indicated:
(Dollars in thousands)Net change in
investment
securities
available-for-sale		Net change
in investment securities
held-to-maturity		Net
change in
defined
benefit
plan		Net change in
fair value of
derivatives
used for cash
flow hedges		Net change in equity method investmentsTotal
Balance, June 30, 2025$(445,064)$(69,950)$(3,937)$(2,982)$(223)$(522,156)
Other comprehensive income (loss)44,395 — 7 (215)(21)44,166 
Amounts reclassified from accumulated other comprehensive loss— 3,370 (69)— — 3,301 
Net current-period other comprehensive income (loss)44,395 3,370 (62)(215)(21)47,467 
Balance, September 30, 2025$(400,669)$(66,580)$(3,999)$(3,197)$(244)$(474,689)
Balance, June 30, 2024$(549,039)$(84,046)$(4,790)$(5,423)$420 $(642,878)
Other comprehensive income (loss)128,223 — (4)10,722 4 138,945 
Amounts reclassified from accumulated other comprehensive loss— 3,965 (49)— — 3,916 
Net current-period other comprehensive income (loss)128,223 3,965 (53)10,722 4 142,861 
Balance, September 30, 2024$(420,816)$(80,081)$(4,843)$5,299 $424 $(500,017)
(Dollars in thousands)Net change in
investment
securities
available-for-sale		Net change
in investment securities
held-to-maturity		Net
change in
defined
benefit
plan		Net change in
fair value of
derivatives
used for cash
flow hedges		Net change in equity method investmentsTotal
Balance, December 31, 2024$(537,789)$(76,405)$(3,815)$(7,297)$429 $(624,877)
Other comprehensive income (loss)137,120 — 24 4,100 (673)140,571 
Amounts reclassified from accumulated other comprehensive loss— 9,825 (208)— — 9,617 
Net current-period other comprehensive income (loss)137,120 9,825 (184)4,100 (673)150,188 
Balance, September 30, 2025$(400,669)$(66,580)$(3,999)$(3,197)$(244)$(474,689)
Balance, December 31, 2023$(499,932)$(91,523)$(4,614)$1,597 $481 $(593,991)
Other comprehensive income (loss)79,116 — (81)3,702 (57)82,680 
Amounts reclassified from accumulated other comprehensive loss— 11,442 (148)— — 11,294 
Net current-period other comprehensive income (loss)79,116 11,442 (229)3,702 (57)93,974 
Balance, September 30, 2024$(420,816)$(80,081)$(4,843)$5,299 $424 $(500,017)
Schedule of Components of Other Comprehensive Income (Loss)
The unaudited Consolidated Statements of Income were impacted by components of other comprehensive income (loss) as shown in the tables below:
Three Months Ended September 30,Affected line item in unaudited Consolidated Statements of Income
(Dollars in thousands)20252024
Net unrealized holding losses on securities transferred between available-for-sale and held-to-maturity:
Amortization of net unrealized losses to income during the period4,433 5,217 Net interest income
Income taxes(1,063)(1,252)Income tax provision
Net of tax3,370 3,965 
Amortization of defined benefit pension plan-related items:
Prior service credits
(19)(19)
Actuarial gains(72)(46)
Total before tax(91)(65)Salaries, benefits and other compensation
Income taxes22 16 Income tax provision
Net of tax(69)(49)
Total reclassifications$3,301 $3,916 
 Nine Months Ended September 30,Affected line item in unaudited Consolidated Statements of Income
 20252024 
Net unrealized holding losses on securities transferred between available-for-sale and held-to-maturity:
Amortization of net unrealized losses to income during the period12,927 15,055 Net interest income
Income taxes(3,102)(3,613)Income tax provision
Net of tax9,825 11,442 
Amortization of defined benefit pension plan-related items:
Prior service credits
(57)(57)
Actuarial gains(217)(138)
Total before tax(274)(195)Salaries, benefits and other compensation
Income taxes66 47 Income tax provision
Net of tax(208)(148)
Total reclassifications$9,617 $11,294