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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
The following table summarizes the changes within each classification of AOCI, net of tax:
(dollars in thousands)Unrealized
Gains and
Losses on
Available-
for-Sale
Debt
Securities		Unrealized
Gains and
Losses on
Held-to-
Maturity
Securities		Gains and
Losses on
Hedges		Defined
Benefit
Pension
Plans		Total
Three Months Ended September 30, 2024     
Balance at beginning of period$(699,318)$(88,986)$(3,104)$— $(791,408)
Other comprehensive income (loss) before
   reclassifications		162,861 — 17,537 — 180,398 
Amounts reclassified from AOCI to income (1)
57 3,537 3,660 — 7,254 
Balance at end of period$(536,400)$(85,449)$18,093 $— $(603,756)
Three Months Ended September 30, 2023
Balance at beginning of period$(701,393)$(103,144)$(4,096)$— $(808,633)
Other comprehensive income (loss) before
   reclassifications		(156,660)— (11,546)— (168,206)
Amounts reclassified from AOCI to income (1)
178 4,193 3,653 — 8,024 
Balance at end of period$(857,875)$(98,951)$(11,989)$— $(968,815)
Nine Months Ended September 30, 2024
Balance at beginning of period$(652,518)$(95,472)$9,181 $— $(738,809)
Other comprehensive income (loss) before
   reclassifications		116,051 — (1,883)— 114,168 
Amounts reclassified from AOCI to income (1)
67 10,023 10,795 — 20,885 
Balance at end of period$(536,400)$(85,449)$18,093 $— $(603,756)
Nine Months Ended September 30, 2023
Balance at beginning of period$(642,346)$(112,664)$(31,549)$137 $(786,422)
Other comprehensive income (loss) before
   reclassifications		(219,562)1,325 34,279 — (183,958)
Amounts reclassified from AOCI to income (1)
4,033 12,388 (14,719)(137)1,565 
Balance at end of period$(857,875)$(98,951)$(11,989)$— $(968,815)
(1)See table below for details about reclassifications to income.
The following table summarizes the amounts reclassified out of each component of AOCI for the three months ended September 30, 2024 and 2023:
 Three Months Ended
September 30,		 
(dollars in thousands)20242023 
Details about AOCI ComponentsAmount Reclassified
from AOCI		Affected Line Item in the
Statement of Income
Unrealized gains and losses on
   available-for-sale securities		$(76)$(241)Debt securities gains (losses), net
 19 63 Income tax (expense) benefit
 $(57)$(178)Net income
Amortization of unrealized losses on
   held-to-maturity securities transferred
   from available-for-sale		$(4,740)$(5,623)Interest income (expense)
 1,203 1,430 Income tax (expense) benefit
 $(3,537)$(4,193)Net income
Gains and losses on hedges
   Interest rate contracts		$(4,936)$(4,927)Interest income (expense)
 1,276 1,274 Income tax (expense) benefit
 $(3,660)$(3,653)Net income
Total reclassifications for the period$(7,254)$(8,024)Net income
The following table summarizes the amounts reclassified out of each component of AOCI for the nine months ended September 30, 2024 and 2023:
 Nine Months Ended
September 30,		 
(dollars in thousands)20242023 
Details about AOCI ComponentsAmount Reclassified
from AOCI		Affected Line Item in the
Statement of Income
Unrealized gains and losses on
   available-for-sale securities		$(90)$(5,440)Debt securities gains (losses), net
 23 1,407 Income tax (expense) benefit
 $(67)$(4,033)Net income
Amortization of unrealized losses on
   held-to-maturity securities transferred
   from available-for-sale		$(13,434)$(16,574)Interest income (expense)
 3,411 4,186 Income tax (expense) benefit
 $(10,023)$(12,388)Net income
Gains and losses on hedges
   Interest rate contracts		$(14,560)$19,893 Interest income (expense)
 3,765 (5,174)Income tax (expense) benefit
 $(10,795)$14,719 Net income
Amortization of defined benefit
   pension items		 
Actuarial gains (losses)$— $182 Salaries and employee benefits
 — (45)Income tax (expense) benefit
 $— $137 Net income
Total reclassifications for the period$(20,885)$(1,565)Net income