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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Schedule of AOCI
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 March 31, 2024
Balance at beginning of period$(652,518)$(95,472)$9,181 $— $(738,809)
Other comprehensive income (loss) before
   reclassifications		(33,463)— (14,205)— (47,668)
Amounts reclassified from AOCI to income (1)
12 3,221 3,616 — 6,849 
Balance at end of period$(685,969)$(92,251)$(1,408)$— $(779,628)
Three Months Ended March 31, 2023
Balance at beginning of period$(642,346)$(112,664)$(31,549)$137 $(786,422)
Other comprehensive income (loss) before
   reclassifications		27,219 1,325 35,985 — 64,529 
Amounts reclassified from AOCI to income (1)
3,867 4,373 5,436 (141)13,535 
Balance at end of period$(611,260)$(106,966)$9,872 $(4)$(708,358)
(1)See table below for details about reclassifications to income.
Schedule of Reclassifications out of AOCI
The following table summarizes the amounts reclassified out of each component of AOCI for the three months ended March 31, 2024 and 2023:
 Three Months Ended
March 31,		 
(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		$(16)$(5,216)Debt securities gains (losses), net
 4 1,349 Income tax (expense) benefit
 $(12)$(3,867)Net income
Amortization of unrealized losses on
   held-to-maturity securities transferred
   from available-for-sale		$(4,318)$(5,829)Interest income (expense)
 1,097 1,456 Income tax (expense) benefit
 $(3,221)$(4,373)Net income
Gains and losses on hedges
   Interest rate contracts		$(4,877)$(7,292)Interest income (expense)
 1,261 1,856 Income tax (expense) benefit
 $(3,616)$(5,436)Net income
Amortization of defined benefit
   pension items		 
Actuarial gains (losses)$— $188 Salaries and employee benefits
 — (47)Income tax (expense) benefit
 $— $141 Net income
Total reclassifications for the period$(6,849)$(13,535)Net income