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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2022
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
Cash Flow
Hedges		Defined
Benefit
Pension
Plans		Total
Three Months Ended September 30, 2022     
Balance at beginning of period$(437,075)$(122,199)$(9,875)$16 $(569,133)
Other comprehensive income (loss) before
   reclassifications		(217,401)— (27,725)— (245,126)
Amounts reclassified from AOCI to income (1)
131 5,121 565 (8)5,809 
Balance at end of period$(654,345)$(117,078)$(37,035)$8 $(808,450)
Three Months Ended September 30, 2021
Balance at beginning of period$59,095 $— $3,241 $(74)$62,262 
Other comprehensive income (loss) before
   reclassifications		(3,230)— (124)— (3,354)
Amounts reclassified from AOCI to income (1)
(945)— (1,190)37 (2,098)
Balance at end of period$54,920 $— $1,927 $(37)$56,810 
Nine Months Ended September 30, 2022
Balance at beginning of period$(2,950)$— $543 $32 $(2,375)
Other comprehensive income (loss) before
   reclassifications		(651,330)(125,229)(37,473)— (814,032)
Amounts reclassified from AOCI to income (1)
(65)8,151 (105)(24)7,957 
Balance at end of period$(654,345)$(117,078)$(37,035)$8 $(808,450)
Nine Months Ended September 30, 2021
Balance at beginning of period$145,335 $— $2,584 $(148)$147,771 
Other comprehensive income (loss) before
   reclassifications		(87,403)— 1,970 — (85,433)
Amounts reclassified from AOCI to income (1)
(3,012)— (2,627)111 (5,528)
Balance at end of period$54,920 $— $1,927 $(37)$56,810 
(1)See tables below for details about reclassifications to income.
The following table summarizes the significant amounts reclassified out of each component of AOCI for the three months ended September 30, 2022 and 2021:
 Three Months Ended
September 30,		 
(dollars in thousands)20222021 
Details about AOCI ComponentsAmount Reclassified
from AOCI		Affected Line Item in the
Statement of Income
Unrealized gains and losses on
   available-for-sale securities		$(172)$1,207 Debt securities gains (losses), net
 41 (262)Income tax (expense) benefit
 $(131)$945 Net income
Unrealized gains and losses on
   held-to-maturity securities		$(6,772)$— Interest income (expense)
 1,651 — Income tax (expense) benefit
 $(5,121)$— Net income
Gains and losses on cash flow hedges
   Interest rate contracts		$(749)$1,578 Interest income (expense)
 184 (388)Income tax (expense) benefit
 $(565)$1,190 Net income
Amortization of defined benefit
   pension items		 
Actuarial gains (losses)$11 $(49)Salaries and employee benefits
 (3)12 Income tax (expense) benefit
 $8 $(37)Net income
Total reclassifications for the period$(5,809)$2,098 Net income
The following table summarizes the significant amounts reclassified out of each component of AOCI for the nine months ended September 30, 2022 and 2021:
 Nine Months Ended
September 30,		 
(dollars in thousands)20222021 
Details about AOCI ComponentsAmount Reclassified
from AOCI		Affected Line Item in the
Statement of Income
Unrealized gains and losses on
   available-for-sale securities		$85 $3,892 Debt securities gains (losses), net
 (20)(880)Income tax (expense) benefit
 $65 $3,012 Net income
Unrealized gains and losses on
   held-to-maturity securities		$(10,774)$— Interest income (expense)
 2,623 — Income tax (expense) benefit
 $(8,151)$— Net income
Gains and losses on cash flow hedges
   Interest rate contracts		$139 $3,483 Interest income (expense)
 (34)(856)Income tax (expense) benefit
 $105 $2,627 Net income
Amortization of defined benefit
   pension items		 
Actuarial gains (losses)$32 $(147)Salaries and employee benefits
 (8)36 Income tax (expense) benefit
 $24 $(111)Net income
Total reclassifications for the period$(7,957)$5,528 Net income