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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2021
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
Year Ended December 31, 2021
Balance at beginning of period$145,335 $— $2,584 $(148)$147,771 
Other comprehensive income (loss) before
      reclassifications
(144,948)— 1,433 — (143,515)
Amounts reclassified from AOCI to income (1)(3,337)— (3,474)180 (6,631)
Balance at end of period$(2,950)$— $543 $32 $(2,375)
Year Ended December 31, 2020
Balance at beginning of period$56,131 $— $240 $(164)$56,207 
Other comprehensive income (loss) before
      reclassifications
97,596 — 6,230 — 103,826 
Amounts reclassified from AOCI (1)(8,392)— (3,886)16 (12,262)
Balance at end of period$145,335 $— $2,584 $(148)$147,771 
Year Ended December 31, 2019
Balance at beginning of period$(37,348)$(8,515)$1,099 $(186)$(44,950)
Other comprehensive income (loss) before
      reclassifications
94,964 6,419 (410)— 100,973 
Amounts reclassified from AOCI (1)(1,485)2,096 (449)22 184 
Balance at end of period$56,131 $— $240 $(164)$56,207 
(1)See table below for details about reclassifications to income.
The following table summarizes the significant amounts reclassified out of each component of AOCI:
Years Ended December 31,
(dollars in thousands)202120202019
Details about AOCI ComponentsAmount Reclassified
from AOCI		Affected Line Item in the
Statement of Income
Unrealized gains and losses on
   available-for-sale debt securities		$4,327 $10,767 $1,923 Debt securities gains (losses), net
(990)(2,375)(438)Income tax (expense) benefit
$3,337 $8,392 $1,485 Net income
Unrealized gains and losses on
   held-to-maturity securities		$— $— $(2,812)Interest income (expense)
— — 716 Income tax (expense) benefit
$— $— $(2,096)Net income
Gains and losses on cash flow hedges
   Interest rate contracts		$4,605 $5,153 $596 Interest income (expense)
(1,131)(1,267)(147)Income tax (expense) benefit
$3,474 $3,886 $449 Net income
Amortization of defined benefit
   pension items
Actuarial gains (losses)$(239)$(21)$(30)Salaries and employee benefits
59 5 8 Income tax (expense) benefit
$(180)$(16)$(22)Net income
Total reclassifications for the period$6,631 $12,262 $(184)Net income