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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
3 Months Ended
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
13. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following tables present the components of other comprehensive loss for the three months ended March 31, 2022 and 2021, by component:
(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended March 31, 2022   
Net unrealized losses on investment securities:   
Net unrealized losses arising during the period$(108,448)$(28,998)$(79,450)
Net unrealized losses on investment securities(108,448)(28,998)(79,450)
Net unrealized losses on derivatives:
Net unrealized losses arising during the period$(50)$(13)$(37)
Net unrealized losses on derivatives(50)(13)(37)
Defined benefit plans:   
Amortization of net actuarial loss133 36 97 
Amortization of net transition obligation
Defined benefit plans, net137 37 100 
Other comprehensive loss$(108,361)$(28,974)$(79,387)

(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended March 31, 2021   
Net unrealized losses on investment securities:   
Net unrealized losses arising during the period$(23,619)$(6,318)$(17,301)
Net unrealized losses on investment securities(23,619)(6,318)(17,301)
Defined benefit plans:   
Amortization of net actuarial loss246 66 180 
Amortization of net transition obligation
Defined benefit plans, net251 67 184 
Other comprehensive loss$(23,368)$(6,251)$(17,117)

The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2022 and 2021:
(dollars in thousands)Investment
Securities
DerivativesDefined
Benefit
Plans
AOCI
Three Months Ended March 31, 2022   
Balance at beginning of period$(3,666)$— $(4,294)$(7,960)
Other comprehensive loss before reclassifications(79,450)(37)— (79,487)
Reclassification adjustments from AOCI— — 100 100 
Total other comprehensive income (loss)(79,450)(37)100 (79,387)
Balance at end of period$(83,116)$(37)$(4,194)$(87,347)
(dollars in thousands)Investment
Securities
DerivativesDefined
Benefit
Plans
AOCI
Three Months Ended March 31, 2021   
Balance at beginning of period$26,651 $— $(6,523)$20,128 
Other comprehensive loss before reclassifications(17,301)— — (17,301)
Reclassification adjustments from AOCI— — 184 184 
Total other comprehensive income (loss)(17,301)— 184 (17,117)
Balance at end of period$9,350 $— $(6,339)$3,011 

The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2022 and 2021:
 Amount Reclassified from AOCIAffected Line Item in the Statement Where Net Income is Presented
Details about AOCI ComponentsThree months ended March 31,
(dollars in thousands)20222021
Defined benefit retirement and supplemental executive retirement plan items:   
Amortization of net actuarial loss$(133)$(246)Other operating expense - other
Amortization of net transition obligation(4)(5)Other operating expense - other
Total before tax(137)(251)
Tax effect37 67 Income tax benefit (expense)
Net of tax$(100)$(184)
Total reclassification adjustments from AOCI for the period, net of tax$(100)$(184)