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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
 3 Months Ended
Mar. 31, 2021
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 income for the three months ended March 31, 2021 and 2020, by component:
 
(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)$(17,301)
Less: Reclassification adjustments from AOCI realized in net income— — — 
Net unrealized losses on investment securities(23,619)(6,318)(17,301)
Defined benefit plans:   
Amortization of net actuarial loss246 66 180 
Amortization of net transition obligation5 1 4 
Defined benefit plans, net251 67 184 
Other comprehensive loss$(23,368)$(6,251)$(17,117)

(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended March 31, 2020   
Net unrealized gains on investment securities:   
Net unrealized gains arising during the period$13,858 $3,711 $10,147 
Less: Reclassification adjustments from AOCI realized in net income— — — 
Net unrealized gains on investment securities13,858 3,711 10,147 
Defined benefit plans:   
Net actuarial gains arising during the period427 114 313 
Amortization of net actuarial loss268 72 196 
Amortization of net transition obligation5 1 4 
Amortization of prior service cost4 1 3 
Defined benefit plans, net704 188 516 
Other comprehensive income$14,562 $3,899 $10,663 
The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2021 and 2020:

(dollars in thousands)Investment
Securities		Defined
Benefit
Plans		AOCI
Three Months Ended March 31, 2021   
Balance at beginning of period$26,651 $(6,523)$20,128 
Other comprehensive income (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 

(dollars in thousands)Investment
Securities		Defined
Benefit
Plans		AOCI
Three Months Ended March 31, 2020   
Balance at beginning of period$14,825 $(6,416)$8,409 
Other comprehensive income before reclassifications10,147 313 10,460 
Reclassification adjustments from AOCI— 203 203 
Total other comprehensive income10,147 516 10,663 
Balance at end of period$24,972 $(5,900)$19,072 


The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2021 and 2020:

 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)20212020
Defined benefit retirement and supplemental executive retirement plan items:   
Amortization of net actuarial loss$(246)$(268)Other operating expense - other
Amortization of net transition obligation(5)(5)Other operating expense - other
Amortization of prior service cost— (4)Other operating expense - other
Total before tax(251)(277)
Tax effect67 74 Income tax benefit (expense)
Net of tax$(184)$(203)
Total reclassification adjustments from AOCI for the period, net of tax$(184)$(203)