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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
6 Months Ended
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
14. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following tables present the components of other comprehensive loss for the three and six months ended June 30, 2022 and 2021, by component:
(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended June 30, 2022   
Net change in fair value of available-for-sale investment securities:   
Net unrealized losses arising during the period$(61,628)$(16,478)$(45,150)
Less: Amortization of unrealized losses on investment securities transferred to held-to-maturity1,976 528 1,448 
Net change in fair value of available-for-sale investment securities(59,652)(15,950)(43,702)
Net change in fair value of derivatives:
Net unrealized gains arising during the period2,930 783 2,147 
Net change in fair value of derivatives2,930 783 2,147 
Defined benefit retirement plan and SERPs:   
Net actuarial losses arising during the period(952)(255)(697)
Amortization of net actuarial loss131 35 96 
Amortization of net transition obligation
Settlement4,884 1,817 3,067 
Defined benefit retirement plan and SERPs4,068 1,598 2,470 
Other comprehensive loss$(52,654)$(13,569)$(39,085)

(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended June 30, 2021   
Net change in fair value of available-for-sale investment securities:   
Net unrealized gains arising during the period$2,407 $643 $1,764 
Less: Reclassification adjustments from AOCI realized in net income(50)(13)(37)
Net change in fair value of available-for-sale investment securities2,357 630 1,727 
Defined benefit retirement plan and SERPs:   
Amortization of net actuarial loss272 87 185 
Amortization of net transition obligation
Defined benefit retirement plan and SERPs276 88 188 
Other comprehensive income$2,633 $718 $1,915 
(dollars in thousands)Before TaxTax EffectNet of Tax
Six Months Ended June 30, 2022   
Net change in fair value of available-for-sale investment securities:   
Net unrealized losses arising during the period$(170,076)$(45,476)$(124,600)
Less: Amortization of unrealized losses on investment securities transferred to held-to-maturity1,976 528 1,448 
Net change in fair value of available-for-sale investment securities(168,100)(44,948)(123,152)
Net change in fair value of derivatives:
Net unrealized gains arising during the period2,880 770 2,110 
Net change in fair value of derivatives2,880 770 2,110 
Defined benefit retirement plan and SERPs:  
Net actuarial losses arising during the period(952)(255)(697)
Amortization of net actuarial loss264 71 193 
Amortization of net transition obligation
Settlement4,884 1,817 3,067 
Defined benefit retirement plan and SERPs4,205 1,635 2,570 
Other comprehensive loss$(161,015)$(42,543)$(118,472)

(dollars in thousands)Before TaxTax EffectNet of Tax
Six Months Ended June 30, 2021   
Net change in fair value of available-for-sale investment securities:   
Net unrealized losses arising during the period$(21,212)$(5,675)$(15,537)
Less: Reclassification adjustments from AOCI realized in net income(50)(13)(37)
Net change in fair value of available-for-sale investment securities(21,262)(5,688)(15,574)
Defined benefit retirement plan and SERPs:   
Amortization of net actuarial loss518 153 365 
Amortization of net transition obligation
Defined benefit retirement plan and SERPs527 155 372 
Other comprehensive loss$(20,735)$(5,533)$(15,202)

The following tables present the changes in each component of AOCI, net of tax, for the three and six months ended June 30, 2022 and 2021:
(dollars in thousands)Investment SecuritiesDerivativesDefined Benefit Retirement Plan and SERPs [1]AOCI
Three Months Ended June 30, 2022   
Balance at beginning of period$(83,116)$(37)$(4,194)$(87,347)
Other comprehensive (loss) income before reclassifications(45,150)2,147 (697)(43,700)
Reclassification adjustments from AOCI1,448 — 3,167 4,615 
Total other comprehensive (loss) income(43,702)2,147 2,470 (39,085)
Balance at end of period$(126,818)$2,110 $(1,724)$(126,432)
(dollars in thousands)Investment SecuritiesDerivativesDefined Benefit Retirement Plan and SERPs [1]AOCI
Three Months Ended June 30, 2021   
Balance at beginning of period$9,350 $— $(6,339)$3,011 
Other comprehensive income before reclassifications1,764 — — 1,764 
Reclassification adjustments from AOCI(37)— 188 151 
Total other comprehensive income1,727 — 188 1,915 
Balance at end of period$11,077 $— $(6,151)$4,926 

(dollars in thousands)Investment SecuritiesDerivativesDefined Benefit Retirement Plan and SERPs [1]AOCI
Six Months Ended June 30, 2022   
Balance at beginning of period$(3,666)$— $(4,294)$(7,960)
Other comprehensive (loss) income before reclassifications(124,600)2,110 (697)(123,187)
Reclassification adjustments from AOCI1,448 — 3,267 4,715 
Total other comprehensive (loss) income(123,152)2,110 2,570 (118,472)
Balance at end of period$(126,818)$2,110 $(1,724)$(126,432)

(dollars in thousands)Investment SecuritiesDerivativesDefined Benefit Retirement Plan and SERPs [1]AOCI
Six Months Ended June 30, 2021   
Balance at beginning of period$26,651 $— $(6,523)$20,128 
Other comprehensive loss before reclassifications(15,537)— — (15,537)
Reclassification adjustments from AOCI(37)— 372 335 
Total other comprehensive (loss) income(15,574)— 372 (15,202)
Balance at end of period$11,077 $— $(6,151)$4,926 
[1] During the second quarter of 2022, the Company settled all obligations related to its defined benefit retirement plan. As a result, the AOCI balance in the defined benefit retirement plan and SERPs column as of June 30, 2022 relates entirely to the SERPs.
The following table presents the amounts reclassified out of each component of AOCI for the three and six months ended June 30, 2022 and 2021:
 Amount Reclassified from AOCIAffected Line Item in the Statement Where Net Income is Presented
Details about AOCI ComponentsThree months ended June 30,
(dollars in thousands)20222021
Sale of available-for-sale investment securities:
Realized gain on sales of available-for-sale investment securities$— $50 Net gain on sales of investment securities
Tax effect— (13)Income tax benefit (expense)
Net of tax$— $37 
Amortization of unrealized losses on investment securities transferred to held-to-maturity:
Amortization$(1,976)$— 
Tax effect528 — 
Net of tax$(1,448)$— 
Defined benefit retirement and supplemental executive retirement plan items:   
Amortization of net actuarial loss$(131)$(272)Other operating expense - other
Amortization of net transition obligation(5)(4)Other operating expense - other
Amortization of prior service cost— — Other operating expense - other
Settlement(4,884)— Other operating expense - other
Total before tax(5,020)(276)
Tax effect1,853 88 Income tax benefit (expense)
Net of tax$(3,167)$(188)
Total reclassification adjustments from AOCI for the period, net of tax$(4,615)$(151)
 Amount Reclassified from AOCIAffected Line Item in the Statement Where Net Income is Presented
Details about AOCI ComponentsSix months ended June 30,
(dollars in thousands)20222021
Sale of available-for-sale investment securities:
Realized gain on sales of available-for-sale investment securities$— $50 Net gain on sales of investment securities
Tax effect— (13)Income tax benefit (expense)
Net of tax$— $37 
Amortization of unrealized losses on investment securities transferred to held-to-maturity:
Amortization$(1,976)$— 
Tax effect528 — 
Net of tax$(1,448)$— 
Defined benefit retirement and supplemental executive retirement plan items:   
Amortization of net actuarial loss$(264)$(518)Other operating expense - other
Amortization of net transition obligation(9)(9)Other operating expense - other
Amortization of prior service cost— — Other operating expense - other
Settlement(4,884)— Other operating expense - other
Total before tax(5,157)(527)
Tax effect1,890 155 Income tax benefit (expense)
Net of tax$(3,267)$(372)
Total reclassification adjustments from AOCI for the period, net of tax$(4,715)$(335)