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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
3 Months Ended
Mar. 31, 2020
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, 2020 and 2019, by component:
 
(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 obligation   
Amortization of prior service cost   
Defined benefit plans, net704  188  516  
Other comprehensive income$14,562  $3,899  $10,663  

(dollars in thousands)Before TaxTax EffectNet of Tax
Three Months Ended March 31, 2019   
Net unrealized gains on investment securities:   
Net unrealized gains arising during the period$15,024  $4,028  $10,996  
Less: Reclassification adjustments from AOCI realized in net income—  —  —  
Net unrealized gains on investment securities15,024  4,028  10,996  
Defined benefit plans:   
Amortization of net actuarial loss263  29  234  
Amortization of net transition obligation   
Amortization of prior service cost   
Defined benefit plans, net273  31  242  
Other comprehensive income$15,297  $4,059  $11,238  
The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2020 and 2019:
 
(dollars in thousands)Investment
Securities
Defined
Benefit
Plans
AOCI
Three Months Ended March 31, 2020   
Balance at beginning of period14,825  (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  

(dollars in thousands)Investment
Securities
Defined
Benefit
Plans
AOCI
Three Months Ended March 31, 2019   
Balance at beginning of period$(9,643) $(6,450) $(16,093) 
Impact of the adoption of new accounting standards(3,100) —  (3,100) 
Adjusted balance at beginning of period(12,743) (6,450) (19,193) 
Other comprehensive loss before reclassifications10,996  —  10,996  
Reclassification adjustments from AOCI—  242  242  
Total other comprehensive income10,996  242  11,238  
Balance at end of period$(1,747) $(6,208) $(7,955) 


The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2020 and 2019:
 
 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)20202019
Defined benefit retirement and supplemental executive retirement plan items:   
Amortization of net actuarial loss$(268) $(263) Salaries and employee benefits  
Amortization of net transition obligation(5) (5) Salaries and employee benefits  
Amortization of prior service cost(4) (5) Salaries and employee benefits  
Total before tax(277) (273) 
Tax effect74  31  Income tax benefit (expense)
Net of tax$(203) $(242) 
Total reclassification adjustments from AOCI for the period, net of tax$(203) $(242)