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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss)
 Three months ended June 30, 2020
 Total other comprehensive income (loss)Total accumulated other
comprehensive income (loss)
(Dollars in thousands)Prior to
reclass
Reclass
from
Pre-taxTax effectNet of taxBeginning balanceNet activityEnding balance
Unrealized gain (loss) on debt securities$30,977  $ $30,975  $(6,685) $24,290  $39,401  $24,290  $63,691  
Retirement obligation (457) 457  (104) 353  (27,613) 353  (27,260) 
Total$30,977  $(455) $31,432  $(6,789) $24,643  $11,788  $24,643  $36,431  
 Three months ended June 30, 2019
 Total other comprehensive income (loss)Total accumulated other
comprehensive income (loss)
(Dollars in thousands)Prior to
reclass
Reclass
from
Pre-taxTax effectNet of taxBeginning balanceNet activityEnding balance
Unrealized gain (loss) on debt securities$31,144  $(37) $31,181  $(6,671) $24,510  $12,810  $24,510  $37,320  
Unrealized gain (loss) on derivatives94   94  (22) 72  (145) 72  (73) 
Retirement obligation (320) 320  (74) 246  (32,300) 246  (32,054) 
Total$31,238  $(357) $31,595  $(6,767) $24,828  $(19,635) $24,828  $5,193  
 Six months ended June 30, 2020
 Total other comprehensive income (loss)Total accumulated
other comprehensive income (loss)
(Dollars in thousands)Prior to
reclass
Reclass
from
Pre-taxTax effectNet of taxBeginning balanceNet activityEnding balance
Unrealized gain (loss) on debt securities$28,543  $(57) $28,600  $(6,173) $22,427  $41,264  $22,427  $63,691  
Retirement obligation (882) 882  (201) 681  (27,941) 681  (27,260) 
Total$28,543  $(939) $29,482  $(6,374) $23,108  $13,323  $23,108  $36,431  
 Six months ended June 30, 2019
 Total other comprehensive income (loss)Total accumulated
other comprehensive income (loss)
(Dollars in thousands)Prior to
reclass
Reclass
from
Pre-taxTax effectNet of taxBeginning balanceNet activityCumulative effect of new standardEnding balance
Unrealized gain (loss) on debt securities$60,869  $(215) $61,084  $(13,069) $48,015  $(11,601) $48,015  $906  $37,320  
Unrealized gain (loss) on derivatives187   187  (43) 144  (217) 144   (73) 
Retirement obligation (695) 695  (159) 536  (32,590) 536   (32,054) 
Total$61,056  $(910) $61,966  $(13,271) $48,695  $(44,408) $48,695  $906  $5,193  
Other Accumulated Comprehensive income reclassified from AOCI The following table presents the activity reclassified from accumulated other comprehensive income into income during the three and six month periods ended June 30, 2020 and 2019, respectively:
Amount reclassified from
accumulated other comprehensive income (loss)
Three months endedSix months ended
June 30,June 30,
(Dollars in thousands)2020201920202019Affected Line Item in the Consolidated Statements of Income
Realized gain (loss) on securities available-for-sale$ $(37) $(57) $(215) Net gain (loss) on sales of investments securities
Defined benefit pension plan
Amortization of prior service cost (1)
102  106  202  206  Other noninterest expense
Recognized net actuarial loss (1)
(559) (426) (1,084) (901) Other noninterest expense
Defined benefit pension plan total(457) (320) (882) (695) 
Total reclassifications for the period, before tax$(455) $(357) $(939) $(910) 
(1) Included in the computation of net periodic pension cost (see Note 13 - Employee Benefit Plans for additional details).