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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Components of accumulated other comprehensive income (loss)
The following is a summary of the changes in accumulated other comprehensive loss by component, net of tax, for the periods indicated (in thousands):
 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at April 1, 2018
 
$
(6,924
)
 
$
(6,912
)
 
$
(13,836
)
Other comprehensive income before reclassification
 
(299
)
 
—

 
(299
)
Amounts reclassified from accumulated other comprehensive income
 
—

 
14

 
14

Net current period other comprehensive income (loss)
 
(299
)
 
14

 
(285
)
Balance at June 30, 2018
 
$
(7,223
)
 
$
(6,898
)
 
$
(14,121
)

 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at April 1, 2017
 
$
(2,379
)
 
$
(6,377
)
 
$
(8,756
)
Other comprehensive loss before reclassification
 
1,772

 
—

 
1,772

Amounts reclassified from accumulated other comprehensive income
 
(8
)
 
20

 
12

Net current period other comprehensive income
 
1,764

 
20

 
1,784

Balance at June 30, 2017
 
$
(615
)
 
$
(6,357
)
 
$
(6,972
)

 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at January 1, 2018
 
$
(3,415
)
 
$
(6,925
)
 
$
(10,340
)
Cumulative effect of account change
 
(202
)
 
—

 
(202
)
Balance at January 1, 2018, as adjusted
 
(3,617
)
 
(6,925
)
 
(10,542
)
Other comprehensive income before reclassification
 
(3,606
)
 
—

 
(3,606
)
Amounts reclassified from accumulated other comprehensive income
 
—

 
27

 
27

Net current period other comprehensive income (loss)
 
(3,606
)
 
27

 
(3,579
)
Balance at June 30, 2018
 
$
(7,223
)
 
$
(6,898
)
 
$
(14,121
)

 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at January 1, 2017
 
$
(4,356
)
 
$
(6,398
)
 
$
(10,754
)
Other comprehensive income before reclassification
 
3,749

 
—

 
3,749

Amounts reclassified from accumulated other comprehensive income
 
(8
)
 
41

 
33

Net current period other comprehensive income
 
3,741

 
41

 
3,782

Balance at June 30, 2017
 
$
(615
)
 
$
(6,357
)
 
$
(6,972
)
Reclassification out of accumulated other comprehensive income
The following is the reclassification out of accumulated other comprehensive income for the periods indicated (in thousands):
Details about Accumulated Other Comprehensive Income Components
 
Three Months Ended 
 June 30,
 
Affected Line Item
in the Statement Where
Net Income is Presented
 
 
2018
 
2017
 
 
Unrealized gains and losses on securities available for sale:
 
 
 
 
 
     
Realized gains on securities available for sale
 
$
—

 
$
(12
)
 
Net gains (losses) on securities transactions
Tax effect
 
—

 
4

 
Income tax expense
Net of tax
 
—

 
(8
)
 
 
Amortization of defined pension plan and other benefit plan items:
 
 

 
 

 
     
Prior service costs (a)
 
$
(55
)
 
$
(55
)
 
Other components of net periodic pension and postretirement benefits
Actuarial losses (a)
 
73

 
88

 
Other components of net periodic pension and postretirement benefits
Tax effect
 
(4
)
 
(13
)
 
Income tax expense
Net of tax
 
14

 
20

 
 
Total reclassification for the period, net of tax
 
$
14

 
$
12

 
 
(a) These accumulated other comprehensive income components are included in the computation of net periodic pension and other benefit plan costs (see Note 11 for additional information).

Details about Accumulated Other Comprehensive Income Components
 
Six Months Ended 
 June 30,
 
Affected Line Item
in the Statement Where
Net Income is Presented
 
 
2018
 
2017
 
 
Unrealized gains and losses on securities available for sale:
 
 
 
 
 
     
Realized gains on securities available for sale
 
$
—

 
$
(12
)
 
Net gains (losses) on securities transactions
Tax effect
 
—

 
4

 
Income tax expense
Net of tax
 
—

 
(8
)
 
 
Amortization of defined pension plan and other benefit plan items:
 
 

 
 

 
     
Prior service costs (a)
 
(110
)
 
(110
)
 
Other components of net periodic pension and postretirement benefits
Actuarial losses (a)
 
146

 
176

 
Other components of net periodic pension and postretirement benefits
Tax effect
 
(9
)
 
(25
)
 
Income tax expense
Net of tax
 
27

 
41

 
 
Total reclassification for the period, net of tax
 
$
27

 
$
33

 
 
(a) These accumulated other comprehensive income components are included in the computation of net periodic pension and other benefit plan costs (see Note 11 for additional information).