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ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component, Net of Tax
The following is a summary of the changes in accumulated other comprehensive income or 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 December 31, 2016
 
$
(4,356
)
 
$
(6,398
)
 
$
(10,754
)
Other comprehensive income before reclassification
 
1,578

 
622

 
2,200

Amounts reclassified from accumulated other comprehensive income (loss)
 
(68
)
 
119

 
51

Net current period other comprehensive income
 
1,510

 
741

 
2,251

Stranded AOCI reclassification
 
(569
)
 
(1,268
)
 
(1,837
)
Balance at December 31, 2017
 
$
(3,415
)
 
$
(6,925
)
 
$
(10,340
)

 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at December 31, 2015
 
$
210

 
$
(11,152
)
 
$
(10,942
)
Other comprehensive income (loss) before reclassification
 
(3,952
)
 
3,341

 
(611
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
(614
)
 
1,413

 
799

Net current period other comprehensive income (loss)
 
(4,566
)
 
4,754

 
188

Balance at December 31, 2016
 
$
(4,356
)
 
$
(6,398
)
 
$
(10,754
)


 
 
Unrealized Gains and Losses on Securities Available for Sale
 
Defined Benefit and Other Benefit Plans
 
Total
Balance at January 1, 2015
 
$
1,960

 
$
(10,745
)
 
$
(8,785
)
Other comprehensive income (loss) before reclassification
 
(1,520
)
 
(1,268
)
 
(2,788
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
(230
)
 
861

 
631

Net current period other comprehensive loss
 
(1,750
)
 
(407
)
 
(2,157
)
Balance at December 31, 2015
 
$
210

 
$
(11,152
)
 
$
(10,942
)
Reclassification Out of Accumulated Other Comprehensive Income
The following is the reclassification out of accumulated other comprehensive income (loss) for the periods indicated (in thousands):
Details about Accumulated Other Comprehensive Income (Loss) Components
 
Year Ended December 31,
 
Affected Line Item
 in the Statement Where
Net Income is Presented
 
 
2017
 
2016
 
2015
 
 
Unrealized gains and losses on securities available for sale:
 
 
 
 
 
 
 
     
Realized gains on securities available for sale
 
$
(109
)
 
$
(987
)
 
$
(372
)
 
Net gains on securities transactions
Tax effect
 
41

 
373

 
142

 
Income tax expense
Net of tax
 
(68
)
 
(614
)
 
(230
)
 
 
 
 
 
 
 
 
 
 
 
Amortization of defined pension plan and other benefit plan items:
 
 

 
 

 
 

 
     
Prior service costs (a)
 
(220
)
 
674

 
(90
)
 
Pension and other employee benefits
Actuarial losses (a)
 
413

 
1,595

 
1,484

 
Pension and other employee benefits
Tax effect
 
(74
)
 
(856
)
 
(533
)
 
Income tax expense
Net of tax
 
119

 
1,413

 
861

 
 
Total reclassification for the period, net of tax
 
$
51

 
$
799

 
$
631

 
 
(a) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension and other benefit plan costs (see Note 12 for additional information).