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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss) The related tax effects allocated to other comprehensive income and reclassifications out of accumulated other comprehensive income (loss) are as follows:
 
Three months ended March 31, 2018
 
Total other comprehensive income (loss)
 
Total accumulated other
comprehensive income (loss)
(Dollars in thousands)
Prior to
Reclass
 
Reclass
from
 
Pre-tax
 
Tax-effect
 
Net of tax
 
Beginning Balance
 
Net Activity
 
Reclass of Stranded Tax Effects
 
Ending Balance
Unrealized gain (loss) on investment securities
$
(12,536
)
 
$
0

 
$
(12,536
)
 
$
2,706

 
$
(9,830
)
 
$
(182
)
 
$
(9,830
)
 
$
(39
)
 
$
(10,051
)
Unrealized gain (loss) on derivatives
202

 
0

 
202

 
(46
)
 
156

 
(577
)
 
156

 
(124
)
 
(545
)
Retirement obligation
0

 
(419
)
 
419

 
(96
)
 
323

 
(19,631
)
 
323

 
(4,779
)
 
(24,087
)
Total
$
(12,334
)
 
$
(419
)
 
$
(11,915
)
 
$
2,564

 
$
(9,351
)
 
$
(20,390
)
 
$
(9,351
)
 
$
(4,942
)
 
$
(34,683
)
 
Three months ended March 31, 2017
 
Total other comprehensive income (loss)
 
Total accumulated other
comprehensive income (loss)
(Dollars in thousands)
Prior to
Reclass
 
Reclass
from
 
Pre-tax
 
Tax-effect
 
Net of tax
 
Beginning Balance
 
Net Activity
 
Ending Balance
Unrealized gain (loss) on investment securities
$
2,832

 
$
516

 
$
2,316

 
$
(829
)
 
$
1,487

 
$
(4,549
)
 
$
1,487

 
$
(3,062
)
Unrealized gain (loss) on derivatives
203

 
0

 
203

 
(75
)
 
128

 
(1,091
)
 
128

 
(963
)
Retirement obligation
0

 
(335
)
 
335

 
(146
)
 
189

 
(22,803
)
 
189

 
(22,614
)
Total
$
3,035

 
$
181

 
$
2,854

 
$
(1,050
)
 
$
1,804

 
$
(28,443
)
 
$
1,804

 
$
(26,639
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other Accumulated Comprehensive income reclassified from AOCI The following table presents the activity reclassified from accumulated other comprehensive income into income during the three month periods ended March 31, 2018 and 2017, respectively:
 
 
Amount reclassified from
accumulated other comprehensive income (1)
 
 
 
 
Three months ended
 
 
 
 
March 31,
 
 
(Dollars in thousands)
 
2018
 
2017
 
Affected Line Item in the Consolidated Statements of Income
Realized gains and losses on securities available-for-sale
 
$
0

 
$
516

 
Net gains on sales of investments securities
Defined benefit pension plan
 
 
 
 
 
Amortization of prior service cost (2)
 
103

 
103

 
Salaries and employee benefits
Recognized net actuarial loss (2)
 
(522
)
 
(438
)
 
Salaries and employee benefits
Defined benefit pension plan total
 
(419
)
 
(335
)
 
 
Total reclassifications for the period, before tax
 
$
(419
)
 
$
181

 
 
(1) Negative amounts are reductions to net income.
(2) Included in the computation of net periodic pension cost (see Note 12 - Employee Benefit Plans for additional details).