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Comprehensive Income/Loss
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
COMPREHENSIVE INCOME/LOSS
COMPREHENSIVE INCOME (LOSS)
The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
 
Three Months Ended
June 30, 2018
 
Six Months Ended
June 30, 2018
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
(2,533
)
 
$
609

 
$
(1,924
)
 
$
(9,773
)
 
$
2,381

 
$
(7,392
)
Less: net security gains reclassified into other noninterest income (expense)
—

 
—

 
—

 
—

 
—

 
—

Net change in fair value of securities available for sale
(2,533
)
 
609

 
(1,924
)
 
(9,773
)
 
2,381

 
(7,392
)
 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of cash flow hedges
10

 
(2
)
 
8

 
396

 
(108
)
 
288

Less: net cash flow hedge gains reclassified into interest income or interest expense (1)
167

 
(47
)
 
120

 
257

 
(72
)
 
185

Net change in fair value of cash flow hedges
(157
)
 
45

 
(112
)
 
139

 
(36
)
 
103

 
 
 
 
 
 
 
 
 
 
 
 
Amortization of net actuarial losses
93

 
(27
)
 
66

 
187

 
(53
)
 
134

Amortization of net prior service costs
69

 
(18
)
 
51

 
138

 
(38
)
 
100

Net change in other comprehensive income for defined benefit postretirement plans (2)
162

 
(45
)
 
117

 
325

 
(91
)
 
234

Total other comprehensive loss
$
(2,528
)
 
$
609

 
$
(1,919
)
 
$
(9,309
)
 
$
2,254

 
$
(7,055
)
 
Three Months Ended
June 30, 2017
 
Six Months Ended
June 30, 2017
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
Pre Tax
Amount
 
Tax (Expense)
Benefit
 
After Tax
Amount
 
(Dollars in thousands)
Change in fair value of securities available for sale
$
1,277

 
$
(485
)
 
$
792

 
$
2,173

 
$
(849
)
 
$
1,324

Less: net security gains reclassified into other noninterest income
1

 
(1
)
 
—

 
2

 
(1
)
 
1

Net change in fair value of securities available for sale
1,276

 
(484
)
 
792

 
2,171

 
(848
)
 
1,323

 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of cash flow hedges
(399
)
 
162

 
(237
)
 
(341
)
 
138

 
(203
)
Less: net cash flow hedge losses reclassified into interest income or interest expense (1)
(80
)
 
33

 
(47
)
 
(173
)
 
71

 
(102
)
Net change in fair value of cash flow hedges
(319
)
 
129

 
(190
)
 
(168
)
 
67

 
(101
)
 
 
 
 
 
 
 
 
 
 
 
 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period
(7
)
 
3

 
(4
)
 
(14
)
 
6

 
(8
)
Amortization of net actuarial losses
69

 
(28
)
 
41

 
139

 
(57
)
 
82

Amortization of net prior service costs
69

 
(28
)
 
41

 
138

 
(56
)
 
82

Net change in other comprehensive income for defined benefit postretirement plans (2)
131

 
(53
)
 
78

 
263

 
(107
)
 
156

Total other comprehensive income
$
1,088

 
$
(408
)
 
$
680

 
$
2,266

 
$
(888
)
 
$
1,378

 
(1)
Includes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in 2009. The original gain of $1.4 million, net of tax, is being recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $78,000 and $137,000 at June 30, 2018 and December 31, 2017, respectively.

(2)
The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission.
Effective January 1, 2018, the Company elected to reclassify certain tax effects from accumulated other comprehensive income to retained earnings, related to items that were stranded in other comprehensive income as a result of the Tax Act. A description of the other income tax effects that were reclassified as a result of the Act are listed in the table below.
Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the periods indicated:
 
Unrealized Gain on Securities
 
Unrealized Gain (Loss) on Cash Flow Hedge
 
Deferred Gain on Hedge Transactions
 
Defined Benefit Postretirement Plans
 
Accumulated Other Comprehensive Income (Loss)
 
(Dollars in thousands)
 
2018
Beginning balance: January 1, 2018
$
(504
)
 
$
948

 
$
137

 
$
(2,412
)
 
$
(1,831
)
Opening balance reclassification
(111
)
 
205

 
29

 
(520
)
 
(397
)
Cumulative effect accounting adjustment
(831
)
 
—

 
—

 
—

 
(831
)
Net change in other comprehensive income (loss)
(7,392
)
 
191

 
(88
)
 
234

 
(7,055
)
Ending balance: June 30, 2018
$
(8,838
)
 
$
1,344

 
$
78

 
$
(2,698
)
 
$
(10,114
)
 
2017
Beginning balance: January 1, 2017
$
173

 
$
361

 
$
281

 
$
(2,152
)
 
$
(1,337
)
Net change in other comprehensive income (loss)
1,323

 
(29
)
 
(72
)
 
156

 
1,378

Ending balance: June 30, 2017
$
1,496

 
$
332

 
$
209

 
$
(1,996
)
 
$
41