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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of components of other comprehensive income (loss)
The following tables present the components of other comprehensive income for the three months ended March 31, 2018 and 2017, by component:
 
(dollars in thousands)
Before Tax
 
Tax Effect
 
Net of Tax
Three Months Ended March 31, 2018
 

 
 

 
 

Net unrealized losses on investment securities:
 

 
 

 
 

Net unrealized losses arising during the period
$
(20,455
)
 
$
(5,484
)
 
$
(14,971
)
Less: Reclassification adjustments from AOCI realized in net income
—

 
—

 
—

Net unrealized losses on investment securities
(20,455
)
 
(5,484
)
 
(14,971
)
 
 
 
 
 
 
Defined benefit plans:
 

 
 

 
 

Amortization of net actuarial loss
341

 
93

 
248

Amortization of net transition obligation
5

 
1

 
4

Amortization of prior service cost
5

 
1

 
4

Settlement
—

 
—

 
—

Defined benefit plans, net
351

 
95

 
256

 
 
 
 
 
 
Other comprehensive loss
$
(20,104
)
 
$
(5,389
)
 
$
(14,715
)

(dollars in thousands)
Before Tax
 
Tax Effect
 
Net of Tax
Three Months Ended March 31, 2017
 

 
 

 
 

Net unrealized gains on investment securities:
 

 
 

 
 

Net unrealized gains arising during the period
$
3,527

 
$
1,403

 
$
2,124

Less: Reclassification adjustments from AOCI realized in net income
—

 
—

 
—

Net unrealized gains on investment securities
3,527

 
1,403

 
2,124

 
 
 
 
 
 
Defined benefit plans:
 

 
 

 
 

Net actuarial losses arising during the period
(1,042
)
 
(415
)
 
(627
)
Amortization of net actuarial loss
421

 
164

 
257

Amortization of net transition obligation
4

 
1

 
3

Amortization of prior service cost
4

 
1

 
3

Defined benefit plans, net
(613
)
 
(249
)
 
(364
)
 
 
 
 
 
 
Other comprehensive income
$
2,914

 
$
1,154

 
$
1,760

 
 
 
 
 
 
Schedule of changes in each component of AOCI, net of tax
The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2018 and 2017:
 
(dollars in thousands)
Investment
Securities
 
Defined
Benefit
Plans
 
AOCI
Three Months Ended March 31, 2018
 

 
 

 
 

Balance at beginning of period
$
5,073

 
$
(6,112
)
 
$
(1,039
)
 
 
 
 
 
 
Impact of the adoption of new accounting standards
(594
)
 
(1,381
)
 
(1,975
)
 
 
 
 
 
 
Other comprehensive loss before reclassifications
(14,971
)
 
—

 
(14,971
)
Reclassification adjustments from AOCI
—

 
256

 
256

Total other comprehensive income (loss)
(14,971
)
 
256

 
(14,715
)
 
 
 
 
 
 
Balance at end of period
$
(10,492
)
 
$
(7,237
)
 
$
(17,729
)


(dollars in thousands)
Investment
Securities
 
Defined
Benefit
Plans
 
AOCI
Three Months Ended March 31, 2017
 

 
 

 
 

Balance at beginning of period
$
4,729

 
$
(6,250
)
 
$
(1,521
)
 
 
 
 
 
 
Other comprehensive income (loss)before reclassifications
2,124

 
(627
)
 
1,497

Reclassification adjustments from AOCI
—

 
263

 
263

Total other comprehensive income (loss)
2,124

 
(364
)
 
1,760

 
 
 
 
 
 
Balance at end of period
$
6,853

 
$
(6,614
)
 
$
239

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of amounts reclassified out of each component of AOCI
The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2018 and 2017:
 
 
Amount Reclassified from AOCI
 
Affected Line Item in the Statement Where Net Income is Presented
Details about AOCI Components
Three months ended March 31,
 
(dollars in thousands)
2018
 
2017
 
Sale of investment securities available-for-sale
$
—

 
$
—

 
Investment securities gains (losses)
 
—

 
—

 
Income tax benefit (expense)
 
$
—

 
$
—

 
Net of tax
 
 
 
 
 
 
Amortization of defined benefit retirement and supplemental executive retirement plan items
 

 
 

 
 
Net actuarial loss
$
(341
)
 
$
(421
)
 
(1)
Net transition obligation
(5
)
 
(4
)
 
(1)
Prior service cost
(5
)
 
(4
)
 
(1)
Settlement
—

 
—

 
(1)
 
(351
)
 
(429
)
 
Total before tax
 
95

 
166

 
Income tax benefit (expense)
 
$
(256
)
 
$
(263
)
 
Net of tax
 
 
 
 
 
 
Total reclassification adjustments from AOCI for the period
$
(256
)
 
$
(263
)
 
Net of tax
 
 
 
 
 
 
 

(1)
These AOCI components are included in the computation of net periodic pension cost (see Note 15 - Pension and Supplemental Executive Retirement Plans for additional details).