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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of other comprehensive income
The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2018 and 2017:
(dollars in thousands)
Before Tax

 
Tax Effect

 
Net of Tax

Three Months Ended March 31, 2018
 

 
 

 
 

Net Unrealized Gains (Losses) on Investment Securities:
 

 
 

 
 

Net Unrealized Gains (Losses) Arising During the Period
$
(13,057
)
 
$
(3,452
)
 
$
(9,605
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
 
 
 
 
 
  Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1
659

 
175

 
484

Net Unrealized Gains (Losses) on Investment Securities
(12,398
)
 
(3,277
)
 
(9,121
)
Defined Benefit Plans:
 

 
 

 
 

Amortization of Net Actuarial Losses (Gains)
436

 
116

 
320

Amortization of Prior Service Credit
(142
)
 
(38
)
 
(104
)
Defined Benefit Plans, Net
294

 
78

 
216

Other Comprehensive Income (Loss)
$
(12,104
)
 
$
(3,199
)
 
$
(8,905
)
 
 
 
 
 
 
Three Months Ended March 31, 2017
 

 
 

 
 

Net Unrealized Gains (Losses) on Investment Securities:
 

 
 

 
 

Net Unrealized Gains (Losses) Arising During the Period
$
7,580

 
$
2,991

 
$
4,589

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
 
 
 
 
 
  Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1
504

 
199

 
305

Net Unrealized Gains (Losses) on Investment Securities
8,084

 
3,190

 
4,894

Defined Benefit Plans:
 

 
 

 
 

Amortization of Net Actuarial Losses (Gains)
323

 
128

 
195

Amortization of Prior Service Credit
(81
)
 
(32
)
 
(49
)
Defined Benefit Plans, Net
242

 
96

 
146

Other Comprehensive Income (Loss)
$
8,326

 
$
3,286

 
$
5,040


1 
The amount relates to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
Schedule of accumulated other comprehensive income (loss)
The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2018 and 2017:
(dollars in thousands)
 
Investment Securities-Available-for-Sale

 
Investment Securities-Held-to-Maturity

 
Defined Benefit Plans

 
Accumulated Other Comprehensive Income (Loss)

Three Months Ended March 31, 2018
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
(1,915
)
 
$
(5,085
)
 
$
(27,715
)
 
$
(34,715
)
Other Comprehensive Income (Loss) Before Reclassifications
 
(9,605
)
 
—

 
—

 
(9,605
)
Amounts Reclassified from Accumulated Other
        Comprehensive Income (Loss)
 
—

 
484

 
216

 
700

Total Other Comprehensive Income (Loss)
 
(9,605
)
 
484

 
216

 
(8,905
)
Reclassification of the Income Tax Effects of the
Tax Cuts and Jobs Act from AOCI
 
(412
)
 
(1,096
)
 
(5,969
)
 
(7,477
)
Balance at End of Period
 
$
(11,932
)
 
$
(5,697
)
 
$
(33,468
)
 
$
(51,097
)
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017
 
 
 
 
 
 
 
 
Balance at Beginning of Period
 
$
1,270

 
$
(6,284
)
 
$
(28,892
)
 
$
(33,906
)
Other Comprehensive Income (Loss) Before Reclassifications
 
4,589

 
—

 
—

 
4,589

Amounts Reclassified from Accumulated Other
        Comprehensive Income (Loss)
 
—

 
305

 
146

 
451

Total Other Comprehensive Income (Loss)
 
4,589

 
305

 
146

 
5,040

Balance at End of Period
 
$
5,859

 
$
(5,979
)
 
$
(28,746
)
 
$
(28,866
)
Reclassification out of accumulated other comprehensive income
The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2018 and 2017:
Details about Accumulated Other
Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1
 
Affected Line Item in the Statement Where Net Income Is Presented
 
Three Months Ended March 31,
 
(dollars in thousands)
2018

2017

 
Amortization of Unrealized Holding Gains (Losses) on
     Investment Securities Held-to-Maturity
$
(659
)
$
(504
)
Interest Income
 
175

199

Provision for Income Tax
 
(484
)
(305
)
Net of Tax
 
 
 
 
Amortization of Defined Benefit Plan Items
 
 
 
Prior Service Credit 2
142

81

 
Net Actuarial Losses 2
(436
)
(323
)
 
 
(294
)
(242
)
Total Before Tax
 
78

96

Provision for Income Tax
 
(216
)
(146
)
Net of Tax
 
 
 
 
Total Reclassifications for the Period
$
(700
)
$
(451
)
Net of Tax
1 
Amounts in parentheses indicate reductions to net income.
2 
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in Other Noninterest Expense on the consolidated statements of income (see Note 11 Pension Plans and Postretirement Benefit Plan for additional details).