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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank
The table below sets forth the minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank as of December 31, 2017 and 2016:
(dollars in thousands)
Well Capitalized
Minimum Ratio

 
Company

 
Bank

As of December 31, 2017
 
 
 
 
 
Shareholders’ Equity
 
 
$
1,231,868

 
$
1,161,037

Common Equity Tier 1 Capital
 
 
1,238,063

 
1,178,804

Tier 1 Capital
 
 
1,238,063

 
1,178,804

Total Capital
 
 
1,352,231

 
1,292,972

Common Equity Tier 1 Capital Ratio
6.5
%
 
13.24
%
 
12.62
%
Tier 1 Capital Ratio
8.0
%
 
13.24
%
 
12.62
%
Total Capital Ratio
10.0
%
 
14.46
%
 
13.85
%
Tier 1 Leverage Ratio
5.0
%
 
7.26
%
 
6.92
%
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
Shareholders’ Equity
 
 
$
1,161,537

 
$
1,094,461

Common Equity Tier 1 Capital
 
 
1,168,228

 
1,111,525

Tier 1 Capital
 
 
1,168,228

 
1,111,525

Total Capital
 
 
1,278,528

 
1,221,683

Common Equity Tier 1 Capital Ratio
6.5
%
 
13.24
%
 
12.61
%
Tier 1 Capital Ratio
8.0
%
 
13.24
%
 
12.61
%
Total Capital Ratio
10.0
%
 
14.49
%
 
13.86
%
Tier 1 Leverage Ratio
5.0
%
 
7.21
%
 
6.86
%
Components of other comprehensive income
The following table presents the components of other comprehensive income (loss), net of tax:
(dollars in thousands)
Before Tax

 
Tax Effect

 
Net of Tax

Year Ended December 31, 2017
 
 
 
 
 
Net Unrealized Gains (Losses) on Investment Securities:
 
 
 
 
 
Net Unrealized Gains (Losses) Arising During the Period
$
(5,263
)
 
$
(2,078
)
 
$
(3,185
)
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
1,982

 
783

 
1,199

Net Unrealized Gains (Losses) on Investment Securities
(3,281
)
 
(1,295
)
 
(1,986
)
Defined Benefit Plans:

 

 
 
Net Actuarial Gains (Losses) Arising During the Period
884

 
349

 
535

Amortization of Net Actuarial Losses (Gains)
1,382

 
545

 
837

Amortization of Prior Service Credit
(322
)
 
(127
)
 
(195
)
Defined Benefit Plans, Net
1,944

 
767

 
1,177

Other Comprehensive Income (Loss)
$
(1,337
)
 
$
(528
)
 
$
(809
)
 
 
 
 
 
 
Year Ended December 31, 2016
 
 
 
 
 
Net Unrealized Gains (Losses) on Investment Securities:
 
 
 
 
 
Net Unrealized Gains (Losses) Arising During the Period
$
(18,647
)
 
$
(7,358
)
 
$
(11,289
)
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
1,605

 
634

 
971

Net Unrealized Gains (Losses) on Investment Securities
(17,042
)
 
(6,724
)
 
(10,318
)
Defined Benefit Plans:
 
 
 
 
 
Net Actuarial Gains (Losses) Arising During the Period
(954
)
 
(377
)
 
(577
)
Amortization of Net Actuarial Losses (Gains)
1,224

 
483

 
741

Amortization of Prior Service Credit
(322
)
 
(127
)
 
(195
)
Defined Benefit Plans, Net
(52
)
 
(21
)
 
(31
)
Other Comprehensive Income (Loss)
$
(17,094
)
 
$
(6,745
)
 
$
(10,349
)
 
 
 
 
 
 
Year Ended December 31, 2015
 
 
 
 
 
Net Unrealized Gains (Losses) on Investment Securities:
 
 
 
 
 
Net Unrealized Gains (Losses) Arising During the Period
$
(5,448
)
 
$
(2,138
)
 
$
(3,310
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income:
 
 
 
 
 
  (Gain) Loss on Sale
(190
)

(75
)

(115
)
  Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities 1
2,136

 
836

 
1,300

Net Unrealized Gains (Losses) on Investment Securities
(3,502
)
 
(1,377
)
 
(2,125
)
Defined Benefit Plans:
 
 
 
 
 
Net Actuarial Gains (Losses) Arising During the Period
7,335

 
2,869

 
4,466

Amortization of Net Actuarial Losses (Gains)
1,624

 
641

 
983

Amortization of Prior Service Credit
(322
)
 
(127
)
 
(195
)
Defined Benefit Plans, Net
8,637

 
3,383

 
5,254

Other Comprehensive Income (Loss)
$
5,135

 
$
2,006

 
$
3,129


1
The amount relates to the amortization/accretion of unrealized gains and losses related to the Company's reclassification of available-for-sale investment securities to the held-to-maturity category.
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:
(dollars in thousands)
Investment Securities-Available-For-Sale

 
Investment Securities-Held-To-Maturities

 
Defined Benefit Plans

Accumulated Other Comprehensive Income (Loss)

Year Ended December 31, 2017
 
 
 
 
 
 
Balance at Beginning of Period
$
1,270

 
$
(6,284
)
 
$
(28,892
)
$
(33,906
)
Other Comprehensive Income (Loss) Before Reclassifications
(3,185
)
 
—

 
535

(2,650
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
—

 
1,199

 
642

1,841

Total Other Comprehensive Income (Loss)
(3,185
)
 
1,199

 
1,177

(809
)
Balance at End of Period
$
(1,915
)
 
$
(5,085
)
 
$
(27,715
)
$
(34,715
)
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
 
 
 
 
 
Balance at Beginning Period
$
12,559

 
$
(7,255
)
 
$
(28,861
)
$
(23,557
)
Other Comprehensive Income (Loss) Before Reclassifications
(11,289
)
 
—

 
(577
)
(11,866
)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
—

 
971

 
546

1,517

Total Other Comprehensive Income (Loss)
(11,289
)
 
971

 
(31
)
(10,349
)
Balance at End of Period
$
1,270

 
$
(6,284
)
 
$
(28,892
)
$
(33,906
)
 
 
 
 
 
 
 
Year Ended December 31, 2015
 
 
 
 
 
 
Balance at Beginning Period
$
15,984

 
$
(8,555
)
 
$
(34,115
)
$
(26,686
)
Other Comprehensive Income (Loss) Before Reclassifications
(3,310
)
 
—

 
4,466

1,156

Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)
(115
)
 
1,300

 
788

1,973

Total Other Comprehensive Income (Loss)
(3,425
)
 
1,300

 
5,254

3,129

Balance at End of Period
$
12,559

 
$
(7,255
)
 
$
(28,861
)
$
(23,557
)
Reclassification out of accumulated other comprehensive income
The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss):
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
(dollars in thousands)
Year Ended December 31,
 
 
2017

 
2016

 
2015

 
Amortization of Unrealized Holding Gains (Losses) on
     Investment Securities Held-to-Maturity
$
(1,982
)
 
$
(1,605
)
 
$
(2,136
)
Interest Income
 
783

 
634

 
836

Provision for Income Tax
 
(1,199
)
 
(971
)
 
(1,300
)
Net of Tax
Sales of Investment Securities Available-for-Sale
—

 
—

 
190

Investment Securities Gains (Losses), Net
 
—

 
—

 
(75
)
Provision for Income Tax
 
—

 
—

 
115

Net of Tax
 
 
 
 
 
 
 
Amortization of Defined Benefit Plans Items
 
 
 
 
 
 
  Prior Service Credit 2
322

 
322

 
322

 
  Net Actuarial Losses 2
(1,382
)
 
(1,224
)
 
(1,624
)
 
 
(1,060
)
 
(902
)
 
(1,302
)
Total Before Tax
 
418

 
356

 
514

Provision for Income Tax
 
(642
)
 
(546
)
 
(788
)
Net of Tax
 
 
 
 
 
 
 
Total Reclassifications for the Period
$
(1,841
)
 
$
(1,517
)
 
$
(1,973
)
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 Salaries and Benefits on the consolidated statements of income. See Note 14 Employee Benefits for additional details.