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Supplemental Comprehensive Income Disclosures (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Comprehensive Income Disclosures [Abstract]  
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income
The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities gains (losses)” line in the Consolidated Statements of Income and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Consolidated Statements of Income.
 
2016
 
2015
 
2014
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
(dollars in thousands)
Unrealized gains (losses) on securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains on securities arising during the period
$
(6,304
)
 
$
2,206

 
$
(4,098
)
 
$
2,798

 
$
(978
)
 
$
1,820

 
$
25,153

 
$
(8,803
)
 
$
16,350

Reclassification adjustment for (gains) losses on securities included in net income
(617
)
 
216

 
(401
)
 
153

 
(54
)
 
99

 
(550
)
 
193

 
(357
)
Total unrealized (losses) gains on securities
(6,921
)
 
2,422

 
(4,499
)
 
2,951

 
(1,032
)
 
1,919

 
24,603

 
(8,610
)
 
15,993

Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains on derivatives arising during the period
(479
)
 
168

 
(311
)
 
450

 
(158
)
 
292

 
472

 
(165
)
 
307

Reclassification adjustment for gains on derivatives included in net income
(70
)
 
24

 
(46
)
 
(49
)
 
17

 
(32
)
 
(10
)
 
3

 
(7
)
Total unrealized (losses) gains on derivatives
(549
)
 
192

 
(357
)
 
401

 
(141
)
 
260

 
462

 
(162
)
 
300

Unrealized gains (losses) for postretirement obligations:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Transition obligation
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net gain (loss)
331

 
(116
)
 
215

 
(102
)
 
36

 
(66
)
 
(313
)
 
109

 
(204
)
Total unrealized gains (losses) for postretirement obligations
331

 
(116
)
 
215

 
(102
)
 
36

 
(66
)
 
(313
)
 
109

 
(204
)
Total other comprehensive (loss) income
$
(7,139
)
 
$
2,498

 
$
(4,641
)
 
$
3,250

 
$
(1,137
)
 
$
2,113

 
$
24,752

 
$
(8,663
)
 
$
16,089

The following table sets forth the amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit costs as of December 31:
 
2016
 
2015
 
2014
 
(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
 
 
 
 
 
Net (gain) loss
$
(225
)
 
$
(10
)
 
$
(76
)
Transition obligation
—

 
—

 
—

Total
$
(225
)
 
$
(10
)
 
$
(76
)
Related Tax Effects Allocated to Each Component of Other Comprehensive Income
The following table details the change in components of OCI for the year-ended December 31:

 
2016
 
Securities Available for Sale
 
Derivatives
 
Post-Retirement Obligation
 
Accumulated Other Comprehensive Income
 
(dollars in thousands)
Balance at January 1
$
(2,956
)
 
$
560

 
$
10

 
$
(2,386
)
Other comprehensive loss before reclassification adjustment
(4,098
)
 
(311
)
 
 
 
(4,409
)
Amounts reclassified from accumulated other comprehensive income (loss)
(401
)
 
(46
)
 
 
 
(447
)
Net gain
 
 
 
 
215

 
215

Net other comprehensive loss during the period
(4,499
)
 
(357
)
 
215

 
(4,641
)
Balance at December 31
$
(7,455
)
 
$
203

 
$
225

 
$
(7,027
)
 
 
 
 
 
 
 
 
 
2015
 
Securities Available for Sale
 
Derivatives
 
Post-Retirement Obligation
 
Accumulated Other Comprehensive Income
 
(dollars in thousands)
Balance at January 1
$
(4,875
)
 
$
300

 
$
76

 
$
(4,499
)
Other comprehensive income before reclassification adjustment
1,820

 
292

 
 
 
2,112

Amounts reclassified from accumulated other comprehensive income (loss)
99

 
(32
)
 
 
 
67

Net gain
 
 
 
 
(66
)
 
(66
)
Net other comprehensive income during the period
1,919

 
260

 
(66
)
 
2,113

Balance at December 31
$
(2,956
)
 
$
560

 
$
10

 
$
(2,386
)
 
 
 
 
 
 
 
 
 
2014
 
Securities Available for Sale
 
Derivatives
 
Post-Retirement Obligation
 
Accumulated Other Comprehensive Income
 
(dollars in thousands)
Balance at January 1
$
(20,868
)
 
$
—

 
$
280

 
$
(20,588
)
Other comprehensive income before reclassification adjustment
16,350

 
307

 
 
 
16,657

Amounts reclassified from accumulated other comprehensive income (loss)
(357
)
 
(7
)
 
 
 
(364
)
Net gain
 
 
 
 
(204
)
 
(204
)
Net other comprehensive income during the period
15,993

 
300

 
(204
)
 
16,089

Balance at December 31
$
(4,875
)
 
$
300

 
$
76

 
$
(4,499
)