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Supplemental Comprehensive Income Disclosures (Tables)
 3 Months Ended
Mar. 31, 2017
Supplemental Comprehensive Income Disclosures [Abstract]  
Supplemental Comprehensive Income Disclosures
The following table identifies the related tax effects allocated to each component of other comprehensive income (“OCI”) in the Condensed Consolidated Statements of Comprehensive Income. Reclassification adjustments related to securities available for sale are included in the "Net securities gains" line and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Condensed Consolidated Statements of Income.
 
For the Three Months Ended March 31,
 
2017
 
2016
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
(dollars in thousands)
Unrealized gains on securities:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains on securities arising during the period
$
2,543

 
$
(890
)
 
$
1,653

 
$
10,070

 
$
(3,524
)
 
$
6,546

Reclassification adjustment for gains on securities included in net income
(652
)
 
228

 
(424
)
 
—

 
—

 
—

Total unrealized gains on securities
1,891

 
(662
)
 
1,229

 
10,070

 
(3,524
)
 
6,546

Unrealized (losses) gains on derivatives:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains on derivatives arising during the period
(516
)
 
181

 
(335
)
 
1,735

 
(607
)
 
1,128

Reclassification adjustment for losses (gains) on derivatives included in net income
78

 
(28
)
 
50

 
(15
)
 
5

 
(10
)
Total unrealized (losses) gains on derivatives
(438
)
 
153

 
(285
)
 
1,720

 
(602
)
 
1,118

Total other comprehensive income
$
1,453

 
$
(509
)
 
$
944

 
$
11,790

 
$
(4,126
)
 
$
7,664


 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table details the change in components of OCI for the three months ended March 31:
 
2017
 
2016
 
Securities Available for Sale
Post-Retirement Obligation
Derivatives
Accumulated Other Comprehensive Income (Loss)
 
Securities Available for Sale
Post-Retirement Obligation
Derivatives
Accumulated Other Comprehensive Income (Loss)
 
(dollars in thousands)
Balance at December 31
$
(7,455
)
$
225

$
203

$
(7,027
)
 
$
(2,956
)
$
10

$
560

$
(2,386
)
Other comprehensive income before reclassification adjustment
1,653

—

(335
)
1,318

 
6,546

—

1,128

7,674

Amounts reclassified from accumulated other comprehensive (loss) income
(424
)
—

50

(374
)
 
—

—

(10
)
(10
)
Net other comprehensive income during the period
1,229

—

(285
)
944

 
6,546

—

1,118

7,664

Balance at March 31
$
(6,226
)
$
225

$
(82
)
$
(6,083
)
 
$
3,590

$
10

$
1,678

$
5,278