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Supplemental Comprehensive Income Disclosures (Tables)
 3 Months Ended
Mar. 31, 2018
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,
 
2018
 
2017
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
Pretax Amount
 
Tax (Expense) Benefit
 
Net of Tax Amount
 
(dollars in thousands)
Unrealized (losses) gains on securities:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains on securities arising during the period
$
(3,982
)
 
$
837

 
$
(3,145
)
 
$
2,543

 
$
(890
)
 
$
1,653

Reclassification adjustment for gains on securities included in net income
(2,840
)
 
596

 
(2,244
)
 
(652
)
 
228

 
(424
)
Total unrealized (losses) gains on securities
(6,822
)
 
1,433

 
(5,389
)
 
1,891

 
(662
)
 
1,229

Unrealized losses on derivatives:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding losses on derivatives arising during the period
(130
)
 
27

 
(103
)
 
(516
)
 
181

 
(335
)
Reclassification adjustment for losses on derivatives included in net income
—

 
—

 
—

 
78

 
(28
)
 
50

Total unrealized losses on derivatives
(130
)
 
27

 
(103
)
 
(438
)
 
153

 
(285
)
Total other comprehensive (loss) income
$
(6,952
)
 
$
1,460

 
$
(5,492
)
 
$
1,453

 
$
(509
)
 
$
944

 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table details the change in components of OCI for the three months ended March 31:
 
2018
 
2017
 
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
$
(6,166
)
$
299

$
(306
)
$
(6,173
)
 
$
(7,455
)
$
225

$
203

$
(7,027
)
Cumulative effect of adoption of ASU 2018-02
(1,344
)
—

—

(1,344
)
 
—

—

—

—

Balance at January 1
(7,510
)
299

(306
)
(7,517
)
 
(7,455
)
225

203

(7,027
)
Other comprehensive (loss) income before reclassification adjustment
(3,145
)
—

(103
)
(3,248
)
 
1,653

—

(335
)
1,318

Amounts reclassified from accumulated other comprehensive (loss) income
(2,244
)
—

—

(2,244
)
 
(424
)
—

50

(374
)
Net other comprehensive (loss) income during the period
(5,389
)
—

(103
)
(5,492
)
 
1,229

—

(285
)
944

Balance at March 31
$
(12,899
)
$
299

$
(409
)
$
(13,009
)
 
$
(6,226
)
$
225

$
(82
)
$
(6,083
)