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Supplemental Comprehensive Income Disclosures (Tables)
 9 Months Ended
Sep. 30, 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 Nine Months Ended September 30,
 
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
$
(8,704
)
 
$
1,828

 
$
(6,876
)
 
$
5,935

 
$
(2,077
)
 
$
3,858

Reclassification adjustment for gains on securities included in net income
(8,102
)
 
1,701

 
(6,401
)
 
(695
)
 
243

 
(452
)
Total unrealized (losses) gains on securities
(16,806
)
 
3,529

 
(13,277
)
 
5,240

 
(1,834
)
 
3,406

Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains (losses) on derivatives arising during the period
165

 
(35
)
 
130

 
(631
)
 
221

 
(410
)
Reclassification adjustment for losses on derivatives included in net income
10

 
(3
)
 
7

 
93

 
(33
)
 
60

Total unrealized gains (losses) on derivatives
175

 
(38
)
 
137

 
(538
)
 
188

 
(350
)
Total other comprehensive (loss) income
$
(16,631
)
 
$
3,491

 
$
(13,140
)
 
$
4,702

 
$
(1,646
)
 
$
3,056

 
For the Three Months Ended September 30,
 
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
$
(5,382
)
 
$
1,130

 
$
(4,252
)
 
$
1,690

 
$
(591
)
 
$
1,099

Reclassification adjustment for gains on securities included in net income
—

 
—

 
—

 
(92
)
 
32

 
(60
)
Total unrealized (losses) gains on securities
(5,382
)
 
1,130

 
(4,252
)
 
1,598

 
(559
)
 
1,039

Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains (losses) on derivatives arising during the period
198

 
(42
)
 
156

 
(49
)
 
17

 
(32
)
Reclassification adjustment for losses on derivatives included in net income
—

 
—

 
—

 
20

 
(7
)
 
13

Total unrealized gains (losses) on derivatives
198

 
(42
)
 
156

 
(29
)
 
10

 
(19
)
Total other comprehensive (loss) income
$
(5,184
)
 
$
1,088

 
$
(4,096
)
 
$
1,569

 
$
(549
)
 
$
1,020
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table details the change in components of OCI for the nine months ended September 30:
 
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
(6,876
)
—

130

(6,746
)
 
3,858

—

(410
)
3,448

Amounts reclassified from accumulated other comprehensive (loss) income
(6,401
)
—

7

(6,394
)
 
(452
)
—

60

(392
)
Net other comprehensive (loss) income during the period
(13,277
)
—

137

(13,140
)
 
3,406

—

(350
)
3,056

Balance at September 30
$
(20,787
)
$
299

$
(169
)
$
(20,657
)
 
$
(4,049
)
$
225

$
(147
)
$
(3,971
)