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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
Net periodic benefit cost of these plans for the years ended December 31, was as follows:
 
2014
 
2013
 
2012
 
(dollars in thousands)
Service cost
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
62

 
62

 
75

Amortization of transition obligation
—

 
—

 
2

Gain amortization
(29
)
 
(7
)
 
(32
)
Net periodic benefit cost
$
33

 
$
55

 
$
45
Schedule of Changes in Benefit Obligations and Plan Assets
The following table sets forth the change in the benefit obligation and plan assets as of December 31:
 
2014
 
2013
 
(dollars in thousands)
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
1,644

 
$
1,986

Service cost
—

 
—

Interest cost
62

 
62

Amendments
—

 
—

Actuarial loss (gain)
284

 
(225
)
Net benefits paid
(168
)
 
(179
)
Benefit obligation at end of year
1,822

 
1,644

Change in Plan Assets
 
 
 
Fair value of plan assets at beginning of year
—

 
—

Actual return on plan assets
—

 
—

Employer contributions
168

 
179

Net benefits paid
(168
)
 
(179
)
Fair value of plan assets at end of year
—

 
—

Funded Status at End of Year
1,822

 
1,644

Unrecognized transition obligation
—

 
—

Unrecognized net gain
117

 
430

Amounts recognized in retained earnings
$
1,939

 
$
2,074
Schedule of Amounts Recognized as Other Liabilities
As of December 31, the funded status of the plan is:
 
2014
 
2013
 
(dollars in thousands)
Amounts Recognized in the Statement of Financial Condition as Other liabilities
$
1,822

 
$
1,644
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" 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 Condensed Consolidated Statements of Income.
 
2014
 
2013
 
2012
 
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 gains (losses) on securities arising during the period
$
25,153

 
$
(8,803
)
 
$
16,350

 
$
(34,975
)
 
$
12,233

 
$
(22,742
)
 
$
(661
)
 
$
238

 
$
(423
)
Reclassification adjustment for (gains) losses on securities included in net income
(550
)
 
193

 
(357
)
 
1,158

 
(405
)
 
753

 
(192
)
 
67

 
(125
)
Total unrealized gains (losses) on securities
24,603

 
(8,610
)
 
15,993

 
(33,817
)
 
11,828

 
(21,989
)
 
(853
)
 
305

 
(548
)
Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains on derivatives arising during the period
472

 
(165
)
 
307

 
—

 
—

 
—

 
—

 
—

 
—

Reclassification adjustment for gains on derivatives included in net income
(10
)
 
3

 
(7
)
 
—

 
—

 
—

 
—

 
—

 
—

Total unrealized gains on derivatives
462

 
(162
)
 
300

 
—

 
—

 
—

 
—

 
—

 
—

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

 
—

 
—

 
—

 
—

 
—

 
2

 
(1
)
 
1

Net (loss) gain
(313
)
 
109

 
(204
)
 
219

 
(77
)
 
142

 
(300
)
 
105

 
(195
)
Total unrealized (losses) gains for postretirement obligations
(313
)
 
109

 
(204
)
 
219

 
(77
)
 
142

 
(298
)
 
104

 
(194
)
Total other comprehensive income (loss)
$
24,752

 
$
(8,663
)
 
$
16,089

 
$
(33,598
)
 
$
11,751

 
$
(21,847
)
 
$
(1,151
)
 
$
409

 
$
(742
)
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:
 
2014
 
2013
 
2012
 
(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
 
 
 
 
 
Net (gain) loss
$
(76
)
 
$
(280
)
 
$
(138
)
Transition obligation
—

 
—

 
—

Total
$
(76
)
 
$
(280
)
 
$
(138
)
Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligation
Weighted-average assumptions used to determine the benefit obligation as of December 31 are as follows:
 
2014
 
2013
 
2012
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.61
%
 
4.01
%
 
3.31
%
Health care cost trend: Initial
6.50
%
 
6.75
%
 
7.00
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2022

 
2022

 
2022
Schedule of Weighted-Average Assumptions Used to Determine Net Periodic Cost
Weighted-average assumptions used to determine the benefit obligation as of December 31 are as follows:
 
2014
 
2013
 
2012
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.61
%
 
4.01
%
 
3.31
%
Health care cost trend: Initial
6.50
%
 
6.75
%
 
7.00
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2022

 
2022

 
2022


Weighted-average assumptions used to determine the net benefit costs as of December 31 are as follows: 
 
2014
 
2013
 
2012
Weighted Average Assumptions for Net Periodic Cost
 
 
 
 
 
Discount rate
4.01
%
 
3.31
%
 
4.22
%
Health care cost trend: Initial
6.75
%
 
7.00
%
 
8.00
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2022

 
2022

 
2016

Corridor
10.00
%
 
10.00
%
 
10.00
%
Recognition period for gains and losses
10.0

 
11.0

 
12.0
Schedule of Impact of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
The health care cost trend rate assumption can have a significant impact on the amounts reported for this plan. A one-percentage-point change in assumed health care cost trend rates would have the following effects:
 
One-Percentage-
Point Increase
 
One-Percentage-
Point Decrease
 
(dollars in thousands)
Effect on postretirement benefit obligation
$
74

 
$
(67
)
Effect on total of service and interest cost components
2

 
(2
)
Schedule of Projected Benefit Payments
As of December 31, 2014, the projected benefit payments for the next ten years are as follows:
 
Projected Benefit
        Payments         
 
(dollars in thousands)
2015
$
197

2016
192

2017
187

2018
172

2019
145

2020 - 2024
623
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income
The estimated costs that will be amortized from accumulated other comprehensive income into net periodic cost for 2015 are as follows (dollars in thousands):
 
Postretirement
Benefits
 
(dollars in thousands)
Net gain
$
(4
)
Transition obligation
—

Total
$
(4
)