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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
 
2014
 
(dollars in thousands)
Service cost
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
67

 
62

 
62

Amortization of transition obligation
—

 
—

 
—

Gain amortization
(7
)
 
(4
)
 
(29
)
Net periodic benefit cost
$
60

 
$
58

 
$
33
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:
 
2016
 
2015
 
(dollars in thousands)
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
1,815

 
$
1,822

Service cost
—

 
—

Interest cost
67

 
62

Amendments
—

 
—

Actuarial loss (gain)
(337
)
 
98

Net benefits paid
(151
)
 
(167
)
Benefit obligation at end of year
1,394

 
1,815

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

 
—

Actual return on plan assets
—

 
—

Employer contributions
151

 
167

Net benefits paid
(151
)
 
(167
)
Fair value of plan assets at end of year
—

 
—

Funded Status at End of Year
1,394

 
1,815

Unrecognized transition obligation
—

 
—

Unrecognized net gain
345

 
15

Amounts recognized in retained earnings
$
1,739

 
$
1,830
Schedule of Amounts Recognized as Other Liabilities
As of December 31, the funded status of the plan is:
 
2016
 
2015
 
(dollars in thousands)
Amounts Recognized in the Statement of Financial Condition as Other liabilities
$
1,394

 
$
1,815
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
)
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:
 
2016
 
2015
 
2014
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.74
%
 
3.88
%
 
3.61
%
Health care cost trend: Initial
6.00
%
 
6.25
%
 
6.50
%
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:
 
2016
 
2015
 
2014
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.74
%
 
3.88
%
 
3.61
%
Health care cost trend: Initial
6.00
%
 
6.25
%
 
6.50
%
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: 
 
2016
 
2015
 
2014
Weighted Average Assumptions for Net Periodic Cost
 
 
 
 
 
Discount rate
3.88
%
 
3.61
%
 
4.01
%
Health care cost trend: Initial
6.25
%
 
6.50
%
 
6.75
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2022

 
2022

 
2022

Corridor
10.00
%
 
10.00
%
 
10.00
%
Recognition period for gains and losses
11.0

 
11.0

 
10.0
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
$
44

 
$
(40
)
Effect on total of service and interest cost components
3

 
(3
)
Schedule of Projected Benefit Payments
As of December 31, 2016, the projected benefit payments for the next ten years are as follows:
 
Projected Benefit
        Payments         
 
(dollars in thousands)
2017
$
174

2018
162

2019
137

2020
130

2021
123

2022 - 2026
500
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 2017 are as follows (dollars in thousands):
 
Postretirement
Benefits
 
(dollars in thousands)
Net gain
$
21

Transition obligation
—

Total
$
21