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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [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:
 
2017
 
2016
 
2015
 
(dollars in thousands)
Service cost
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
49

 
67

 
62

Amortization of transition obligation
—

 
—

 
—

Gain amortization
(21
)
 
(7
)
 
(4
)
Net periodic benefit cost
$
28

 
$
60

 
$
58
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:
 
2017
 
2016
 
(dollars in thousands)
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
1,394

 
$
1,815

Service cost
—

 
—

Interest cost
49

 
67

Amendments
—

 
—

Actuarial gain
(116
)
 
(337
)
Net benefits paid
(133
)
 
(151
)
Benefit obligation at end of year
1,194

 
1,394

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

 
—

Actual return on plan assets
—

 
—

Employer contributions
133

 
151

Net benefits paid
(133
)
 
(151
)
Fair value of plan assets at end of year
—

 
—

Funded Status at End of Year
1,194

 
1,394

Unrecognized transition obligation
—

 
—

Unrecognized net gain
440

 
345

Amounts recognized in retained earnings
$
1,634

 
$
1,739
Schedule of Amounts Recognized as Other Liabilities
As of December 31, the funded status of the plan is:
 
2017
 
2016
 
(dollars in thousands)
Amounts Recognized in the Statement of Financial Condition as Other liabilities
$
1,194

 
$
1,394
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.
 
2017
 
2016
 
2015
 
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
$
7,023

 
$
(2,458
)
 
$
4,565

 
$
(6,304
)
 
$
2,206

 
$
(4,098
)
 
$
2,798

 
$
(978
)
 
$
1,820

Reclassification adjustment for (gains) losses on securities included in net income
(5,040
)
 
1,764

 
(3,276
)
 
(617
)
 
216

 
(401
)
 
153

 
(54
)
 
99

Total unrealized gains (losses) on securities
1,983

 
(694
)
 
1,289

 
(6,921
)
 
2,422

 
(4,499
)
 
2,951

 
(1,032
)
 
1,919

Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding (losses) gains on derivatives arising during the period
(901
)
 
315

 
(586
)
 
(479
)
 
168

 
(311
)
 
450

 
(158
)
 
292

Reclassification adjustment for losses (gains) on derivatives included in net income
119

 
(42
)
 
77

 
(70
)
 
24

 
(46
)
 
(49
)
 
17

 
(32
)
Total unrealized (losses) gains on derivatives
(782
)
 
273

 
(509
)
 
(549
)
 
192

 
(357
)
 
401

 
(141
)
 
260

Unrealized gains (losses) for postretirement obligations:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net gain (loss)
94

 
(20
)
 
74

 
331

 
(116
)
 
215

 
(102
)
 
36

 
(66
)
Total unrealized gains (losses) for postretirement obligations
94

 
(20
)
 
74

 
331

 
(116
)
 
215

 
(102
)
 
36

 
(66
)
Total other comprehensive income (loss)
$
1,295

 
$
(441
)
 
$
854

 
$
(7,139
)
 
$
2,498

 
$
(4,641
)
 
$
3,250

 
$
(1,137
)
 
$
2,113

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:
 
2017
 
2016
 
2015
 
(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
 
 
 
 
 
Net (gain) loss
$
(347
)
 
$
(225
)
 
$
(10
)
Transition obligation
—

 
—

 
—

Total
$
(347
)
 
$
(225
)
 
$
(10
)
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:
 
2017
 
2016
 
2015
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.37
%
 
3.74
%
 
3.88
%
Health care cost trend: Initial
6.00
%
 
6.00
%
 
6.25
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2023

 
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:
 
2017
 
2016
 
2015
Weighted-average Assumptions
 
 
 
 
 
Discount rate
3.37
%
 
3.74
%
 
3.88
%
Health care cost trend: Initial
6.00
%
 
6.00
%
 
6.25
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2023

 
2022

 
2022


Weighted-average assumptions used to determine the net benefit costs as of December 31 are as follows: 
 
2017
 
2016
 
2015
Weighted Average Assumptions for Net Periodic Cost
 
 
 
 
 
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

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

 
11.0

 
11.0
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
$
29

 
$
(27
)
Effect on total of service and interest cost components
2

 
(2
)
Schedule of Projected Benefit Payments
As of December 31, 2017, the projected benefit payments for the next ten years are as follows:
 
Projected Benefit
        Payments         
 
(dollars in thousands)
2018
$
152

2019
128

2020
122

2021
115

2022
107

2023 - 2027
422
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 2018 are as follows (dollars in thousands):
 
Postretirement
Benefits
 
(dollars in thousands)
Net gain
$
(35
)
Transition obligation
—

Total
$
(35
)