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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
2018
 
2017
 
2016
 
(dollars in thousands)
Service cost
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
38

 
49

 
67

Amortization of transition obligation
—

 
—

 
—

Gain amortization
(35
)
 
(21
)
 
(7
)
Net periodic benefit cost
$
3

 
$
28

 
$
60
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:
 
2018
 
2017
 
(dollars in thousands)
Change in Benefit Obligation
 
 
 
Benefit obligation at beginning of year
$
1,188

 
$
1,394

Service cost
—

 
—

Interest cost
38

 
49

Amendments
—

 
—

Actuarial gain
(174
)
 
(116
)
Net benefits paid
(169
)
 
(133
)
Benefit obligation at end of year
883

 
1,194

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

 
—

Actual return on plan assets
—

 
—

Employer contributions
169

 
133

Net benefits paid
(169
)
 
(133
)
Fair value of plan assets at end of year
—

 
—

Funded Status at End of Year
883

 
1,194

Unrecognized transition obligation
—

 
—

Unrecognized net gain
584

 
440

Amounts recognized in retained earnings
$
1,467

 
$
1,634
Schedule of Amounts Recognized as Other Liabilities
As of December 31, the funded status of the plan is:
 
2018
 
2017
 
(dollars in thousands)
Amounts Recognized in the Statement of Financial Condition as Other liabilities
$
883

 
$
1,194
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 Consolidated Statements of Income.
 
2018
 
2017
 
2016
 
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
$
2,783

 
$
(585
)
 
$
2,198

 
$
7,023

 
$
(2,458
)
 
$
4,565

 
$
(6,304
)
 
$
2,206

 
$
(4,098
)
Reclassification adjustment for gains on securities included in net income
(8,102
)
 
1,701

 
(6,401
)
 
(5,040
)
 
1,764

 
(3,276
)
 
(617
)
 
216

 
(401
)
Total unrealized (losses) gains on securities
(5,319
)
 
1,116

 
(4,203
)
 
1,983

 
(694
)
 
1,289

 
(6,921
)
 
2,422

 
(4,499
)
Unrealized gains (losses) on derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized holding gains (losses) on derivatives arising during the period
326

 
(68
)
 
258

 
(901
)
 
315

 
(586
)
 
(479
)
 
168

 
(311
)
Reclassification adjustment for losses (gains) on derivatives included in net income
10

 
(3
)
 
7

 
119

 
(42
)
 
77

 
(70
)
 
24

 
(46
)
Total unrealized gains (losses) on derivatives
336

 
(71
)
 
265

 
(782
)
 
273

 
(509
)
 
(549
)
 
192

 
(357
)
Unrealized gains for postretirement obligations:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net gain
144

 
(30
)
 
114

 
94

 
(20
)
 
74

 
331

 
(116
)
 
215

Total unrealized gains for postretirement obligations
144

 
(30
)
 
114

 
94

 
(20
)
 
74

 
331

 
(116
)
 
215

Total other comprehensive (loss) income
$
(4,839
)
 
$
1,015

 
$
(3,824
)
 
$
1,295

 
$
(441
)
 
$
854

 
$
(7,139
)
 
$
2,498

 
$
(4,641
)
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:
 
2018
 
2017
 
2016
 
(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
 
 
 
 
 
Net (gain) loss
$
(461
)
 
$
(347
)
 
$
(225
)
Transition obligation
—

 
—

 
—

Total
$
(461
)
 
$
(347
)
 
$
(225
)
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:
 
2018
 
2017
 
2016
Weighted-Average Assumptions
 
 
 
 
 
Discount rate
4.11
%
 
3.37
%
 
3.74
%
Health care cost trend: Initial
6.00
%
 
6.00
%
 
6.00
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2024

 
2023

 
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:
 
2018
 
2017
 
2016
Weighted-Average Assumptions
 
 
 
 
 
Discount rate
4.11
%
 
3.37
%
 
3.74
%
Health care cost trend: Initial
6.00
%
 
6.00
%
 
6.00
%
Health care cost trend: Ultimate
4.75
%
 
4.75
%
 
4.75
%
Year ultimate reached
2024

 
2023

 
2022


Weighted-average assumptions used to determine the net benefit costs as of December 31 are as follows: 
 
2018
 
2017
 
2016
Weighted-Average Assumptions for Net Periodic Cost
 
 
 
 
 
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

Corridor
10.00
%
 
10.00
%
 
10.00
%
Recognition period for gains and losses
12.1

 
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
$
17

 
$
(15
)
Effect on total of service and interest cost components
1

 
(1
)
Schedule of Projected Benefit Payments
As of December 31, 2018, the projected benefit payments for the next ten years are as follows:
 
Projected Benefit
        Payments         
 
(dollars in thousands)
2019
$
109

2020
102

2021
97

2022
90

2023
84

2024 - 2028
328
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 2019 are as follows (dollars in thousands):
 
Postretirement
Benefits
 
(dollars in thousands)
Net gain
$
—

Transition obligation
(60
)
Total
$
(60
)