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Pension and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Changes in Benefit Obligations and Plan Assets: 
 
SERP I & SERP II
 
PRBP
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Change in benefit obligations
 
 
 
 
 
 
 
Benefit obligation at January 1
$
4,983

 
$
4,786

 
$
353

 
$
418

Service cost
—

 
—

 
—

 
—

Interest cost
160

 
176

 
9

 
11

Plan participants contribution
—

 
—

 
44

 
44

Actuarial loss (gain)
(180
)
 
282

 
(61
)
 
(9
)
Settlements
—

 
—

 
—

 
—

Benefits paid
(276
)
 
(261
)
 
(104
)
 
(111
)
Benefit obligation at December 31
$
4,687

 
$
4,983

 
$
241

 
$
353

Change in plan assets
 
 
 
 
 
 
 
Fair value of plan assets at January 1
$
—

 
$
—

 
$
—

 
$
—

Actual return on plan assets
—

 
—

 
—

 
—

Settlements
—

 
—

 
—

 
—

Excess assets transferred to defined contribution plan
—

 
—

 
—

 
—

Employer contribution
278

 
261

 
60

 
67

Plan participants’ contribution
—

 
—

 
44

 
44

Benefits paid
(278
)
 
(261
)
 
(104
)
 
(111
)
Fair value of plan assets at December 31
$
—

 
$
—

 
$
—

 
$
—

Funded status at year end (plan assets less benefit obligations)
$
(4,687
)
 
$
(4,983
)
 
$
(241
)
 
$
(353
)
 
 
For the Year Ended December 31,
 
SERP I & SERP II
 
PRBP
Amounts included in the Consolidated Balance Sheet as Other liabilities and accumulated other comprehensive income including the following:
2018
 
2017
 
2018
 
2017
Accrued liability
$
(3,174
)
 
$
(3,221
)
 
$
(129
)
 
$
(149
)
Net actuarial loss
(1,513
)
 
(1,762
)
 
(112
)
 
(204
)
Prior service cost
—

 
—

 
—

 
—

Unrecognized net initial obligation
—

 
—

 
—

 
—

Net included in Other liabilities in the Consolidated Balance Sheets
$
(4,687
)
 
$
(4,983
)
 
$
(241
)
 
$
(353
)
Schedule of Net Benefit Costs
The following tables provide the components of net periodic pension costs for the periods indicated:
SERP I and SERP II Periodic Pension Cost
For the Year Ended December 31,
(dollars in thousands)
2018
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

Interest cost
160

 
176

 
184

Amortization of prior service cost
—

 
—

 
—

Recognition of net actuarial loss
70

 
59

 
57

Net periodic pension cost
$
230

 
$
235

 
$
241

 
PRBP Net Periodic Pension Cost
For the Year Ended December 31,
(dollars in thousands)
2018
 
2017
 
2016
Service cost
$
—

 
$
—

 
$
—

Interest cost
9

 
11

 
17

Amortization of prior service cost
—

 
—

 
—

Recognition of net actuarial loss
30

 
36

 
41

Net periodic pension cost
$
39

 
$
47

 
$
58
Schedule of Assumptions Used
Actuarial Assumptions used to determine benefit obligations as of December 31 of the years indicated:
 
SERP I and SERP II
 
PRBP
 
2018
 
2017
 
2018
 
2017
Discount rate
3.95
%
 
3.30
%
 
3.45
%
 
2.75
%
Rate of increase for future compensation
N/A

 
N/A

 
N/A

 
N/A

Expected long-term rate of return on plan assets
N/A

 
N/A

 
N/A

 
N/A

 
For the Year Ended December 31,
Discount Rate Used in the Calculation of Periodic Pension Costs
2018
 
2017
 
2016
SERP I and SERP II
3.30
%
 
3.75
%
 
3.90
%
PRBP
2.75
%
 
2.80
%
 
3.90
%
Schedule of Expected Benefit Payments
The following benefit payments, which reflect expected future service, are expected to be paid over the next ten years:
 
(dollars in thousands)
 
SERP I & SERP II
 
PRBP
Fiscal year ending
 
 
 
 
2019
 
$
286

 
$
49

2020
 
$
286

 
$
42

2021
 
$
283

 
$
36

2022
 
$
280

 
$
31

2023
 
$
355

 
$
26

2024-2028
 
$
1,711

 
$
71