Pension and Other Post Retirement Benefit Plans - Schedule of Changes in Benefit Obligation, and Plan Assets, Funded Status of the Plan, Assets and Liabilities Recognized in the Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 82,157	$ 84,090
Service cost	8	10	$ 9
Interest cost	2,816	3,353	3,273
Actuarial (gain) loss	(6,129)	3,686
Benefits paid	(5,659)	(5,179)
Plan settlements		(3,803)
Benefit obligation at end of year	73,193	82,157	84,090
Change in Plan Assets:
Fair value of plan assets at beginning of year	85,213	83,557
Actual return on plan assets	(3,427)	9,968
Employer contributions	609	670
Benefits paid	(5,659)	(5,179)
Plan settlements		(3,803)
End of year	76,736	85,213	$ 83,557
Funded status at end of year	3,543	3,056
Assets and Liabilities Recognized in the Balance Sheets:
Deferred tax asset	3,855	3,474
Assets	7,024	7,660
Liabilities	3,481	4,604
Amounts Recognized in Accumulated Other Comprehensive Income Not Yet Recognized as Components of Net Periodic Cost, net of tax, consist of:
Accumulated loss	(14,111)	(10,360)
Prior service cost	(409)	(393)
Total	$ (14,520)	$ (10,753)