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, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 80,650	$ 62,270
Service cost	55	73	$ 131
Interest cost	3,087	3,235	2,670
Actuarial loss (gain)	(5,617)	12,968
Benefits paid	$ (6,428)	(5,541)
Net transfers in from CFS acquisition		7,645
Benefit obligation at end of year	$ 71,747	80,650	62,270
Change in Plan Assets:
Fair value of plan assets at beginning of year	77,139	69,871
Actual return on plan assets	153	5,232
Employer contributions	532	504
Benefits paid	$ (6,428)	(5,541)
CFS acquisition		7,073
End of year	$ 71,396	77,139	$ 69,871
Funded status at end of year	(351)	(3,511)
Assets and Liabilities Recognized in the Balance Sheets:
Deferred tax asset	7,461	8,541
Assets	4,006	1,329
Liabilities	4,357	4,840
Amounts Recognized in Accumulated Other Comprehensive Income Not Yet Recognized as Components of Net Periodic (Benefit) Cost Consist of:
Accumulated loss	(13,857)	(15,863)
Prior service credit	(305)	(346)
Total	$ (14,162)	$ (16,209)