Pension Plans and Other Postretirement Benefits (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of year	$ 34,279	$ 39,483	$ 40,994
Service cost	450	360	360
Interest cost	1,189	1,679	1,369
Plan amendments	0	0	0
Actuarial loss (gain)	(1,371)	1,254	624
Benefits paid	(3,314)	(1,737)	(1,715)
Settlements	0	(6,760)	(2,149)
Projected benefit obligation at end of year	31,233	34,279	39,483
Change in plan assets:
Fair value of plan assets at beginning of year	31,408	35,879	32,757
Actual return on plan assets	200	2,535	4,396
Employer contributions	0	2,000	3,103
Benefits paid	(3,314)	(1,737)	(1,715)
Expenses paid	(627)	(509)	(513)
Settlements	0	(6,760)	(2,149)
Fair value of plan assets at end of year	27,667	31,408	35,879
Funded status	(3,566)	(2,871)	(3,604)
Prepaid (accrued) benefit expense	9,265	10,656	12,331
Total amount recognized in Consolidated Balance Sheets, all in Other Liabilities	(3,566)	(2,871)	(3,604)
Amounts recognized in accumulated other comprehensive income (loss) (“AOCI”):
Prior service cost	0	0	0
Net actuarial loss	12,831	13,527	15,935
Total amount recognized in AOCI	12,831	13,527	15,935
Information for pension plans with an accumulated benefit obligation greater than plan assets:
Projected benefit obligation	31,233	34,279	39,483
Accumulated benefit obligation	31,233	34,279	39,483
Fair value of plan assets	27,667	31,408	35,879
Supplemental Defined Benefit Plans [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of year	18,524	16,706	18,192
Service cost	0	0	0
Interest cost	654	716	616
Plan amendments	0	0	0
Actuarial loss (gain)	(845)	2,431	(783)
Benefits paid	(1,329)	(1,329)	(1,319)
Settlements	0	0	0
Projected benefit obligation at end of year	17,004	18,524	16,706
Change in plan assets:
Fair value of plan assets at beginning of year	0	0	0
Actual return on plan assets	0	0	0
Employer contributions	1,329	1,329	1,319
Benefits paid	(1,329)	(1,329)	(1,319)
Expenses paid	0	0	0
Settlements	0	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(17,004)	(18,524)	(16,706)
Prepaid (accrued) benefit expense	(11,622)	(12,024)	(12,479)
Total amount recognized in Consolidated Balance Sheets, all in Other Liabilities	(17,004)	(18,524)	(16,706)
Amounts recognized in accumulated other comprehensive income (loss) (“AOCI”):
Prior service cost	0	0	0
Net actuarial loss	5,382	6,500	4,227
Total amount recognized in AOCI	5,382	6,500	4,227
Information for pension plans with an accumulated benefit obligation greater than plan assets:
Projected benefit obligation	17,004	18,524	16,706
Accumulated benefit obligation	17,004	18,524	16,706
Fair value of plan assets	$ 0	$ 0	$ 0