Pension Plans (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation:
Benefit obligation at beginning of year	$ 9,982,000	$ 10,736,000
Interest cost	491,000	443,000	454,000
Actuarial loss (gain)	3,002,000	(1,013,000)
Benefits paid	(206,000)	(182,000)
Other	4,000	(2,000)
Benefit obligation at end of year	13,273,000	9,982,000	10,736,000
Change in plan assets:
Fair value of plan assets at beginning of year	7,797,000	7,024,000
Actual gain (loss) on plan assets	583,000	951,000
Employer contribution	40,000
Benefits paid	(206,000)	(182,000)
Other	4,000	4,000
Fair value of plan assets at end of year	8,218,000	7,797,000	7,024,000
Unfunded status	(5,055,000)	(2,185,000)
Amounts recognized in consolidated balance sheets
Accrued benefit cost	(897,000)	(729,000)
Liability for pension benefits	(4,158,000)	(1,456,000)
Total	(5,055,000)	(2,185,000)
Amounts recognized in accumulated other comprehensive loss that have not been recognized as components of net periodic (benefit) cost
Net actuarial loss, pre-tax	5,710,000	2,743,000
Defined Benefit Plan, Accumulated Benefit Obligation	13,273,000	9,982,000
Components of net periodic pension (benefit) cost
Interest cost	491,000	443,000	454,000
Expected return on plan assets	(612,000)	(552,000)	(508,000)
Recognized net actuarial loss	64,000	100,000	80,000
Net periodic pension cost	(57,000)	(9,000)	26,000
Amounts expected to recognized as components of net periodic benefit cost, which are included in accumulated other comprehensive loss
Actuarial loss	$ 123,000
Net Periodic Pension Cost
Weighted-average discount rate (as a percent)	5.00%	4.40%	5.00%
Expected long-term rate of return on plan assets (as a percent)	8.00%	8.00%	8.00%
Benefit Obligation
Weighted-average discount rate (as a percent)	4.10%	5.00%