Other Comprehensive Income (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	$ 2,867		$ (8,357)
Other comprehensive income before reclassifications	5,592		5,290
Amounts reclassified from accumulated other comprehensive (loss) income	(174)	[1]	(56)	[1]
Net current-period other comprehensive loss (income)	5,418		5,234
Ending Balance	8,285		(3,123)
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	(26,878)		(16,762)
Amounts reclassified from accumulated other comprehensive (loss) income	331		200
Net current-period other comprehensive loss (income)	(331)	[1],[2]	(200)	[1],[2]
Ending Balance	(26,547)		(16,562)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Beginning Balance	(24,011)		(25,119)
Other comprehensive income before reclassifications	5,592		5,290
Amounts reclassified from accumulated other comprehensive (loss) income	157		144
Other comprehensive income	5,749		5,434
Ending Balance	$ (18,262)		$ (19,685)

[1] Amounts in parentheses indicated debits in income statement

[2] The accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit cost (See Note 10 - "Employee Benefit Plan")