Other Comprehensive Income (Loss) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	$ (8,357)	$ 26,356
Other comprehensive (loss) income before reclassifications	5,290	(3,278)
Amounts reclassified from accumulated other comprehensive (loss) income	(56)	(220)
Net current-period other comprehensive loss (income)	5,234	(3,498)
Ending Balance	(3,123)	22,858
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Roll Forward]
Beginning Balance	(16,762)	(28,462)
Other comprehensive (loss) income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	200	409
Net current-period other comprehensive loss (income)	200	409
Ending Balance	(16,562)	(28,053)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Beginning Balance	(25,119)	(2,106)
Other comprehensive (loss) income before reclassifications	5,290	(3,278)
Amounts reclassified from accumulated other comprehensive (loss) income	144	189
Net current-period other comprehensive loss (income)	5,434	(3,089)
Ending Balance	$ (19,685)	$ (5,195)