Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Current period other comprehensive other income, Retirement plans	$ 340	$ 387	$ 892	$ 1,159
TOTAL Balance	(19,146)	(9,338)	(7,472)	(10,494)
Change in Other comprehensive income before reclassification	(2,322)	1,884	(14,544)	2,657
Amounts reclassified from accumulated other comprehensive income	340	377	888	760
Net Current period other comprehensive other income	(1,982)	2,261	(13,656)	3,417
TOTAL Balance	(21,128)	(7,077)	(21,128)	(7,077)
Retirement plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,Retirement plans	(20,351)	(22,462)	(20,903)	(23,234)
Change in Other comprehensive income before reclassification, Retirement plans	0	0	0	0
Amounts reclassified from accumulated other comprehensive income, Retirement plans	340	387	892	1,159
Net Current period other comprehensive other income, Retirement plans	340	387	892	1,159
Ending balance, Retirement plans	(20,011)	(22,075)	(20,011)	(22,075)
Unrealized gains and Losses on available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Unrealized gains and Losses on available-for-sale Securities	1,205	13,124	13,431	12,740
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(2,322)	1,884	(14,544)	2,657
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	0	(10)	(4)	(399)
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(2,322)	1,874	(14,548)	2,258
Ending balance, Unrealized gains and Losses on available-for-sale Securities	$ (1,117)	$ 14,998	$ (1,117)	$ 14,998