Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amounts reclassified from accumulated other comprehensive income	$ 336	$ 10	$ 548	$ 383
Net Current period other comprehensive other income, Retirement plans	338	402	552	772
TOTAL Balance	(8,925)	(10,082)	(7,472)	(10,494)
Change in Other comprehensive income before reclassification	(10,557)	734	(12,222)	773
Net Current period other comprehensive other income	(10,221)	744	(11,674)	1,156
TOTAL Balance	(19,146)	(9,338)	(19,146)	(9,338)
Retirement plans [Member]
Beginning balance,Retirement plans	(20,689)	(22,864)	(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	338	402	552	772
Net Current period other comprehensive other income, Retirement plans	338	402	552	772
Ending balance, Retirement plans	(20,351)	(22,462)	(20,351)	(22,462)
Unrealized gains and Losses on available-for-sale Securities [Member]
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(10,557)	734	(12,222)	773
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(10,559)	342	(12,226)	384
Ending balance, Unrealized gains and Losses on available-for-sale Securities	1,205	13,124	1,205	13,124
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(2)	(392)	(4)	(389)
Beginning balance, Unrealized gains and Losses on available-for-sale Securities	$ 11,764	$ 12,782	$ 13,431	$ 12,740