Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
TOTAL Balance	$ (8,551)	$ (8,925)	$ (13,969)	$ (7,472)
Change in Other comprehensive income before reclassification	4,115	(10,557)	9,418	(12,222)
Amounts reclassified from accumulated other comprehensive income	116	336	231	548
Net Current period other comprehensive other income	4,231	(10,221)	9,649	(11,674)
TOTAL Balance	(4,320)	(19,146)	(4,320)	(19,146)
Retirement plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance,Retirement plans	(10,219)	(20,689)	(10,334)	(20,903)
Change in Other comprehensive income before reclassification, Retirement plans	0	0	0	0
Amounts reclassified from accumulated other comprehensive income, Retirement plans	115	338	230	552
Net Current period other comprehensive other income, Retirement plans	115	338	230	552
Ending balance, Retirement plans	(10,104)	(20,351)	(10,104)	(20,351)
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	1,668	11,764	(3,635)	13,431
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	4,115	(10,557)	9,418	(12,222)
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	1	(2)	1	(4)
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	4,116	(10,559)	9,419	(12,226)
Ending balance, Unrealized gains and Losses on available-for-sale Securities	$ 5,784	$ 1,205	$ 5,784	$ 1,205