Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013 Unrealized gains (losses) on available for sale securities [Member]	Dec. 31, 2012 Unrealized gains (losses) on available for sale securities [Member]	Jun. 30, 2013 Defined benefit plan items [Member]	Dec. 31, 2012 Defined benefit plan items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (323)	[1]			$ 3,650		$ (3,973)
Other comprehensive income before reclassifications	(12,976)					(12,976)		0
Amounts reclassified from accumulated other comprehensive income	(1,955)					(1,647)		(308)
Net current period other comprehensive income	(10,354)	1,251	(14,931)		1,981	(14,623)		(308)
Ending balance	$ (15,254)		$ (15,254)			$ (10,973)	$ 3,650	$ (4,281)	$ (3,973)

[1] Derived from audited consolidated financial statements