Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 20,149	[1]
Other comprehensive income before reclassifications	(3,250)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	(180)	[1],[2]
Net current-period other comprehensive income	(3,430)	[1]
Ending balance	16,719	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	20,918	[1]
Other comprehensive income before reclassifications	(2,493)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	(240)	[1],[2]
Net current-period other comprehensive income	(2,733)	[1]
Ending balance	18,185	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(769)	[1]
Other comprehensive income before reclassifications	(757)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	60	[1],[2]
Net current-period other comprehensive income	(697)	[1]
Ending balance	$ (1,466)	[1]

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.

[2] See following table for details about these reclassifications.