Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (12,044)	[1]	$ 20,149	[1]
Other comprehensive income before reclassifications	7,119	[1]	(3,250)	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	(118)	[1],[2]	(180)	[1],[2]
Net current-period other comprehensive income	7,001	[1]	(3,430)	[1]
Ending balance	(5,043)	[1]	16,719	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(10,108)	[1]	20,918	[1]
Other comprehensive income before reclassifications	7,119	[1]	(2,493)	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	(142)	[1],[2]	(240)	[1],[2]
Net current-period other comprehensive income	6,977	[1]	(2,733)	[1]
Ending balance	(3,131)	[1]	18,185	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,936)	[1]	(769)	[1]
Other comprehensive income before reclassifications	0	[1]	(757)	[1]
Amounts reclassified from accumulated other comprehensive loss (2)	24	[1],[2]	60	[1],[2]
Net current-period other comprehensive income	24	[1]	(697)	[1]
Ending balance	$ (1,912)	[1]	$ (1,466)	[1]

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

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