Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 16,719	[1]	$ 20,149	[1]
Other comprehensive loss before reclassifications	(25,930)	[1]	(29,179)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	1	[1],[2]	(180)	[1],[2]
Net current-period other comprehensive loss	(25,929)	[1]	(29,359)	[1]
Ending balance	(9,210)	[1]	(9,210)	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	18,185	[1]	20,918	[1]
Other comprehensive loss before reclassifications	(25,930)	[1]	(28,423)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	(59)	[1],[2]	(299)	[1],[2]
Net current-period other comprehensive loss	(25,989)	[1]	(28,722)	[1]
Ending balance	(7,804)	[1]	(7,804)	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,466)	[1]	(769)	[1]
Other comprehensive loss before reclassifications	0	[1]	(756)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	60	[1],[2]	119	[1],[2]
Net current-period other comprehensive loss	60	[1]	(637)	[1]
Ending balance	$ (1,406)	[1]	$ (1,406)	[1]

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

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