Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (9,210)	[1]		$ 20,149	[1]
Other comprehensive loss before reclassifications	5,943	[1]		(23,236)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	59	[1],[2]		(121)	[1],[2]
Net current-period other comprehensive loss	6,002	[1]	2,644	(23,357)	[1]	3,345
Ending balance	(3,208)	[1]		(3,208)	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(7,804)	[1]		20,918	[1]
Other comprehensive loss before reclassifications	5,943	[1]		(22,480)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	0	[1],[2]		(299)	[1],[2]
Net current-period other comprehensive loss	5,943	[1]		(22,779)	[1]
Ending balance	(1,861)	[1]		(1,861)	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,406)	[1]		(769)	[1]
Other comprehensive loss before reclassifications	0	[1]		(756)	[1]
Amounts reclassified from accumulated other comprehensive income (2)	59	[1],[2]		178	[1],[2]
Net current-period other comprehensive loss	59	[1]		(578)	[1]
Ending balance	$ (1,347)	[1]		$ (1,347)	[1]

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

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