Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 3,560	[1]	$ (9,210)	[1]	$ (12,044)	[1]	$ 20,149	[1]
Other comprehensive loss before reclassifications	(4,057)	[1]	5,943	[1]	11,830	[1]	(23,236)	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	2	[1],[2]	59	[1],[2]	(281)	[1],[2]	(121)	[1],[2]
Net current-period other comprehensive income (loss)	(4,055)	[1]	6,002	[1]	11,549	[1]	(23,357)	[1]
Ending balance	(495)	[1]	(3,208)	[1]	(495)	[1]	(3,208)	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	5,448	[1]	(7,804)	[1]	(10,108)	[1]	20,918	[1]
Other comprehensive loss before reclassifications	(4,057)	[1]	5,943	[1]	11,830	[1]	(22,480)	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	(21)	[1],[2]	0	[1],[2]	(352)	[1],[2]	(299)	[1],[2]
Net current-period other comprehensive income (loss)	(4,078)	[1]	5,943	[1]	11,478	[1]	(22,779)	[1]
Ending balance	1,370	[1]	(1,861)	[1]	1,370	[1]	(1,861)	[1]
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,888)	[1]	(1,406)	[1]	(1,936)	[1]	(769)	[1]
Other comprehensive loss before reclassifications	0	[1]	0	[1]	0	[1]	(756)	[1]
Amounts reclassified from accumulated other comprehensive income (loss) (2)	23	[1],[2]	59	[1],[2]	71	[1],[2]	178	[1],[2]
Net current-period other comprehensive income (loss)	23	[1]	59	[1]	71	[1]	(578)	[1]
Ending balance	$ (1,865)	[1]	$ (1,347)	[1]	$ (1,865)	[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.