Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	$ 14,286	$ (5,043)	$ 5,621	$ (12,044)
Other comprehensive loss before reclassifications	[1]	(11,341)	8,768	(2,245)	15,887
Amounts reclassified from accumulated other comprehensive income (loss) (2)	[1],[2]	(156)	(165)	(587)	(283)
Net current-period other comprehensive income (loss)	[1]	(11,497)	8,603	(2,832)	15,604
Ending balance	[1]	2,789	3,560	2,789	3,560
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	16,379	(3,131)	7,462	(10,108)
Other comprehensive loss before reclassifications	[1]	(11,341)	8,768	(1,965)	15,887
Amounts reclassified from accumulated other comprehensive income (loss) (2)	[1],[2]	(219)	(189)	(678)	(331)
Net current-period other comprehensive income (loss)	[1]	(11,560)	8,579	(2,643)	15,556
Ending balance	[1]	4,819	5,448	4,819	5,448
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(2,093)	(1,912)	(1,841)	(1,936)
Other comprehensive loss before reclassifications	[1]	0	0	(280)	0
Amounts reclassified from accumulated other comprehensive income (loss) (2)	[1],[2]	63	24	91	48
Net current-period other comprehensive income (loss)	[1]	63	24	(189)	48
Ending balance	[1]	$ (2,030)	$ (1,888)	$ (2,030)	$ (1,888)

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

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