Accumulated Other Comprehensive Income (Changes in AOCI by Component) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	$ 2,789	$ 3,560	$ 5,621	$ (12,044)
Other comprehensive loss before reclassifications	[1]	10,126	(4,057)	7,881	11,830
Amounts reclassified from accumulated other comprehensive income (loss) (2)	[1],[2]	(89)	2	(676)	(281)
Net current-period other comprehensive income (loss)	[1]	10,037	(4,055)	7,205	11,549
Ending balance	[1]	12,826	(495)	12,826	(495)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	4,819	5,448	7,462	(10,108)
Other comprehensive loss before reclassifications	[1]	10,126	(4,057)	8,161	11,830
Amounts reclassified from accumulated other comprehensive income (loss) (2)	[1],[2]	(151)	(21)	(829)	(352)
Net current-period other comprehensive income (loss)	[1]	9,975	(4,078)	7,332	11,478
Ending balance	[1]	14,794	1,370	14,794	1,370
Unrealized Gains and Losses on Pension Plan Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(2,030)	(1,888)	(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]	62	23	153	71
Net current-period other comprehensive income (loss)	[1]	62	23	(127)	71
Ending balance	[1]	$ (1,968)	$ (1,865)	$ (1,968)	$ (1,865)

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

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