Stockholders' Equity (Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss)
Unrealized Gain (Loss) on Securities	$ 2,542	$ (9,761)	$ 6,892
Unrealized Gain (Loss) on Securities	327	12,303	(16,653)
Unrealized Gain (Loss) on Securities	2,869	2,542	(9,761)
Unrecognized Net Pension and Postretirement Costs	(3,843)	(3,483)	(6,238)
Unrecognized Net Pension and Postretirement Costs	615	(360)	2,755
Unrecognized Net Pension and Postretirement Costs	(3,228)	(3,843)	(3,483)
Accumulated Other Comprehensive Income (Loss)	(1,301)	(13,244)	654
Accumulated Other Comprehensive Income (Loss)	942	11,943	(13,898)
Accumulated Other Comprehensive Income (Loss)	(359)	(1,301)	(13,244)
Realized gain on sale of securities, net of tax	(474)	(259)	(318)
Other Comprehensive Income (Loss), Reclassification Adjustment in Net Income, Net of Tax		(259)	(318)
Realized loss due to settlement and curtailment, net of tax	298	910	175
Realized loss due to settlement and curtailment, net of tax	298	910	175
Other comprehensive income, net of reclassifications and tax	801	12,562	(16,335)
Other comprehensive income, net of reclassifications and tax	317	(1,270)	2,580
Other comprehensive income, net of reclassifications and tax	$ 1,118	$ 11,292	$ (13,755)