Stockholders' Equity (Accumulated Other Comprehensive (Loss) Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss)
Unrealized Gain (Loss) on Securities	$ (9,761)	$ 6,892		$ 7,439
Unrealized Gain (Loss) on Securities	12,303	(16,653)	(547)
Unrealized Gain (Loss) on Securities	2,542	(9,761)	6,892	7,439
Unrecognized Net Pension and Postretirement Costs	(3,483)	(6,238)		(6,027)
Unrecognized Net Pension and Postretirement Costs	(360)	2,755	(211)
Unrecognized Net Pension and Postretirement Costs	(3,843)	(3,483)	(6,238)	(6,027)
Accumulated Other Comprehensive Income (Loss)	(13,244)	654		1,412
Accumulated Other Comprehensive Income (Loss)	11,943	(13,898)	(758)
Accumulated Other Comprehensive Income (Loss)	(1,301)	(13,244)	654	1,412
Realized gain on sale of securities, net of tax	(259)	(318)
Other Comprehensive Income (Loss), Reclassification Adjustment in Net Income, Net of Tax		(318)
Realized loss due to settlement and curtailment, net of tax	910	175
Realized loss due to settlement and curtailment, net of tax	910	175
Other comprehensive income (loss), net of reclassifications and tax	12,562	(16,335)
Other comprehensive income (loss), net of reclassifications and tax	(1,270)	2,580
Other comprehensive income (loss), net of reclassifications and tax	$ 11,292	$ (13,755)