Stockholders' Equity (Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Unrealized Gain (Loss) on Securities			$ (10,082)
Realized gain on sale of securities, net of tax			(55)
Other comprehensive income (loss), net of reclassifications and tax			19,422
Unrealized Gain (Loss) on Securities	$ 9,285		9,285
Unrecognized Net Pension and Postretirement Costs			(3,711)
Other comprehensive income (loss), net of reclassifications and tax			46
Unrecognized Net Pension and Postretirement Costs	(3,665)		(3,665)
Unrealized (Loss) Gain on Cash Flow Hedge			860
Other comprehensive income (loss), net of reclassifications and tax	(1,467)	$ 514	(5,391)	$ 2,027
Unrealized (Loss) Gain on Cash Flow Hedge	(4,531)		(4,531)
Accumulated Other Comprehensive Income (Loss)			(12,933)
Realized gain on sale of securities, net of tax			(55)
Other comprehensive income (loss), net of reclassifications and tax			14,077
Accumulated Other Comprehensive Income (Loss)	$ 1,089		$ 1,089