Stockholders' Equity (Accumulated Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive (Loss) Income [Roll Forward]
Unrealized Gain on Securities			$ 14,592
Realized gain on sale of securities, net of tax			(425)
Other comprehensive (loss) income, net of reclassifications and tax			(7,152)
Unrealized Gain on Securities	$ 7,865		7,865
Unrecognized Net Pension and Postretirement Costs			(3,872)
Other comprehensive (loss) income, net of reclassifications and tax			55
Unrecognized Net Pension and Postretirement Costs	(3,817)		(3,817)
Unrealized Loss on Cash Flow Hedge			(9,384)
Other comprehensive (loss) income, net of reclassifications and tax	(232)	$ (580)	3,114	$ (8,267)
Unrealized Loss on Cash Flow Hedge	(6,270)		(6,270)
Accumulated Other Comprehensive (Loss) Income			1,336
Accumulated Other Comprehensive (Loss) Income	$ (2,222)		(2,222)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			$ (3,983)