Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (1,337)	$ (2,452)
Net change in other comprehensive income (loss)	$ 375	$ (83)	1,753	5,952
Ending Balance	416	3,500	416	3,500
Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			173	1,306
Net change in other comprehensive income (loss)			1,511	5,119
Ending Balance	1,684	6,425	1,684	6,425
Unrealized Gain (Loss) on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			361	(1,955)
Net change in other comprehensive income (loss)			116	763
Ending Balance	477	(1,192)	477	(1,192)
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			281	427
Net change in other comprehensive income (loss)			(108)	(110)
Ending Balance	173	317	173	317
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(2,152)	(2,230)
Net change in other comprehensive income (loss)			234	180
Ending Balance	$ (1,918)	$ (2,050)	$ (1,918)	$ (2,050)