Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (1,337)	$ (2,452)
Net change in other comprehensive income (loss)	$ 680	$ 1,771	1,378	6,035
Ending Balance	41	3,583	41	3,583
Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			173	1,306
Net change in other comprehensive income (loss)			1,323	5,935
Ending Balance	1,496	7,241	1,496	7,241
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)			(29)	53
Ending Balance	332	(1,902)	332	(1,902)
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			281	427
Net change in other comprehensive income (loss)			(72)	(74)
Ending Balance	209	353	209	353
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(2,152)	(2,230)
Net change in other comprehensive income (loss)			156	121
Ending Balance	$ (1,996)	$ (2,109)	$ (1,996)	$ (2,109)