Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (2,452)	$ (2,132)
Net change in other comprehensive income (loss)	4,264	1,719
Ending Balance	1,812	(413)
Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,306	3,389
Net change in other comprehensive income (loss)	4,081	1,561
Ending Balance	5,387	4,950
Unrealized Loss on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,955)	(3,298)
Net change in other comprehensive income (loss)	161	119
Ending Balance	(1,794)	(3,179)
Deferred Gain on Hedge Transactions
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	427	571
Net change in other comprehensive income (loss)	(38)	(37)
Ending Balance	389	534
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,230)	(2,794)
Net change in other comprehensive income (loss)	60	76
Ending Balance	$ (2,170)	$ (2,718)