Comprehensive Income/Loss (Comprised of the following Components) (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 Income (Loss) [Line Items]
Beginning Balance			$ 40,695	$ 18,169
Net change in other comprehensive income (loss)	$ 2,410	$ 2,117	(11,128)	33,676
Ending Balance	29,567	51,845	29,567	51,845
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			13,255	4,398
Net change in other comprehensive income (loss)			(3,981)	11,042
Ending Balance	9,274	15,440	9,274	15,440
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			33,276	16,479
Net change in other comprehensive income (loss)			(8,176)	23,181
Ending Balance	25,100	39,660	25,100	39,660
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(5,836)	(2,708)
Net change in other comprehensive income (loss)			1,029	(547)
Ending Balance	(4,807)	(3,255)	(4,807)	(3,255)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ 2,410	$ 2,117	$ (11,128)	$ 33,676