Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 2,183	$ 40,695
Net change in other comprehensive income (loss)	$ (31,262)	$ 2,410	(111,647)	(11,128)
Ending Balance	(109,464)	29,567	(109,464)	29,567
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(9,667)	13,255
Net change in other comprehensive income (loss)			(86,290)	(3,981)
Ending Balance	(95,957)	9,274	(95,957)	9,274
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			14,137	33,276
Net change in other comprehensive income (loss)			(25,599)	(8,176)
Ending Balance	(11,462)	25,100	(11,462)	25,100
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(2,287)	(5,836)
Net change in other comprehensive income (loss)			242	1,029
Ending Balance	(2,045)	(4,807)	(2,045)	(4,807)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ (31,262)	$ 2,410	$ (111,647)	$ (11,128)