Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (163,084)	$ 2,183
Net change in other comprehensive income (loss)	$ (16,990)	$ (31,262)	10,149	(111,647)
Ending Balance	(152,935)	(109,464)	(152,935)	(109,464)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(128,657)	(9,667)
Net change in other comprehensive income (loss)			5,617	(86,290)
Ending Balance	(123,040)	(95,957)	(123,040)	(95,957)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(36,630)	14,137
Net change in other comprehensive income (loss)			4,715	(25,599)
Ending Balance	(31,915)	(11,462)	(31,915)	(11,462)
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			2,203	(2,287)
Net change in other comprehensive income (loss)			(183)	242
Ending Balance	2,020	(2,045)	2,020	(2,045)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ (16,990)	$ (31,262)	$ 10,149	$ (111,647)