Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (163,084)	$ 2,183
Net change in other comprehensive income (loss)	$ (7,811)	$ (69,605)	2,338	(181,252)
Ending Balance	(160,746)	(179,069)	(160,746)	(179,069)
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)			(2,304)	(128,872)
Ending Balance	(130,961)	(138,539)	(130,961)	(138,539)
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)			4,917	(52,743)
Ending Balance	(31,713)	(38,606)	(31,713)	(38,606)
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			2,203	(2,287)
Net change in other comprehensive income (loss)			(275)	363
Ending Balance	1,928	(1,924)	1,928	(1,924)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ (7,811)	$ (69,605)	$ 2,338	$ (181,252)