Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (163,084)	$ 2,183
Net change in other comprehensive income (loss)	27,139	(80,385)
Ending Balance	(135,945)	(78,202)
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)	17,068	(62,556)
Ending Balance	(111,589)	(72,223)
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)	10,163	(17,950)
Ending Balance	(26,467)	(3,813)
Defined Benefit Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,203	(2,287)
Net change in other comprehensive income (loss)	(92)	121
Ending Balance	2,111	(2,166)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net change in other comprehensive income (loss)	$ 27,139	$ (80,385)