Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated other comprehensive income (loss), beginning balance	$ (141,153)
Net other comprehensive income (loss)	(7,760)	$ 16,040
Accumulated other comprehensive income (loss), ending balance	(148,913)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(116,591)	(131,033)
Other comprehensive income (loss) before reclassifications	(10,988)	13,198
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	(10,988)	13,198
Accumulated other comprehensive income (loss), ending balance	(127,579)	(117,835)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(15,619)	(22,645)
Other comprehensive income (loss) before reclassifications	1,979	795
Amounts reclassed from accumulated other comprehensive income (loss)	1,226	2,002
Net other comprehensive income (loss)	3,205	2,797
Accumulated other comprehensive income (loss), ending balance	(12,414)	(19,848)
Net Unrealized Losses on Defined Benefit Plan Obligations [Member]
Accumulated other comprehensive income (loss), beginning balance	(8,943)	(4,122)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	23	45
Net other comprehensive income (loss)	23	45
Accumulated other comprehensive income (loss), ending balance	(8,920)	(4,077)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(141,153)	(157,800)
Other comprehensive income (loss) before reclassifications	(9,009)	13,993
Amounts reclassed from accumulated other comprehensive income (loss)	1,249	2,047
Net other comprehensive income (loss)	(7,760)	16,040
Accumulated other comprehensive income (loss), ending balance	$ (148,913)	$ (141,760)