Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated other comprehensive income (loss), beginning balance			$ (141,153)
Net other comprehensive income (loss)	$ 2,587	$ (7,067)	(5,173)	$ 8,973
Accumulated other comprehensive income (loss), ending balance	(146,326)		(146,326)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(127,579)	(117,835)	(116,591)	(131,033)
Other comprehensive income (loss) before reclassifications	749	(9,827)	(10,239)	3,371
Amounts reclassed from accumulated other comprehensive income (loss)	0	0	0	0
Net other comprehensive income (loss)	749	(9,827)	(10,239)	3,371
Accumulated other comprehensive income (loss), ending balance	(126,830)	(127,662)	(126,830)	(127,662)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(12,414)	(19,848)	(15,619)	(22,645)
Other comprehensive income (loss) before reclassifications	589	1,289	2,568	2,084
Amounts reclassed from accumulated other comprehensive income (loss)	1,226	1,426	2,452	3,428
Net other comprehensive income (loss)	1,815	2,715	5,020	5,512
Accumulated other comprehensive income (loss), ending balance	(10,599)	(17,133)	(10,599)	(17,133)
Net Unrealized Losses on Defined Benefit Plan Obligations [Member]
Accumulated other comprehensive income (loss), beginning balance	(8,920)	(4,077)	(8,943)	(4,122)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	23	45	46	90
Net other comprehensive income (loss)	23	45	46	90
Accumulated other comprehensive income (loss), ending balance	(8,897)	(4,032)	(8,897)	(4,032)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(148,913)	(141,760)	(141,153)	(157,800)
Other comprehensive income (loss) before reclassifications	1,338	(8,538)	(7,671)	5,455
Amounts reclassed from accumulated other comprehensive income (loss)	1,249	1,471	2,498	3,518
Net other comprehensive income (loss)	2,587	(7,067)	(5,173)	8,973
Accumulated other comprehensive income (loss), ending balance	$ (146,326)	$ (148,827)	$ (146,326)	$ (148,827)