Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	167	78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 178,843	$ 30,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,407	155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	44,194	59,645
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(751)	(1,590)
Debt Securities, Available-for-sale, Unrealized Loss Position	223,037	89,816
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4,158	$ 1,745
US Government Corporations and Agencies Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	39	36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,979	$ 12,611
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	13	54
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	22,296	14,384
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(330)	(340)
Debt Securities, Available-for-sale, Unrealized Loss Position	27,275	26,995
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 343	$ 394
Government Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	17	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 15,256	$ 3,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	258	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	7,598	8,593
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(209)	(315)
Debt Securities, Available-for-sale, Unrealized Loss Position	22,854	11,720
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 467	$ 349
Nongovernment Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	7	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,505	$ 6,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	90	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,923	2,751
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(132)	(209)
Debt Securities, Available-for-sale, Unrealized Loss Position	12,428	9,521
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 222	$ 244
State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	44	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 66,087	$ 362
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,497	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	66,087	362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,497	$ 4
State and Policital Subdivisions Water and Sewer Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,548
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	5,548
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 64
State and Political Subdivisions Lease Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,460
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,460
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 33
State and Political Subdivisions Other Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 13,335
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	328
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	13,335
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 328
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	10	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 10,631	$ 3,952
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	220	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	986	1,904
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(13)	(96)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,617	5,856
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 233	$ 112
Asset-backed Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	9	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 8,680	$ 2,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	34	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,333	31,862
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(51)	(623)
Debt Securities, Available-for-sale, Unrealized Loss Position	18,013	33,872
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 85	$ 625
Tax Exempt State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	15	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 30,345	$ 924
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	617	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	902	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(15)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	31,247	924
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 632	$ 9
Tax Exempt State and Political Subdivisions Other Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	7	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,846	$ 415
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	120	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	156	151
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(7)
Debt Securities, Available-for-sale, Unrealized Loss Position	6,002	566
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 121	$ 8
State and Political Subdivisions Income Tax Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 720
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	720
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5
State and Political Subdivisions Sales Tax Revenues
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 6,451
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	128
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	6,451
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 128