Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Marketable Securities [Line Items]
Document Period End Date	Jun. 30, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	87	88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 51,539	$ 53,992
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,249	668
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	59,004	63,389
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,149)	(1,647)
Debt Securities, Available-for-sale, Unrealized Loss Position	110,543	117,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4,398	$ 2,315
Debt Securities, Held to Maturity, Unrealized Loss Position, Number of Positions | security	7
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 10,213
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	38
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	10,213
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ 38
US Government Corporations and Agencies Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	34	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 16,401	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	65	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,092	14,903
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(385)	(384)
Debt Securities, Available-for-sale, Unrealized Loss Position	29,493	14,903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 450	$ 384
Government Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	10	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,626	$ 12,298
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	26	96
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,218	15,174
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(378)	(339)
Debt Securities, Available-for-sale, Unrealized Loss Position	12,844	27,472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 404	$ 435
Nongovernment Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	6	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,203	$ 8,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	59	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,462	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(285)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	8,665	8,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 344	$ 41
State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 501	$ 10,581
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5	171
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	501	10,581
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5	$ 171
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	1	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,113	$ 4,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	114
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	1,113	4,421
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2	$ 114
State and Political Subdivisions Lease Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 4,235
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		77
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		4,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 77
State and Political Subdivisions University 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		$ 1,307
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		16
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		1,307
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 16
State and Political Subdivisions Other Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,095	$ 6,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	34	109
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	1,095	6,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 34	$ 109
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	11	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 8,941	$ 1,686
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	569	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,884	3,739
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(116)	(146)
Debt Securities, Available-for-sale, Unrealized Loss Position	10,825	5,425
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 685	$ 149
Asset-backed Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	21	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 14,956	$ 3,441
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	474	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	30,348	29,573
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,985)	(778)
Debt Securities, Available-for-sale, Unrealized Loss Position	45,304	33,014
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,459	$ 812
Tax Exempt State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Held to Maturity, Unrealized Loss Position, Number of Positions | security	4
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 6,662
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	34
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	6,662
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ 34
Tax Exempt State and Political Subdivisions Water and Sewer 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	$ 558
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1
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	558
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1
Tax Exempt State and Political Subdivisions Sales Tax Revenues [Member]
Marketable Securities [Line Items]
Debt Securities, Held to Maturity, Unrealized Loss Position, Number of Positions | security	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 2,921
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	2,921
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ 2
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	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 145	$ 1,183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14	7
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	145	1,183
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 14	$ 7
Debt Securities, Held to Maturity, Unrealized Loss Position, Number of Positions | security	1
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 630
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	630
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ 2