Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	85	88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 49,435	$ 53,992
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	779	668
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	58,296	63,389
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,117)	(1,647)
Debt Securities, Available-for-sale, Unrealized Loss Position	107,731	117,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,896	$ 2,315
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	$ 15,995	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	12,427	14,903
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(357)	(384)
Debt Securities, Available-for-sale, Unrealized Loss Position	28,422	14,903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 418	$ 384
Government Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	12	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 6,031	$ 12,298
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	49	96
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,327	15,174
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(350)	(339)
Debt Securities, Available-for-sale, Unrealized Loss Position	15,358	27,472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 399	$ 435
Nongovernment Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	4	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,492	$ 8,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	22	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,726	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(230)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	6,218	8,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 252	$ 41
State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security		10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 10,581
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		171
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		10,581
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 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		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 4,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		114
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		4,421
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 114
State and Political Subdivisions Lease 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	$ 1,515	$ 4,235
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	77
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	1,515	4,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3	$ 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	$ 1,513	$ 6,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	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	1,513	6,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 109
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	$ 8,381	$ 1,686
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	410	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,886	3,739
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(114)	(146)
Debt Securities, Available-for-sale, Unrealized Loss Position	10,267	5,425
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 524	$ 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	$ 11,391	$ 3,441
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	204	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	31,930	29,573
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,066)	(778)
Debt Securities, Available-for-sale, Unrealized Loss Position	43,321	33,014
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,270	$ 812
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	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 972
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17
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	972
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 17
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	12	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	$ 12	$ 7