Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Mar. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	112	78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 63,353	$ 30,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,237	155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	62,933	59,645
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,035)	(1,590)
Debt Securities, Available-for-sale, Unrealized Loss Position	126,286	89,816
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,272	$ 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	41	36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,053	$ 12,611
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21	54
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	25,552	14,384
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(367)	(340)
Debt Securities, Available-for-sale, Unrealized Loss Position	34,605	26,995
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 388	$ 394
Government Sponsored Agencies [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	13	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,228	$ 3,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	130	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,258	8,593
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(234)	(315)
Debt Securities, Available-for-sale, Unrealized Loss Position	17,486	11,720
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 364	$ 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	$ 8,116	$ 6,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	116	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	4,093	2,751
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(191)	(209)
Debt Securities, Available-for-sale, Unrealized Loss Position	12,209	9,521
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 307	$ 244
State and Political Subdivisions General Obligations [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	14	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 10,804	$ 362
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	505	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	10,804	362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 505	$ 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	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 6,096
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	91
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	6,096
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 91
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	$ 1,422
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	73
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	1,422
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 73
State and Political Subdivisions Jail Authority 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	$ 2,628
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	25
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	2,628
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25
State and Political Subdivisions Various Tax Revenues
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,158
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	184
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	3,158
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 184
Corporate Debt Securities [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	$ 5,516	$ 3,952
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	17	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,982	1,904
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(18)	(96)
Debt Securities, Available-for-sale, Unrealized Loss Position	7,498	5,856
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 35	$ 112
Asset-backed Securities [Member]
Marketable Securities [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	12	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,396	$ 2,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	45	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	22,896	31,862
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(220)	(623)
Debt Securities, Available-for-sale, Unrealized Loss Position	28,292	33,872
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 265	$ 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	2	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,936	$ 924
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30	9
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	1,936	924
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 30	$ 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	1	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 415
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	152	151
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(5)	(7)
Debt Securities, Available-for-sale, Unrealized Loss Position	152	566
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5	$ 8