Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Document Period End Date	Mar. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	81	88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 49,047	$ 53,992
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,358	668
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	57,887	63,389
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,162)	(1,647)
Debt Securities, Available-for-sale, Unrealized Loss Position	106,934	117,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4,520	$ 2,315
U S Government Corporations And Agencies Securities [Member]
Debt Securities, Available-for-sale [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	$ 5,938	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,813	14,903
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(341)	(384)
Debt Securities, Available-for-sale, Unrealized Loss Position	19,751	14,903
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 342	$ 384
Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	9	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,780	$ 12,298
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	177	96
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,089	15,174
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(244)	(339)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,869	27,472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 421	$ 435
Nongovernment Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	7	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 8,267	$ 8,323
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	241	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,809	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(141)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	11,076	8,323
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 382	$ 41
State and Political Subdivisions General Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	4	10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,625	$ 10,581
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15	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	4,625	10,581
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15	$ 171
State and Policital Subdivisions Water and Sewer Revenues [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,861	$ 4,421
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	116	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	4,861	4,421
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 116	$ 114
State and Political Subdivisions Lease Revenues [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,800	$ 4,235
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	21	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	2,800	4,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 21	$ 77
State and Political Subdivisions University Revenues [Member]
Debt Securities, Available-for-sale [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]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,286	$ 6,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	70	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	5,286	6,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 70	$ 109
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	6	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,017	$ 1,686
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	180	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,871	3,739
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(129)	(146)
Debt Securities, Available-for-sale, Unrealized Loss Position	5,888	5,425
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 309	$ 149
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	20	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,756	$ 3,441
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	534	34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	30,305	29,573
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,307)	(778)
Debt Securities, Available-for-sale, Unrealized Loss Position	40,061	33,014
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,841	$ 812
Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member]
Debt Securities, Available-for-sale [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	$ 560
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2
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	560
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2
Tax Exempt State and Political Subdivisions Other Revenues [Member]
Debt Securities, Available-for-sale [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	$ 157	$ 1,183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	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	157	1,183
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 7