Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Sep. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	61	134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 47,966	$ 75,442
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	637	791
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	42,338	84,860
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(959)	(2,220)
Debt Securities, Available-for-sale, Unrealized Loss Position	90,304	160,302
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,596	$ 3,011
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	15	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 12,185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	184
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,730	7,464
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(367)	(182)
Debt Securities, Available-for-sale, Unrealized Loss Position	15,730	19,649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 367	$ 366
Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	21	37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 19,162	$ 23,277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	324	241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,750	24,472
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(153)	(936)
Debt Securities, Available-for-sale, Unrealized Loss Position	27,912	47,749
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 477	$ 1,177
Nongovernment Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	3	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 5,998	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	38	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	436
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Unrealized Loss Position	5,998	436
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38	$ 1
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		8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		5,222
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(126)
Debt Securities, Available-for-sale, Unrealized Loss Position		5,222
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 126
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		11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 968
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		9,450
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(170)
Debt Securities, Available-for-sale, Unrealized Loss Position		10,418
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 186
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,358	$ 2,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	23	109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,859	4,587
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(141)	(195)
Debt Securities, Available-for-sale, Unrealized Loss Position	5,217	7,346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 164	$ 304
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	15	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 17,420	$ 20,129
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	240	123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,999	0
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(298)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	33,419	20,129
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 538	$ 123
Tax Exempt 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		25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 7,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		16,830
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(294)
Debt Securities, Available-for-sale, Unrealized Loss Position		24,103
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 344
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		7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 989
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		4,311
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(92)
Debt Securities, Available-for-sale, Unrealized Loss Position		5,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 98
Tax Exempt 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
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 553
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		557
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(7)
Debt Securities, Available-for-sale, Unrealized Loss Position		1,110
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 7
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	12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,031	$ 7,309
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	11,531
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(217)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,031	18,840
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3	$ 279
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	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 997
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9
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	997
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9