Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Mar. 31, 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	93	134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 61,600	$ 75,442
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	802	791
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	61,993	84,860
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,290	2,220
Debt Securities, Available-for-sale, Unrealized Loss Position	123,593	160,302
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,092	$ 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	$ 1,925	$ 12,185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	30	184
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	16,576	7,464
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	322	182
Debt Securities, Available-for-sale, Unrealized Loss Position	18,501	19,649
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 352	$ 366
Government Sponsored Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	32	37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 17,412	$ 23,277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	230	241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	26,153	24,472
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	647	936
Debt Securities, Available-for-sale, Unrealized Loss Position	43,565	47,749
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 877	$ 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	$ 5,804	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	92	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	327	436
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1	1
Debt Securities, Available-for-sale, Unrealized Loss Position	6,131	436
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 93	$ 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	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,319	5,222
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	27	126
Debt Securities, Available-for-sale, Unrealized Loss Position	5,319	5,222
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 27	$ 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	8	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 968
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	5,879	9,450
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	30	170
Debt Securities, Available-for-sale, Unrealized Loss Position	5,879	10,418
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 30	$ 186
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	7	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,692	$ 2,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	90	109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,540	4,587
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	210	195
Debt Securities, Available-for-sale, Unrealized Loss Position	6,232	7,346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 300	$ 304
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	14	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 32,767	$ 20,129
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	360	123
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	32,767	20,129
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 360	$ 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	4	25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 7,273
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	3,023	16,830
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	23	294
Debt Securities, Available-for-sale, Unrealized Loss Position	3,023	24,103
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 23	$ 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	1	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 989
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,163	4,311
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	92
Debt Securities, Available-for-sale, Unrealized Loss Position	1,163	5,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5	$ 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	$ 0	$ 7,309
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,013	11,531
Debt Securities Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25	217
Debt Securities, Available-for-sale, Unrealized Loss Position	1,013	18,840
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25	$ 279