Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) $ in Thousands	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	157	78
Less than 12 months, Estimated Fair Value	$ 169,460	$ 30,171
Less than 12 months, Unrealized Loss	(2,926)	(155)
12 months or more, Estimated Fair Value	39,837	59,645
12 months or more, Unrealized Loss	(837)	(1,590)
Debt Securities, Available-for-sale, Unrealized Loss Position	209,297	89,816
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3,763	$ 1,745
U.S. Government and agencies and corporations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	41	36
Less than 12 months, Estimated Fair Value	$ 6,630	$ 12,611
Less than 12 months, Unrealized Loss	(23)	(54)
12 months or more, Estimated Fair Value	21,061	14,384
12 months or more, Unrealized Loss	(337)	(340)
Debt Securities, Available-for-sale, Unrealized Loss Position	27,691	26,995
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 360	$ 394
Government-sponsored agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	19	10
Less than 12 months, Estimated Fair Value	$ 19,828	$ 3,127
Less than 12 months, Unrealized Loss	(376)	(34)
12 months or more, Estimated Fair Value	6,886	8,593
12 months or more, Unrealized Loss	(212)	(315)
Debt Securities, Available-for-sale, Unrealized Loss Position	26,714	11,720
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 588	$ 349
Nongovernment-sponsored entities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	6	6
Less than 12 months, Estimated Fair Value	$ 4,345	$ 6,770
Less than 12 months, Unrealized Loss	(61)	(35)
12 months or more, Estimated Fair Value	7,591	2,751
12 months or more, Unrealized Loss	(218)	(209)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,936	9,521
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 279	$ 244
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	41	1
Less than 12 months, Estimated Fair Value	$ 62,543	$ 362
Less than 12 months, Unrealized Loss	(1,286)	(4)
12 months or more, Estimated Fair Value	1,055	0
12 months or more, Unrealized Loss	(37)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	63,598	362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,323	$ 4
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
Less than 12 months, Estimated Fair Value	$ 1,564
Less than 12 months, Unrealized Loss	(14)
12 months or more, Estimated Fair Value	494
12 months or more, Unrealized Loss	(12)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,058
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 26
State and Political Subdivisions Income Tax Revenues [Domain]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	1
Less than 12 months, Estimated Fair Value	$ 721
Less than 12 months, Unrealized Loss	(3)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	721
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3
State and Political Subdivisions Sales Tax Revenues
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	2
Less than 12 months, Estimated Fair Value	$ 6,052
Less than 12 months, Unrealized Loss	(99)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	6,052
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 99
State and Political Subdivisions Various Tax Revenues
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5
Less than 12 months, Estimated Fair Value	$ 8,389
Less than 12 months, Unrealized Loss	(203)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	8,389
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 203
State and Political Subdivisions Utility Revenues
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	3
Less than 12 months, Estimated Fair Value	$ 5,175
Less than 12 months, Unrealized Loss	(130)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	5,175
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 130
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
Less than 12 months, Estimated Fair Value	$ 744
Less than 12 months, Unrealized Loss	(9)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	744
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9
Corporate debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	10	6
Less than 12 months, Estimated Fair Value	$ 10,534	$ 3,952
Less than 12 months, Unrealized Loss	(314)	(16)
12 months or more, Estimated Fair Value	990	1,904
12 months or more, Unrealized Loss	(10)	(96)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,524	5,856
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 324	$ 112
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	8	16
Less than 12 months, Estimated Fair Value	$ 10,522	$ 2,010
Less than 12 months, Unrealized Loss	(86)	(2)
12 months or more, Estimated Fair Value	751	31,862
12 months or more, Unrealized Loss	(1)	(623)
Debt Securities, Available-for-sale, Unrealized Loss Position	11,273	33,872
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 87	$ 625
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	13	1
Less than 12 months, Estimated Fair Value	$ 25,555	$ 924
Less than 12 months, Unrealized Loss	(261)	(9)
12 months or more, Estimated Fair Value	853	0
12 months or more, Unrealized Loss	(9)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	26,408	924
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 270	$ 9
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
Less than 12 months, Estimated Fair Value	$ 904
Less than 12 months, Unrealized Loss	(15)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	904
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15
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	1
Less than 12 months, Estimated Fair Value	$ 2,396
Less than 12 months, Unrealized Loss	(31)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	2,396
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 31
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	3	2
Less than 12 months, Estimated Fair Value	$ 3,558	$ 415
Less than 12 months, Unrealized Loss	(15)	(1)
12 months or more, Estimated Fair Value	156	151
12 months or more, Unrealized Loss	(1)	(7)
Debt Securities, Available-for-sale, Unrealized Loss Position	3,714	566
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 16	$ 8