Securities (Schedule Of Gross Unrealized Losses And Fair Value, Aggregated By Investment Category And Length Of Time) (Details) $ in Thousands	Mar. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Number of Securities | security	96	53
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Fair Value	$ 87,536	$ 56,489
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Unrealized Losses	$ (1,387)	$ (333)
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Number of Securities | security	14	14
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Fair Value	$ 37,697	$ 38,713
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Unrealized Losses	$ (2,303)	$ (1,511)
Total temporarily impaired debt securities, available-for-sale, Total, Number of Securities | security	110	67
Total temporarily impaired debt securities, available-for-sale, Total, Fair Value	$ 125,233	$ 95,202
Total temporarily impaired debt securities, available-for-sale, Total, Unrealized Losses	$ (3,690)	$ (1,844)
U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Number of Securities | security	0	0
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Fair Value	$ 0	$ 0
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Unrealized Losses	$ 0	$ 0
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Number of Securities | security	3	3
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Fair Value	$ 13,771	$ 14,071
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Unrealized Losses	$ (993)	$ (687)
Total temporarily impaired debt securities, available-for-sale, Total, Number of Securities | security	3	3
Total temporarily impaired debt securities, available-for-sale, Total, Fair Value	$ 13,771	$ 14,071
Total temporarily impaired debt securities, available-for-sale, Total, Unrealized Losses	$ (993)	$ (687)
U.S. Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Number of Securities | security	1	1
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Fair Value	$ 968	$ 989
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Unrealized Losses	$ (33)	$ (12)
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Number of Securities | security	4	4
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Fair Value	$ 15,998	$ 16,314
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Unrealized Losses	$ (1,011)	$ (700)
Total temporarily impaired debt securities, available-for-sale, Total, Number of Securities | security	5	5
Total temporarily impaired debt securities, available-for-sale, Total, Fair Value	$ 16,966	$ 17,303
Total temporarily impaired debt securities, available-for-sale, Total, Unrealized Losses	$ (1,044)	$ (712)
U.S. Agency Mortgage-Backed, Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Number of Securities | security	38	25
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Fair Value	$ 57,509	$ 43,329
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Unrealized Losses	$ (908)	$ (261)
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Number of Securities | security	2	2
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Fair Value	$ 4,765	$ 5,051
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Unrealized Losses	$ (157)	$ (95)
Total temporarily impaired debt securities, available-for-sale, Total, Number of Securities | security	40	27
Total temporarily impaired debt securities, available-for-sale, Total, Fair Value	$ 62,274	$ 48,380
Total temporarily impaired debt securities, available-for-sale, Total, Unrealized Losses	$ (1,065)	$ (356)
State And Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Number of Securities | security	57	27
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Fair Value	$ 29,059	$ 12,171
Total temporarily impaired debt securities, available-for-sale, Less than 12 months, Unrealized Losses	$ (446)	$ (60)
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Number of Securities | security	5	5
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Fair Value	$ 3,163	$ 3,277
Total temporarily impaired debt securities, available-for-sale, 12 months or more, Unrealized Losses	$ (142)	$ (29)
Total temporarily impaired debt securities, available-for-sale, Total, Number of Securities | security	62	32
Total temporarily impaired debt securities, available-for-sale, Total, Fair Value	$ 32,222	$ 15,448
Total temporarily impaired debt securities, available-for-sale, Total, Unrealized Losses	$ (588)	$ (89)