Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 261,792	$ 276,444
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	6,921	8,087
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	14,720	13,498
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	810	1,015
Securities available-for-sale, Total, Estimated Fair Value	276,512	289,942
Securities available-for-sale, Total, Unrealized Loss	7,731	9,102
Obligations Of States And Political Subdivisions [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	41,257	35,108
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	1,223	1,474
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0	0
Securities available-for-sale, Total, Estimated Fair Value	41,257	35,108
Securities available-for-sale, Total, Unrealized Loss	1,223	1,474
U.S. Government Agencies Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	216,707	225,530
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	5,611	6,099
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	8,136	8,527
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	464	461
Securities available-for-sale, Total, Estimated Fair Value	224,843	234,057
Securities available-for-sale, Total, Unrealized Loss	6,075	6,560
Corporate Securities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	2,328	14,306
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	51	478
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	2,265	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	145	0
Securities available-for-sale, Total, Estimated Fair Value	4,593	14,306
Securities available-for-sale, Total, Unrealized Loss	196	478
Money Market Funds [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	1,500	1,500
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	36	36
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	0	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	0	0
Securities available-for-sale, Total, Estimated Fair Value	1,500	1,500
Securities available-for-sale, Total, Unrealized Loss	36	36
Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	0	0
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	0	0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	4,319	4,971
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	201	554
Securities available-for-sale, Total, Estimated Fair Value	4,319	4,971
Securities available-for-sale, Total, Unrealized Loss	$ 201	$ 554