Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	$ 170,103	$ 276,444
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	3,386	8,087
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	71,938	13,498
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	2,504	1,015
Securities available-for-sale, Total, Estimated Fair Value	242,041	289,942
Securities available-for-sale, Total, Unrealized Loss	5,890	9,102
Obligations Of States And Political Subdivisions
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	8,291	35,108
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	146	1,474
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	11,859	0
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	428	0
Securities available-for-sale, Total, Estimated Fair Value	20,150	35,108
Securities available-for-sale, Total, Unrealized Loss	574	1,474
U.S. Government Agencies Mortgage-backed Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	160,312	225,530
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	3,214	6,099
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value	57,814	8,527
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss	1,922	461
Securities available-for-sale, Total, Estimated Fair Value	218,126	234,057
Securities available-for-sale, Total, Unrealized Loss	5,136	6,560
Corporate Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value	0	14,306
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss	0	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	154	0
Securities available-for-sale, Total, Estimated Fair Value	2,265	14,306
Securities available-for-sale, Total, Unrealized Loss	154	478
Money Market Funds
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	26	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	$ 26	36
Trust Preferred Securities
Schedule of Investments [Line Items]
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value		0
Securities available-for-sale, Less Than Twelve Months, Unrealized Loss		0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value		4,971
Securities available-for-sale, Twelve Months or Greater, Unrealized Loss		554
Securities available-for-sale, Total, Estimated Fair Value		4,971
Securities available-for-sale, Total, Unrealized Loss		$ 554