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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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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

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