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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | $ 187,052 | $ 276,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,054 | 8,087
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 162,016 | 13,498
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,871 | 1,015
Securities available-for-sale, Total, Estimated Fair Value | 349,068 | 289,942
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7,925 | 9,102
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 4,913 | 35,108
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 28 | 1,474
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 19,440 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 379 | 0
Securities available-for-sale, Total, Estimated Fair Value | 24,353 | 35,108
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 407 | 1,474
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 172,807 | 225,530
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,887 | 6,099
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 140,226 | 8,527
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5,418 | 461
Securities available-for-sale, Total, Estimated Fair Value | 313,033 | 234,057
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7,305 | 6,560
Trust preferred securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 4,475 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 54 | 0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 4,971
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 554
Securities available-for-sale, Total, Estimated Fair Value | 4,475 | 4,971
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 54 | 554
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 3,357 | 14,306
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 49 | 478
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 2,350 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 74 | 0
Securities available-for-sale, Total, Estimated Fair Value | 5,707 | 14,306
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 123 | 478
Investment funds |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 1,500 | 1,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 36 | 36
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Securities available-for-sale, Total, Estimated Fair Value | 1,500 | 1,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 36 | $ 36

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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