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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | $ 276,444 | $ 142,874
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,087 | 867
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 13,498 | 42,660
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,015 | 2,650
Securities available-for-sale, Total, Estimated Fair Value | 289,942 | 185,534
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 9,102 | 3,517
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 35,108 | 2,406
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,474 | 5
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 128
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 2
Securities available-for-sale, Total, Estimated Fair Value | 35,108 | 2,534
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1,474 | 7
U.S. Government agencies |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 225,530 | 129,612
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,099 | 688
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 8,527 | 34,044
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 461 | 1,333
Securities available-for-sale, Total, Estimated Fair Value | 234,057 | 163,656
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 6,560 | 2,021
Trust preferred securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 4,971 | 4,769
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 554 | 1,155
Securities available-for-sale, Total, Estimated Fair Value | 4,971 | 4,769
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 554 | 1,155
Corporate securities |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 14,306 | 10,856
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 478 | 174
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 2,231
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 147
Securities available-for-sale, Total, Estimated Fair Value | 14,306 | 13,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 478 | 321
Investment funds |  |
Schedule of Investments [Line Items] |  |
Securities available-for-sale, Less Than Twelve Months, Estimated Fair Value | 1,500 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 36 | 0
Securities available-for-sale, Twelve Months or Greater, Estimated Fair Value | 0 | 1,488
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 13
Securities available-for-sale, Total, Estimated Fair Value | 1,500 | 1,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 36 | $ 13

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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