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Investments (Gross Unrealized Losses And Fair Value Of Investments) (Details) - USD ($) $ in Thousands | Mar. 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 | $ 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

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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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