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Securities (Schedule Of Investments' Gross Unrealized Losses and Fair Value Aggregated by Security Type and Lengthof Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value |  | $ 1,997
Less than 12 Months, Unrealized Losses |  | (8)
12 Months or More, Fair Value | $ 1,998 |
12 Months or More, Unrealized Losses | (3) |
Total, Fair Value | 1,998 | 1,997
Total, Unrealized Losses | (3) | (8)
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 17,310 | 90,109
Less than 12 Months, Unrealized Losses | (228) | (3,362)
12 Months or More, Fair Value | 44,948 | 205
12 Months or More, Unrealized Losses | (829) | (6)
Total, Fair Value | 62,258 | 90,314
Total, Unrealized Losses | (1,057) | (3,368)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value |  | 6,895
Less than 12 Months, Unrealized Losses |  | (180)
12 Months or More, Fair Value | 6,859 |
12 Months or More, Unrealized Losses | (95) |
Total, Fair Value | 6,859 | 6,895
Total, Unrealized Losses | (95) | (180)
Mortgage-backed Securities-Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 22,250 | 152,614
Less than 12 Months, Unrealized Losses | (320) | (3,912)
12 Months or More, Fair Value | 125,846 | 9,967
12 Months or More, Unrealized Losses | (3,942) | (308)
Total, Fair Value | 148,096 | 162,581
Total, Unrealized Losses | (4,262) | (4,220)
Total Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 39,560 | 251,615
Less than 12 Months, Unrealized Losses | (548) | (7,462)
12 Months or More, Fair Value | 179,651 | 10,172
12 Months or More, Unrealized Losses | (4,869) | (314)
Total, Fair Value | 219,211 | 261,787
Total, Unrealized Losses | $ (5,417) | $ (7,776)

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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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