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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | $ 50,216 | $ 39,560
Less than 12 Months, Unrealized Losses | (1,401) | (548)
12 Months or More, Fair Value | 181,881 | 179,651
12 Months or More, Unrealized Losses | (10,154) | (4,869)
Total, Fair Value | 232,097 | 219,211
Total, Unrealized Losses | (11,555) | (5,417)
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value |  | 0
Less than 12 Months, Unrealized Losses |  | 0
12 Months or More, Fair Value |  | 1,998
12 Months or More, Unrealized Losses |  | (3)
Total, Fair Value |  | 1,998
Total, Unrealized Losses |  | (3)
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 30,755 | 17,310
Less than 12 Months, Unrealized Losses | (1,075) | (228)
12 Months or More, Fair Value | 51,547 | 44,948
12 Months or More, Unrealized Losses | (2,386) | (829)
Total, Fair Value | 82,302 | 62,258
Total, Unrealized Losses | (3,461) | (1,057)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 2,054 | 0
Less than 12 Months, Unrealized Losses | (23) | 0
12 Months or More, Fair Value | 6,630 | 6,859
12 Months or More, Unrealized Losses | (231) | (95)
Total, Fair Value | 8,684 | 6,859
Total, Unrealized Losses | (254) | (95)
Mortgage-backed Securities-Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 17,407 | 22,250
Less than 12 Months, Unrealized Losses | (303) | (320)
12 Months or More, Fair Value | 123,704 | 125,846
12 Months or More, Unrealized Losses | (7,537) | (3,942)
Total, Fair Value | 141,111 | 148,096
Total, Unrealized Losses | $ (7,840) | $ (4,262)

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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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