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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 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | $ 66,650 | $ 39,560
Less than 12 Months, Unrealized Losses | (1,501) | (548)
12 Months or More, Fair Value | 169,690 | 179,651
12 Months or More, Unrealized Losses | (7,629) | (4,869)
Total, Fair Value | 236,340 | 219,211
Total, Unrealized Losses | (9,130) | (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 | 37,210 | 17,310
Less than 12 Months, Unrealized Losses | (849) | (228)
12 Months or More, Fair Value | 43,704 | 44,948
12 Months or More, Unrealized Losses | (1,738) | (829)
Total, Fair Value | 80,914 | 62,258
Total, Unrealized Losses | (2,587) | (1,057)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 2,076 | 0
Less than 12 Months, Unrealized Losses | (21) | 0
12 Months or More, Fair Value | 6,691 | 6,859
12 Months or More, Unrealized Losses | (232) | (95)
Total, Fair Value | 8,767 | 6,859
Total, Unrealized Losses | (253) | (95)
Mortgage-backed Securities-Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 Months, Fair Value | 27,364 | 22,250
Less than 12 Months, Unrealized Losses | (631) | (320)
12 Months or More, Fair Value | 119,295 | 125,846
12 Months or More, Unrealized Losses | (5,659) | (3,942)
Total, Fair Value | 146,659 | 148,096
Total, Unrealized Losses | $ (6,290) | $ (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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