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Note C - Securities - Securities Available-for-sale With Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Less than 12 Months - Fair Value | $ 44,331 | $ 74,587
Less than 12 Months - Unrealized Loss | (531) | (1,996)
12 Months or More - Fair Value | 38,326 |
12 Months or More - Unrealized Loss | (1,099) |
Fair Value | 82,657 | 74,587
Unrealized Loss | (1,630) | (1,996)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Less than 12 Months - Fair Value | 6,910 | 10,544
Less than 12 Months - Unrealized Loss | (97) | (80)
12 Months or More - Fair Value | 6,563 |
12 Months or More - Unrealized Loss | (52) |
Fair Value | 13,473 | 10,544
Unrealized Loss | (149) | (80)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Less than 12 Months - Fair Value | 37,421 | 64,043
Less than 12 Months - Unrealized Loss | (434) | (1,916)
12 Months or More - Fair Value | 31,763 |
12 Months or More - Unrealized Loss | (1,047) |
Fair Value | 69,184 | 64,043
Unrealized Loss | $ (1,481) | $ (1,916)

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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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
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