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Note 2 - Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Less than 12 months, Fair Value | $ 84,529 | $ 191,926
Less than 12 months, Unrealized Losses | 891 | 1,622
More than 12 months, Fair Value | 9,994 | 925
More than 12 months, Unrealized Losses | 6 | 4
Total, Fair Value | 94,523 | 192,851
Total, Unrealized Losses | 897 | 1,626
Less than 12 months, Unrealized Losses | (891) | (1,622)
More than 12 months, Unrealized Losses | (6) | (4)
Total, Unrealized Losses | (897) | (1,626)
US Treasury and Government [Member] |  |
Less than 12 months, Fair Value | 0 | 7,175
Less than 12 months, Unrealized Losses | 0 | 39
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | (0)
Total, Fair Value | 0 | 7,175
Total, Unrealized Losses | 0 | 39
Less than 12 months, Unrealized Losses | 0 | (39)
More than 12 months, Unrealized Losses | 0 | 0
Total, Unrealized Losses | 0 | (39)
US Treasury Securities [Member] |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 months, Unrealized Losses | 0 | (0)
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | (0)
Total, Fair Value | 0 | 0
Total, Unrealized Losses | 0 | (0)
Less than 12 months, Unrealized Losses | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Unrealized Losses | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, Fair Value | 8,950 | 75,099
Less than 12 months, Unrealized Losses | 24 | 1,256
More than 12 months, Fair Value | 0 | 252
More than 12 months, Unrealized Losses | 0 | 1
Total, Fair Value | 8,950 | 75,351
Total, Unrealized Losses | 24 | 1,257
Less than 12 months, Unrealized Losses | (24) | (1,256)
More than 12 months, Unrealized Losses | 0 | (1)
Total, Unrealized Losses | (24) | (1,257)
Collateralized Mortgage Backed Securities [Member] |  |
Less than 12 months, Fair Value | 75,126 | 109,652
Less than 12 months, Unrealized Losses | 866 | 327
More than 12 months, Fair Value | 9,994 | 373
More than 12 months, Unrealized Losses | 6 | 2
Total, Fair Value | 85,120 | 110,025
Total, Unrealized Losses | 872 | 329
Less than 12 months, Unrealized Losses | (866) | (327)
More than 12 months, Unrealized Losses | (6) | (2)
Total, Unrealized Losses | (872) | (329)
Corporate Debt Securities [Member] |  |
Less than 12 months, Fair Value | 453 | 0
Less than 12 months, Unrealized Losses | 1 | (0)
More than 12 months, Fair Value | 0 | 300
More than 12 months, Unrealized Losses | 0 | 1
Total, Fair Value | 453 | 300
Total, Unrealized Losses | 1 | 1
Less than 12 months, Unrealized Losses | (1) | 0
More than 12 months, Unrealized Losses | 0 | (1)
Total, Unrealized Losses | $ (1) | $ (1)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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