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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, 2021 | Dec. 31, 2020
--- | --- | ---
Less than 12 months, Fair Value | $ 515,182 | $ 84,529
Less than 12 months, Unrealized Losses | 10,599 | 891
More than 12 months, Fair Value | 102,211 | 9,994
More than 12 months, Unrealized Losses | 4,196 | 6
Total, Fair Value | 617,393 | 94,523
Total, Unrealized Losses | 14,795 | 897
US Treasury and Government [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
US Treasury Securities [Member] |  |
Less than 12 months, Fair Value | 89,958 | 0
Less than 12 months, Unrealized Losses | 1,311 | 0
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Fair Value | 89,958 | 0
Total, Unrealized Losses | 1,311 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, Fair Value | 130,001 | 8,950
Less than 12 months, Unrealized Losses | 3,253 | 24
More than 12 months, Fair Value | 15,237 | 0
More than 12 months, Unrealized Losses | 856 | 0
Total, Fair Value | 145,238 | 8,950
Total, Unrealized Losses | 4,109 | 24
Collateralized Mortgage Backed Securities [Member] |  |
Less than 12 months, Fair Value | 261,560 | 75,126
Less than 12 months, Unrealized Losses | 5,709 | 866
More than 12 months, Fair Value | 86,974 | 9,994
More than 12 months, Unrealized Losses | 3,340 | 6
Total, Fair Value | 348,534 | 85,120
Total, Unrealized Losses | 9,049 | 872
Corporate Debt Securities [Member] |  |
Less than 12 months, Fair Value | 17,369 | 453
Less than 12 months, Unrealized Losses | 233 | 1
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Fair Value | 17,369 | 453
Total, Unrealized Losses | 233 | 1
Asset-backed Securities [Member] |  |
Less than 12 months, Fair Value | 16,294 | 0
Less than 12 months, Unrealized Losses | 93 | 0
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Fair Value | 16,294 | 0
Total, Unrealized Losses | $ 93 | $ 0

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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=124269663&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=123581744&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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