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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 months, Fair Value | $ 269,072 | $ 515,182
Less than 12 months, Unrealized Losses | 49,027 | 10,599
More than 12 months, Fair Value | 257,220 | 102,211
More than 12 months, Unrealized Losses | 49,609 | 4,196
Total, Fair Value | 526,292 | 617,393
Total, Unrealized Losses | 98,636 | 14,795
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 | 0 | 89,958
Less than 12 months, Unrealized Losses | 0 | 1,311
More than 12 months, Fair Value | 77,554 | 0
More than 12 months, Unrealized Losses | 13,372 | 0
Total, Fair Value | 77,554 | 89,958
Total, Unrealized Losses | 13,372 | 1,311
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, Fair Value | 181,857 | 130,001
Less than 12 months, Unrealized Losses | 44,576 | 3,253
More than 12 months, Fair Value | 40,756 | 15,237
More than 12 months, Unrealized Losses | 12,735 | 856
Total, Fair Value | 222,613 | 145,238
Total, Unrealized Losses | 57,311 | 4,109
Collateralized Mortgage-Backed Securities [Member] |  |
Less than 12 months, Fair Value | 86,499 | 261,560
Less than 12 months, Unrealized Losses | 4,410 | 5,709
More than 12 months, Fair Value | 125,765 | 86,974
More than 12 months, Unrealized Losses | 22,994 | 3,340
Total, Fair Value | 212,264 | 348,534
Total, Unrealized Losses | 27,404 | 9,049
Corporate Debt Securities [Member] |  |
Less than 12 months, Fair Value | 716 | 17,369
Less than 12 months, Unrealized Losses | 41 | 233
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Fair Value | 716 | 17,369
Total, Unrealized Losses | 41 | 233
Asset-Backed Securities [Member] |  |
Less than 12 months, Fair Value | 0 | 16,294
Less than 12 months, Unrealized Losses | 0 | 93
More than 12 months, Fair Value | 13,145 | 0
More than 12 months, Unrealized Losses | 508 | 0
Total, Fair Value | 13,145 | 16,294
Total, Unrealized Losses | $ 508 | $ 93

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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