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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, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 months, Fair Value | $ 153,118 | $ 515,182
Less than 12 months, Unrealized Losses | 15,751 | 10,599
More than 12 months, Fair Value | 375,245 | 102,211
More than 12 months, Unrealized Losses | 73,290 | 4,196
Total, Fair Value | 528,363 | 617,393
Total, Unrealized Losses | 89,041 | 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 | 78,204 | 0
More than 12 months, Unrealized Losses | 12,606 | 0
Total, Fair Value | 78,204 | 89,958
Total, Unrealized Losses | 12,606 | 1,311
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, Fair Value | 89,158 | 130,001
Less than 12 months, Unrealized Losses | 12,612 | 3,253
More than 12 months, Fair Value | 140,390 | 15,237
More than 12 months, Unrealized Losses | 34,939 | 856
Total, Fair Value | 229,548 | 145,238
Total, Unrealized Losses | 47,551 | 4,109
Collateralized Mortgage-Backed Securities [Member] |  |
Less than 12 months, Fair Value | 63,249 | 261,560
Less than 12 months, Unrealized Losses | 3,093 | 5,709
More than 12 months, Fair Value | 144,318 | 86,974
More than 12 months, Unrealized Losses | 25,047 | 3,340
Total, Fair Value | 207,567 | 348,534
Total, Unrealized Losses | 28,140 | 9,049
Corporate Debt Securities [Member] |  |
Less than 12 months, Fair Value | 711 | 17,369
Less than 12 months, Unrealized Losses | 46 | 233
More than 12 months, Fair Value | 0 | 0
More than 12 months, Unrealized Losses | 0 | 0
Total, Fair Value | 711 | 17,369
Total, Unrealized Losses | 46 | 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 | 12,333 | 0
More than 12 months, Unrealized Losses | 698 | 0
Total, Fair Value | 12,333 | 16,294
Total, Unrealized Losses | $ 698 | $ 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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