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Note 9 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Outstanding balance at end of period | $ 113,894 |  | $ 113,894 |  | $ 133,342
Weighted average interest rate at end of period | 1.76% |  | 1.76% |  | 1.64%
Average outstanding balance during the period | $ 127,063 | $ 139,749 | $ 120,740 | $ 123,845 |
Average interest rate during the period | 1.86% | 0.50% | 1.58% | 0.27% |
Maximum outstanding at any month end during the period | $ 127,931 | $ 139,825 | $ 138,347 | $ 149,179 |

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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) -Publisher SEC + Details
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