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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Outstanding balance at end of period | $ 73,149 |  | $ 73,149 |  | $ 162,967
Average outstanding balance during the period | $ 104,640 | $ 156,865 | $ 130,507 | $ 156,392 |
Weighted average interest rate at end of period | 1.89% |  | 1.89% |  | 2.10%
Average interest rate during the period | 2.23% | 2.38% | 2.08% | 2.25% |
Maximum outstanding at any month end during the period | $ 113,304 | $ 175,211 | $ 151,483 | $ 179,428 |

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