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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Outstanding balance at end of period | $ 138,347 |  | $ 138,347 |  | $ 133,342
Weighted average interest rate at end of period | 1.72% |  | 1.72% |  | 1.64%
Average outstanding balance during the period | $ 113,051 | $ 140,169 | $ 117,525 | $ 115,761 |
Average interest rate during the period | 1.33% | 0.16% | 1.43% | 0.13% |
Maximum outstanding at any month end during the period | $ 138,347 | $ 161,512 | $ 138,347 | $ 161,512 |

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