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Note 5 - Loans (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss | $ 158,092,000 | $ 152,272,000 | $ 158,092,000 | $ 152,272,000 | $ 155,892,000 | $ 153,317,000 | $ 148,965,000 | $ 146,297,000
Financing Receivable, Credit Loss, Expense (Reversal) | 5,353,000 | 6,654,000 | 9,721,000 | 10,851,000 |  |  |  |
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 1,100,000 |  | 1,100,000 |  |  | $ 575,000 |  |
Financing Receivable, Credit Loss, Expense (Reversal) | $ 336,000 | $ 0 | $ 503,000 | $ 0 |  |  |  |

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