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Note 5 - Loans (Details Textual) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | $ 169,959,000 | $ 158,092,000 | $ 169,959,000 | $ 158,092,000 | $ 165,034,000 | $ 164,458,000 | [1] | $ 155,892,000 | $ 153,317,000
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 11,409,000 | 5,353,000 | $ 17,881,000 | 9,721,000 |  |  |  |  |
Financing Receivable, Modified, Subsequent Default, Number of Contracts |  |  | 1 |  |  |  |  |  |
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 655,000 |  | $ 655,000 |  |  | $ 608,000 |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | $ (113,000) |  |  |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) |  | $ 336,000 | $ 47,000 | $ 503,000 |  |  |  |  |
[1] | Derived from audited financial statements.

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