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Note 3 - Loans (Details Textual) Pure in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss | $ 164,458,000 | $ 153,317,000 | $ 146,297,000 | $ 116,660,000
Provision for credit losses | 21,553,000 | 18,715,000 | $ 37,607,000 |
Financing Receivable, Nonaccrual, Interest Income | $ 0 | $ 0 |  |
Financing Receivable, Modified, Subsequent Default, Number of Contracts | 0 | 0 |  |
Unfunded Loan Commitment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 608,000 | $ 575,000 |  |
Provision for credit losses | $ 32,000 | $ 0 |  |

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