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Note 6 - Loans and the Allowance for Credit Losses (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Financing Receivable, after Allowance for Credit Loss | $ 8,118,731 |  | $ 8,192,125
Financing Receivable, Modified, Commitment to Lend | $ 0 | $ 0 |
Financing Receivable, Modified, Subsequent Default, Number of Contracts | 0 | 0 |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 5,600,000 |  | $ 5,800,000

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