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Note 5 - Loans and the Allowance for Credit Losses (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, after Allowance for Credit Loss | $ 8,075,826 |  | $ 8,075,826 |  | $ 8,263,171
Financing Receivable, Modified, Subsequent Default, Number of Contracts |  |  | 0 | 0 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 2 | 1 |
Financing Receivable, Modified in Period, Amount | 11,150 | $ 0 | $ 11,276 | $ 53 |
Commercial Portfolio Segment [Member] | Six-month Term Extension [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 11,100 |  |
Commercial Portfolio Segment [Member] | Three-month Payment Deferral [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 100 |  |
Commercial Portfolio Segment [Member] | Three Year Term Extension [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | 50 |
Commercial Portfolio Segment [Member] | Fifteen Year Term Extension [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 213 |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 1 |  |
Financing Receivable, Modified in Period, Amount | 1,417 |  | $ 1,417 |  |
Residential Portfolio Segment [Member] | Freezing of a Loan Commitment, Combined With a Ten-year Term Extension [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 1,400 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  |  | 1 |
Financing Receivable, Modified in Period, Amount |  | $ 213 |  | $ 213 |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 5,700,000 |  | $ 5,700,000 |  | $ 5,800,000

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