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Note 6 - Loans and the Allowance for Credit Losses (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, after Allowance for Credit Loss | $ 8,029,482 |  | $ 8,029,482 |  | $ 8,263,171
Financing Receivable, Held-for-Sale | 0 |  | 0 |  | 0
Financing Receivable, 90 Days or More Past Due, Still Accruing | $ 3,200 |  | $ 3,200 |  |
Financing Receivable, Loan-to-value Percentage | 65.00% |  | 65.00% |  |
Financing Receivable, Modified in Period, Amount | $ 70,295 | $ 211 | $ 82,988 | $ 255 |
Financing Receivable, Modified, Commitment to Lend | 0 | 0 | $ 0 | $ 0 |
Financing Receivable, Modified, Subsequent Default, Number of Contracts |  |  | 0 | 0 |
Extended Maturity [Member] |  |  |  |  |
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month) |  |  |  | 13 years |
Financing Receivable, Modified in Period, Amount | 6,491 | 211 | $ 19,058 | $ 255 |
Payment Deferral [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 0 | 0 | 126 | 0 |
Contractual Interest Rate Reduction [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 63,804 | 0 | $ 63,804 | 0 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 3 |  |
Financing Receivable, Modified in Period, Amount | 6,491 | 0 | $ 17,767 | 44 |
Commercial Portfolio Segment [Member] | Extended Maturity [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 2 |  |
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month) |  |  | 6 months |  |
Financing Receivable, Modified in Period, Amount | $ 6,491 | 0 | $ 17,641 | 44 |
Commercial Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 1 |  |
Financing Receivable, Modified, Payment Deferral, Period (Month) | 3 months |  | 3 months |  |
Financing Receivable, Modified in Period, Amount | $ 0 | 0 | $ 126 | 0 |
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 0 | 0 | $ 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 9 |  |
Financing Receivable, Modified in Period, Amount | 63,804 | 211 | $ 63,804 | 211 |
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 0 | 211 | 0 | 211 |
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount | 0 |  | $ 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 9 |  |
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification |  |  | 0.15% |  |
Financing Receivable, Modified in Period, Amount | 63,804 |  | $ 63,804 | $ 0 |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Trouble Debt Restructuring, Number of Contracts |  |  | 1 |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 1,417 |  |
Residential Portfolio Segment [Member] | Extended Maturity [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 1,417 |  |
Residential Portfolio Segment [Member] | Payment Deferral [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 0 |  |
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 0 |  |
Residential Portfolio Segment [Member] | Freezing of a Loan Commitment, Combined With a Ten-year Term Extension [Member] |  |  |  |  |
Financing Receivable, Modified, Weighted Average Term Increase from Modification (Month) |  |  | 10 years |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 1,400 |  |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 5,900,000 |  | $ 5,900,000 |  | $ 5,800,000

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