Note 3 - Loans and Allowance for Credit Losses on Loans (Details Textual) Pure in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Jun. 30, 2025
USD ($)
|
Jun. 30, 2024
USD ($)
|
Dec. 31, 2024
USD ($)
|
|
| Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 23,000,000 | $ 23,000,000 | |||
| Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | 6,850,273,000 | 6,520,402,000 | |||
| Loans and Leases Receivable, Related Parties | 91,000,000 | 97,000,000 | |||
| Financing Receivable, Nonaccrual, Interest Income | 0 | $ 0 | |||
| Mortgage Loans in Process of Foreclosure, Amount | 717,000 | 569,000 | |||
| Financing Receivable, Modifications, Number of Contracts | 0 | 0 | |||
| Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 | 0 | |||
| Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] | |||||
| Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss | $ 3,650,000,000 | $ 3,480,000,000 | |||