Note 3 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans | $ 6,850,273 | $ 6,520,402 |
| Credit Card Receivable [Member] | ||
| Loans | 26,273 | 24,540 |
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | ||
| Loans | 26,273 | 24,540 |
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member] | ||
| Loans | 26,143 | 24,370 |
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member] | ||
| Loans | $ 130 | $ 170 |