Note 3 - Loans and Allowance for Credit Losses on Loans - Credit Card Loan Payment Activity (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|
| Loans | [1] | $ 7,226,429 | $ 7,041,310 | |
| Credit Card Receivable [Member] | ||||
| Loans | 24,920 | 25,243 | ||
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | ||||
| Loans | 24,920 | 25,243 | ||
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Performing Financial Instruments [Member] | ||||
| Loans | 24,810 | 25,191 | ||
| Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Nonperforming Financial Instruments [Member] | ||||
| Loans | $ 110 | $ 52 | ||
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