Note 6 - Loans and the Allowance for Credit Losses - Loans Purchased with Credit Deterioration (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
|
| Total purchased credit-deteriorated loans | $ 207,621 | $ 221,130 |
| Commercial Portfolio Segment [Member] | ||
| Total purchased credit-deteriorated loans | 4,617 | 5,398 |
| Commercial Real Estate Portfolio Segment [Member] | ||
| Total purchased credit-deteriorated loans | 201,147 | 213,770 |
| Residential Portfolio Segment [Member] | ||
| Total purchased credit-deteriorated loans | $ 1,857 | $ 1,962 |