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Note 4 - DERIVATIVES AND HEDGING ACTIVITIES - Hedged Interest Rate Swaps and Non-hedged Interest Rate Swaps (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |
Swapped loan portfolio loan-to-value percentage, including the potential swap exposure | 65.00% |
Interest rate swaps |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 10,998 | $ 38,756
Interest rate swaps | Cash |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 1,275 | 1,272
Interest rate swaps | Municipal securities. |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | 3,945 | 8,227
Interest rate swaps | Residential mortgage-backed and related securities |  |
Derivative [Line Items] |  |
Interest rate swaps collateralized by investment securities | $ 5,778 | $ 29,257

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