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Note 14 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Net change in unrealized holding loss on cash flow hedge derivatives |  |  |  | $ 0 | $ (774) |
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 625,987 |  | $ 625,987 |  | $ 875,117
Weighted average fixed rate-pay |  | 4.03% |  | 4.03% |  | 3.55%
Weighted average variable rate spread |  | 0.19% |  | 0.19% |  | 0.22%
Weighted average variable rate-receive |  | 4.51% |  | 4.51% |  | 5.36%
Net change in unrealized holding loss on cash flow hedge derivatives | [1] |  |  | $ (2,594) |  | $ 3,644
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Notional |  | $ 26,300 |  | 26,300 |  | $ 32,700
Periodic net settlement of swaps | [2] | $ 510 | $ 3,646 | $ 2,844 | $ 14,121 |
[1] | the amount is included in other non-interest income.
[2] | the amount of periodic net settlement of interest rate swaps was included in interest income.

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