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Note 5 - Derivatives - Cash Flow Hedges Included in Consolidated Statements of Condition (Details) - Interest Rate Swap [Member] - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Derivative, notional amount | $ 1,000,000 | $ 950,000
Derivative, fair value | $ 29,501 | $ 43,805

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