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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 | Mar. 31, 2025 | Dec. 31, 2024
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Derivative, notional amount | $ 1,000,000 | $ 1,000,000
Derivative, fair value | $ 28,914 | $ 37,398

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