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Note 4 - 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 | Jun. 30, 2023 | Dec. 31, 2022
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Derivative, notional amount | $ 950,000 | $ 950,000
Derivative, fair value | $ 57,545 | $ 56,797

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