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, 2024	Dec. 31, 2023
Derivative, notional amount	$ 1,000,000	$ 950,000
Derivative, fair value	$ 48,734	$ 43,805