Note 6 - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Due in one year or less, Fair value	$ 7,567
Due after one year through five years, Fair value	58,360
Due after five years through ten years, Fair value	39,424
Due after ten years, Fair value	69,410
Total fair value	174,761
Investment debt securities available-for-sale, Fair value	481,596	$ 490,182
Due in one year or less, Amortized cost	7,606
Due after one year through five years, Amortized cost	65,933
Due after five years through ten years, Amortized cost	44,892
Due after ten years, Amortized cost	86,758
Total amortized cost	205,189
Investment securities available-for-sale, debt securities amortized cost	565,864	576,178
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Investment debt securities available-for-sale, Fair value	220,271
Investment securities available-for-sale, debt securities amortized cost	257,218
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Investment debt securities available-for-sale, Fair value	86,564	89,973
Investment securities available-for-sale, debt securities amortized cost	$ 103,457	$ 106,356