Note 3 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Due in one year or less, amortized cost	$ 2,453
Due in one year or less, fair value	2,453
Due after one year through five years, amortized cost	4,079
Due after one year through five years, fair value	4,057
Due after five years through ten years, amortized cost	2,626
Due after five years through ten years, fair value	2,620
Due after ten years, amortized cost	204,749
Due after ten years, fair value	178,112
Total securities available-for-sale, amortized cost	709,388	$ 721,799
Total securities available-for-sale, fair value	629,001	634,884
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	469,925
Securities available-for-sale, without single maturity date, fair value	419,667
Total securities available-for-sale, amortized cost	469,925	475,263
Total securities available-for-sale, fair value	419,667	417,578
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,424
Securities available-for-sale, without single maturity date, fair value	21,960
Total securities available-for-sale, amortized cost	25,424	25,485
Total securities available-for-sale, fair value	21,960	21,104
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	132
Securities available-for-sale, without single maturity date, fair value	132
Total securities available-for-sale, amortized cost	132	242
Total securities available-for-sale, fair value	$ 132	$ 242