Note 3 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Due in one year or less, amortized cost	$ 5,453
Due in one year or less, fair value	5,451
Due after one year through five years, amortized cost	4,106
Due after one year through five years, fair value	4,082
Due after five years through ten years, amortized cost	2,247
Due after five years through ten years, fair value	2,244
Due after ten years, amortized cost	209,003
Due after ten years, fair value	184,183
Total securities available-for-sale, amortized cost	721,799	$ 535,182
Total securities available-for-sale, fair value	634,884	534,507
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	475,263
Securities available-for-sale, without single maturity date, fair value	417,578
Total securities available-for-sale, amortized cost	475,263	317,111
Total securities available-for-sale, fair value	417,578	316,095
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,485
Securities available-for-sale, without single maturity date, fair value	21,104
Total securities available-for-sale, amortized cost	25,485	10,814
Total securities available-for-sale, fair value	21,104	10,469
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	242
Securities available-for-sale, without single maturity date, fair value	242
Total securities available-for-sale, amortized cost	242	195
Total securities available-for-sale, fair value	$ 242	$ 195