Note 3 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Due in one year or less, amortized cost	$ 5,451
Due in one year or less, fair value	5,444
Due after one year through five years, amortized cost	4,106
Due after one year through five years, fair value	4,107
Due after five years through ten years, amortized cost	2,342
Due after five years through ten years, fair value	2,289
Due after ten years, amortized cost	212,370
Due after ten years, fair value	183,775
Total securities available-for-sale, amortized cost	718,732	$ 535,182
Total securities available-for-sale, fair value	623,629	534,507
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	468,783
Securities available-for-sale, without single maturity date, fair value	406,985
Total securities available-for-sale, amortized cost	468,783	317,111
Total securities available-for-sale, fair value	406,985	316,095
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,546
Securities available-for-sale, without single maturity date, fair value	20,895
Total securities available-for-sale, amortized cost	25,546	10,814
Total securities available-for-sale, fair value	20,895	10,469
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	134
Securities available-for-sale, without single maturity date, fair value	134
Total securities available-for-sale, amortized cost	134	195
Total securities available-for-sale, fair value	$ 134	$ 195