Note 3 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Due in one year or less, amortized cost	$ 2,000
Due in one year or less, fair value	1,967
Due after one year through five years, amortized cost	4,389
Due after one year through five years, fair value	4,331
Due after five years through ten years, amortized cost	1,856
Due after five years through ten years, fair value	1,783
Due after ten years, amortized cost	203,570
Due after ten years, fair value	163,070
Total investment securities available-for-sale, amortized cost	704,842	$ 721,799
Investment securities	581,867	634,884
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	466,362
Securities available-for-sale, without single maturity date, fair value	389,427
Total investment securities available-for-sale, amortized cost	466,362	475,263
Investment securities	389,427	417,578
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,303
Securities available-for-sale, without single maturity date, fair value	19,927
Total investment securities available-for-sale, amortized cost	25,303	25,485
Investment securities	19,927	21,104
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	1,362
Securities available-for-sale, without single maturity date, fair value	1,362
Total investment securities available-for-sale, amortized cost	1,362	242
Investment securities	$ 1,362	$ 242

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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