Note 3 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 2,284
Due in one year or less, fair value	2,269
Due after one year through five years, amortized cost	6,362
Due after one year through five years, fair value	6,338
Due after five years through ten years, amortized cost	2,283
Due after five years through ten years, fair value	2,241
Due after ten years, amortized cost	219,744
Due after ten years, fair value	190,563
Total investment securities available-for-sale, amortized cost	710,958	$ 698,362
Investment securities	619,397	617,162
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	454,980
Securities available-for-sale, without single maturity date, fair value	396,421
Total investment securities available-for-sale, amortized cost	454,980	462,004
Investment securities	396,421	411,191
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,178
Securities available-for-sale, without single maturity date, fair value	21,438
Total investment securities available-for-sale, amortized cost	25,178	25,240
Investment securities	21,438	21,564
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	127
Securities available-for-sale, without single maturity date, fair value	127
Total investment securities available-for-sale, amortized cost	127	165
Investment securities	$ 127	$ 165

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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