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Note 4 - Investment Securities - Scheduled Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 1,284
Due in one year or less, fair value	1,285
Due after one year through five years, amortized cost	8,048
Due after one year through five years, fair value	8,092
Due after five years through ten years, amortized cost	10,446
Due after five years through ten years, fair value	9,522
Due after ten years, amortized cost	229,970
Due after ten years, fair value	206,135
Total investment securities available-for-sale, amortized cost	716,754	$ 698,362
Investment securities	646,713	617,162
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	441,794
Securities available-for-sale, without single maturity date, fair value	399,235
Total investment securities available-for-sale, amortized cost	441,794	462,004
Investment securities	399,235	411,191
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale, without single maturity date, amortized cost	25,053
Securities available-for-sale, without single maturity date, fair value	22,285
Total investment securities available-for-sale, amortized cost	25,053	25,240
Investment securities	22,285	21,564
Other Debt Obligations [Member]
Securities available-for-sale, without single maturity date, amortized cost	159
Securities available-for-sale, without single maturity date, fair value	159
Total investment securities available-for-sale, amortized cost	159	165
Investment securities	$ 159	$ 165

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