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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available for sale, due within one year, amortized cost	$ 188,484
Securities available for sale, due within one year, fair value	185,298
Securities available for sale, due after one year but within five years, amortized cost	48,727
Securities available for sale, due after one year but within five years, fair value	46,419
Securities available for sale, due after five years but within ten years, amortized cost	1,944
Securities available for sale, due after five years but within ten years, fair value	1,930
Securities available for sale, single maturity date, amortized cost	239,155
Securities available for sale, single maturity date, fair value	233,647
Total debt securities available for sale, amortized cost	332,556	$ 320,123
Total debt securities available for sale	314,373	$ 300,349	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	93,401
Agency mortgage-backed securities, fair value	$ 80,726
[1] Derived from audited financial statements

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