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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale, due within one year, amortized cost	$ 157,230
Securities available for sale, due within one year, fair value	154,233
Securities available for sale, due after one year but within five years, amortized cost	70,343
Securities available for sale, due after one year but within five years, fair value	68,145
Securities available for sale, due after five years but within ten years, amortized cost	2,534
Securities available for sale, due after five years but within ten years, fair value	2,535
Securities available for sale, single maturity date, amortized cost	230,107
Securities available for sale, single maturity date, fair value	224,913
Total debt securities available for sale, amortized cost	324,887	$ 320,123
Total debt securities available for sale	308,269	$ 300,349	[1]
Collateralized Mortgage-Backed Securities [Member]
Agency mortgage-backed securities, amortized cost	94,780
Agency mortgage-backed securities, fair value	$ 83,356
[1] Derived from audited financial statements

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