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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Due in one year or less, amortized cost	$ 292,504
Due in one year or less, fair value	292,073
Due after one year through five years, amortized cost	64,975
Due after one year through five years	64,696
Amortized cost, single maturity date, amortized cost	357,479
Fair value, single maturity date	356,769
Amortized cost	361,290	$ 156,750
Fair value	360,530	153,203
Residential Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	2,949
Fair value, without single maturity date	2,911
Amortized cost	2,949	3,431
Fair value	2,911	3,367
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	862
Fair value, without single maturity date	850
Amortized cost	862	1,023
Fair value	$ 850	$ 1,003

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