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Note 3 - Securities - Amortized Cost and Fair Value of Securities By Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Due in one year or less, amortized cost	$ 330,291
Due in one year or less, fair value	330,041
Due after one year through five years, amortized cost	23,594
Due after one year through five years	23,501
Amortized cost, single maturity date, amortized cost	353,885
Fair value, single maturity date	353,542
Amortized cost	357,542	$ 361,290
Fair value	357,165	360,530
Residential Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	2,824
Fair value, without single maturity date	2,800
Amortized cost	2,824	2,949
Fair value	2,800	2,911
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, without single maturity date, amortized cost	833
Fair value, without single maturity date	823
Amortized cost	833	862
Fair value	$ 823	$ 850

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