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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized cost	$ 242,636	$ 156,750
Gross unrealized gains	49	46
Gross unrealized losses	(3,136)	(3,593)
Fair value	239,549	153,203
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	929	930
Gross unrealized gains	3	12
Gross unrealized losses	(6)	(8)
Fair value	926	934
US Treasury Securities [Member]
Amortized cost	95,524	115,920
Gross unrealized gains	0	0
Gross unrealized losses	(2,815)	(3,412)
Fair value	92,709	112,508
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost	141,851	35,446
Gross unrealized gains	20	7
Gross unrealized losses	(195)	(62)
Fair value	141,676	35,391
Residential Mortgage-Backed Securities [Member]
Amortized cost	3,342	3,431
Gross unrealized gains	26	27
Gross unrealized losses	(102)	(91)
Fair value	3,266	3,367
Collateralized Mortgage-Backed Securities [Member]
Amortized cost	990	1,023
Gross unrealized gains	0	0
Gross unrealized losses	(18)	(20)
Fair value	$ 972	$ 1,003

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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