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Note 3 - Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 225,237 | $ 156,750
Gross unrealized gains | 30 | 46
Gross unrealized losses | (2,361) | (3,593)
Fair value | 222,906 | 153,203
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 929 | 930
Gross unrealized gains | 0 | 12
Gross unrealized losses | (4) | (8)
Fair value | 925 | 934
US Treasury Securities [Member] |  |
Amortized cost | 77,128 | 115,920
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2,069) | (3,412)
Fair value | 75,059 | 112,508
US Government-sponsored Enterprises Debt Securities [Member] |  |
Amortized cost | 142,987 | 35,446
Gross unrealized gains | 3 | 7
Gross unrealized losses | (174) | (62)
Fair value | 142,816 | 35,391
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 3,255 | 3,431
Gross unrealized gains | 27 | 27
Gross unrealized losses | (98) | (91)
Fair value | 3,184 | 3,367
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized cost | 938 | 1,023
Gross unrealized gains | 0 | 0
Gross unrealized losses | (16) | (20)
Fair value | $ 922 | $ 1,003

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