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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 751,015 | $ 798,703
Gross unrealized gains | 64 | 135
Gross unrealized losses | (60,236) | (62,449)
Estimated fair value | 690,843 | 736,389
US Treasury Securities [Member] |  |
Amortized cost | 195,837 | 213,646
Gross unrealized gains | 11 | 29
Gross unrealized losses | (12,242) | (13,587)
Estimated fair value | 183,606 | 200,088
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 101,005 | 99,455
Gross unrealized gains | 6 | 2
Gross unrealized losses | (6,502) | (6,842)
Estimated fair value | 94,509 | 92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Amortized cost | 108,189 | 115,988
Gross unrealized gains | 4 | 0
Gross unrealized losses | (14,045) | (14,124)
Estimated fair value | 94,148 | 101,864
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 272,917 | 292,475
Gross unrealized gains | 43 | 93
Gross unrealized losses | (22,073) | (22,677)
Estimated fair value | 250,887 | 269,891
Corporate Debt Securities [Member] |  |
Amortized cost | 73,067 | 77,139
Gross unrealized gains | 0 | 11
Gross unrealized losses | (5,374) | (5,219)
Estimated fair value | $ 67,693 | $ 71,931

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