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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale, amortized costs | $ 687,097 | $ 680,496
Securities available-for-sale, gross unrealized gains | 32 | 24
Securities available-for-sale, gross unrealized losses | 56,646 | 78,622
Securities available-for-sale, fair values | 630,483 | 601,898
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 322,309 | 351,136
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 26,437 | 40,012
Securities available-for-sale, fair values | 295,872 | 311,124
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 177,617 | 178,106
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 25,612 | 32,372
Securities available-for-sale, fair values | 152,005 | 145,734
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 181,664 | 143,747
Securities available-for-sale, gross unrealized gains | 32 | 24
Securities available-for-sale, gross unrealized losses | 4,033 | 5,473
Securities available-for-sale, fair values | 177,663 | 138,298
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 5,507 | 6,507
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 564 | 764
Securities available-for-sale, fair values | $ 4,943 | 5,743
US Treasury Securities [Member] |  |
Securities available-for-sale, amortized costs |  | 1,000
Securities available-for-sale, gross unrealized gains |  | 0
Securities available-for-sale, gross unrealized losses |  | 1
Securities available-for-sale, fair values |  | $ 999

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