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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities available-for-sale, amortized costs | $ 688,796 | $ 697,786
Securities available-for-sale, gross unrealized gains | 27 | 0
Securities available-for-sale, gross unrealized losses | 83,627 | 79,185
Securities available-for-sale, fair values | 605,196 | 618,601
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 353,018 | 353,904
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 44,205 | 42,060
Securities available-for-sale, fair values | 308,813 | 311,844
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 178,435 | 179,507
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 32,433 | 29,614
Securities available-for-sale, fair values | 146,002 | 149,893
Collateralized Mortgage-Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 149,839 | 156,875
Securities available-for-sale, gross unrealized gains | 27 | 0
Securities available-for-sale, gross unrealized losses | 6,120 | 6,724
Securities available-for-sale, fair values | 143,746 | 150,151
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 6,506 | 6,504
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 849 | 754
Securities available-for-sale, fair values | 5,657 | 5,750
US Treasury Securities [Member] |  |
Securities available-for-sale, amortized costs | 998 | 996
Securities available-for-sale, gross unrealized gains | 0 | 0
Securities available-for-sale, gross unrealized losses | 20 | 33
Securities available-for-sale, fair values | $ 978 | $ 963

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