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Note 4 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale securities, cost basis | $ 417,007 | $ 439,277
Available for sale securities, gross unrealized gains | 0 | 60
Available for sale securities, gross unrealized losses | (77,422) | (67,963)
Total securities available-for-sale | 339,585 | 371,374
US Government-sponsored Enterprises Debt Securities [Member] |  |
Available for sale securities, cost basis | 8,884 | 8,884
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (996) | (1,001)
Total securities available-for-sale | 7,888 | 7,883
US Treasury Securities [Member] |  |
Available for sale securities, cost basis | 0 | 0
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | 0 | 0
Total securities available-for-sale | 0 | 0
Collateralized Mortgage-Backed Securities [Member] |  |
Available for sale securities, cost basis | 142,094 | 149,410
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (27,313) | (25,946)
Total securities available-for-sale | 114,781 | 123,464
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 263,866 | 278,813
Available for sale securities, gross unrealized gains | 0 | 60
Available for sale securities, gross unrealized losses | (48,321) | (40,203)
Total securities available-for-sale | 215,545 | 238,670
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,163 | 2,170
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (792) | (813)
Total securities available-for-sale | $ 1,371 | $ 1,357

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