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Note 4 - Securities - Available for Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale securities, cost basis | $ 420,317 | $ 439,277
Available for sale securities, gross unrealized gains | 2 | 60
Available for sale securities, gross unrealized losses | (74,086) | (67,963)
Total securities available-for-sale | 346,233 | 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 | (1,018) | (1,001)
Total securities available-for-sale | 7,866 | 7,883
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Available for sale securities, cost basis | 145,077 | 149,410
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (27,180) | (25,946)
Total securities available-for-sale | 117,897 | 123,464
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, cost basis | 264,190 | 278,813
Available for sale securities, gross unrealized gains | 2 | 60
Available for sale securities, gross unrealized losses | (45,164) | (40,203)
Total securities available-for-sale | 219,028 | 238,670
Collateralized Debt Obligations [Member] |  |
Available for sale securities, cost basis | 2,166 | 2,170
Available for sale securities, gross unrealized gains | 0 | 0
Available for sale securities, gross unrealized losses | (724) | (813)
Total securities available-for-sale | $ 1,442 | $ 1,357

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