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Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 716,754 | $ 698,362
Gross unrealized gains | 1,966 | 1,224
Gross unrealized losses | (72,007) | (82,424)
Securities available-for-sale | 646,713 | 617,162
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 100,284 | 55,898
Gross unrealized gains | 596 | 189
Gross unrealized losses | (10,070) | (10,761)
Securities available-for-sale | 90,810 | 45,326
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 441,794 | 462,004
Gross unrealized gains | 937 | 620
Gross unrealized losses | (43,496) | (51,433)
Securities available-for-sale | 399,235 | 411,191
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 25,053 | 25,240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2,768) | (3,676)
Securities available-for-sale | 22,285 | 21,564
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 143,547 | 148,795
Gross unrealized gains | 422 | 415
Gross unrealized losses | (15,662) | (16,505)
Securities available-for-sale | 128,307 | 132,705
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Corporate Debt Securities [Member] |  |
Amortized cost | 5,000 | 5,000
Gross unrealized gains | 11 | 0
Gross unrealized losses | 0 | (27)
Securities available-for-sale | 5,011 | 4,973
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Asset-Backed Securities [Member] |  |
Amortized cost | 917 | 1,260
Gross unrealized gains | 0 | 0
Gross unrealized losses | (11) | (22)
Securities available-for-sale | 906 | 1,238
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Other Debt Obligations [Member] |  |
Amortized cost | 159 | 165
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | 159 | 165
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 | $ 0

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