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Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost | $ 710,958 | $ 698,362
Gross unrealized gains | 645 | 1,224
Gross unrealized losses | (92,206) | (82,424)
Securities available-for-sale | 619,397 | 617,162
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 76,953 | 55,898
Gross unrealized gains | 190 | 189
Gross unrealized losses | (11,411) | (10,761)
Securities available-for-sale | 65,732 | 45,326
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 454,980 | 462,004
Gross unrealized gains | 289 | 620
Gross unrealized losses | (58,848) | (51,433)
Securities available-for-sale | 396,421 | 411,191
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 25,178 | 25,240
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3,740) | (3,676)
Securities available-for-sale | 21,438 | 21,564
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 147,553 | 148,795
Gross unrealized gains | 166 | 415
Gross unrealized losses | (18,163) | (16,505)
Securities available-for-sale | 129,556 | 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 | 0 | 0
Gross unrealized losses | (29) | (27)
Securities available-for-sale | 4,971 | 4,973
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Asset-Backed Securities [Member] |  |
Amortized cost | 1,167 | 1,260
Gross unrealized gains | 0 | 0
Gross unrealized losses | (15) | (22)
Securities available-for-sale | 1,152 | 1,238
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Other Debt Obligations [Member] |  |
Amortized cost | 127 | 165
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | 127 | 165
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 | $ 0

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