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Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized cost | $ 724,723 | $ 708,437
Gross unrealized gains | 1,162 | 484
Gross unrealized losses | (89,079) | (96,074)
Securities available-for-sale | 636,806 | 612,847
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 112,880 | 96,165
Gross unrealized gains | 571 | 179
Gross unrealized losses | (10,690) | (11,674)
Securities available-for-sale | 102,761 | 84,670
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 441,169 | 439,445
Gross unrealized gains | 572 | 211
Gross unrealized losses | (53,392) | (60,818)
Securities available-for-sale | 388,349 | 378,838
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 24,925 | 24,989
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3,874) | (4,097)
Securities available-for-sale | 21,051 | 20,892
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 139,759 | 141,775
Gross unrealized gains | 14 | 89
Gross unrealized losses | (21,116) | (19,460)
Securities available-for-sale | 118,657 | 122,404
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Corporate Debt Securities [Member] |  |
Amortized cost | 5,000 | 5,000
Gross unrealized gains | 4 | 5
Gross unrealized losses | 0 | (18)
Securities available-for-sale | 5,004 | 4,987
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Asset-Backed Securities [Member] |  |
Amortized cost | 865 | 892
Gross unrealized gains | 1 | 0
Gross unrealized losses | (7) | (7)
Securities available-for-sale | 859 | 885
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Other Debt Obligations [Member] |  |
Amortized cost | 125 | 171
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | 125 | 171
Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 | $ 0

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