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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities HTM: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 1,876 |
Securities held to maturity, due in one year or less, fair value | 1,867 |
Securities held to maturity, due after one year through five years, amortized cost | 27,293 |
Securities held to maturity, due after one year through five years, fair value | 29,060 |
Securities held to maturity, due after five years, amortized cost | 654,538 |
Securities held to maturity, due after five years, fair value | 649,352 |
Securities HTM, Amortized cost | 683,707 | $ 587,322
Securities held to maturity, fair value | 680,279 | 535,636
Securities AFS: |  |
Securities available for sale, due in one year or less, amortized cost | 968 |
Securities available for sale, Due in one year or less, fair value | 964 |
Securities available for sale, due after one year through five years, amortized cost | 16,819 |
Securities available for sale, Due after one year through five years, fair value | 14,815 |
Securities available for sale, due after five years, amortized cost | 250,417 |
Securities available for sale, due after five years, fair value | 209,257 |
Securities available for sale, single maturity, amortized cost | 268,204 |
Securities available for sale, single maturity, fair value | 225,036 |
Securities AFS, Amortized Cost | 348,633 | 400,511
Available-for-sale Securities, Debt Securities, Total | 299,655 | 340,960
Callable Securities [Member] |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 248,448 |
Available-for-sale Securities, Debt Securities, Total | 207,737 |
Municipal securities. |  |
Securities HTM: |  |
Securities HTM, Amortized cost | 682,657 | 586,272
Securities held to maturity, fair value | 679,201 | 534,586
Securities AFS: |  |
Securities AFS, Amortized Cost | 206,566 | 239,812
Available-for-sale Securities, Debt Securities, Total | 170,987 | 193,178
Municipal securities. | Callable Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, callable, amortized cost | 261,340 |
Securities held to maturity, callable, fair value | 257,714 |
Securities AFS: |  |
Securities available for sale, callable, amortized cost | 205,165 |
Securities available for sale, callable, fair value | 169,604 |
Asset-backed securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 15,261 | 18,885
Available-for-sale Securities, Debt Securities, Total | 15,423 | 18,728
Securities available for sale, callable, amortized cost | 15,261 |
Securities available for sale, callable, fair value | 15,423 |
Residential mortgage-backed and related securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 65,168 | 73,438
Available-for-sale Securities, Debt Securities, Total | 59,196 | 66,215
Securities available for sale, callable, amortized cost | 65,168 |
Securities available for sale, callable, fair value | 59,196 |
Other securities |  |
Securities HTM: |  |
Securities HTM, Amortized cost | 1,050 | 1,050
Securities held to maturity, fair value | 1,078 | 1,050
Securities AFS: |  |
Securities AFS, Amortized Cost | 44,239 | 48,631
Available-for-sale Securities, Debt Securities, Total | 39,076 | $ 45,858
Other securities | Callable Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, callable, amortized cost | 43,283 |
Securities available for sale, callable, fair value | $ 38,133 |

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