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Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities HTM: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 1,907 |
Securities held to maturity, due in one year or less, fair value | 1,882 |
Securities held to maturity, due after one year through five years, amortized cost | 27,159 |
Securities held to maturity, due after one year through five years, fair value | 27,700 |
Securities held to maturity, due after five years, amortized cost | 586,229 |
Securities held to maturity, due after five years, fair value | 495,237 |
Securities HTM, Amortized cost | 615,295 | $ 587,322
Securities held to maturity, fair value | 524,819 | 535,636
Securities AFS: |  |
Securities available for sale, due in one year or less, amortized cost | 3,160 |
Securities available for sale, Due in one year or less, fair value | 3,146 |
Securities available for sale, due after one year through five years, amortized cost | 14,338 |
Securities available for sale, Due after one year through five years, fair value | 12,239 |
Securities available for sale, due after five years, amortized cost | 255,481 |
Securities available for sale, due after five years, fair value | 191,622 |
Securities available for sale, single maturity, amortized cost | 272,979 |
Securities available for sale, single maturity, fair value | 207,007 |
Securities AFS, Amortized Cost | 355,638 | 400,511
Available-for-sale Securities, Debt Securities, Total | 281,279 | 340,960
Callable Securities [Member] |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 251,324 |
Available-for-sale Securities, Debt Securities, Total | 188,512 |
Municipal securities. |  |
Securities HTM: |  |
Securities HTM, Amortized cost | 614,245 | 586,272
Securities held to maturity, fair value | 523,795 | 534,586
Securities AFS: |  |
Securities AFS, Amortized Cost | 207,318 | 239,812
Available-for-sale Securities, Debt Securities, Total | 149,772 | 193,178
Municipal securities. | Callable Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, callable, amortized cost | 230,493 |
Securities held to maturity, callable, fair value | 194,222 |
Securities AFS: |  |
Securities available for sale, callable, amortized cost | 205,747 |
Securities available for sale, callable, fair value | 148,235 |
Asset-backed securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 16,226 | 18,885
Available-for-sale Securities, Debt Securities, Total | 16,326 | 18,728
Securities available for sale, callable, amortized cost | 16,226 |
Securities available for sale, callable, fair value | 16,326 |
Residential mortgage-backed and related securities |  |
Securities AFS: |  |
Securities AFS, Amortized Cost | 66,433 | 73,438
Available-for-sale Securities, Debt Securities, Total | 57,946 | 66,215
Securities available for sale, callable, amortized cost | 66,433 |
Securities available for sale, callable, fair value | 57,946 |
Other securities |  |
Securities HTM: |  |
Securities HTM, Amortized cost | 1,050 | 1,050
Securities held to maturity, fair value | 1,024 | 1,050
Securities AFS: |  |
Securities AFS, Amortized Cost | 46,531 | 48,631
Available-for-sale Securities, Debt Securities, Total | 41,233 | $ 45,858
Other securities | Callable Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, callable, amortized cost | 45,577 |
Securities available for sale, callable, fair value | $ 40,277 |

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