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Note 3 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 3,061 |
Securities held to maturity, due in one year or less, fair value | 3,046 |
Securities held to maturity, due after one year through five years, amortized cost | 15,199 |
Securities held to maturity, due after one year through five years, fair value | 14,862 |
Securities held to maturity, due after five years, amortized cost | 521,651 |
Securities held to maturity, due after five years, fair value | 493,539 |
Securities held to maturity, amortized cost | 539,911 |
Securities held to maturity, fair value | 511,447 | $ 522,297
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 8,558 |
Securities available for sale, Due in one year or less, fair value | 8,535 |
Securities available for sale, due after one year through five years, amortized cost | 3,760 |
Securities available for sale, Due after one year through five years, fair value | 3,705 |
Securities available for sale, due after five years, amortized cost | 300,063 |
Securities available for sale, due after five years, fair value | 239,023 |
Securities available for sale, single maturity, amortized cost | 312,381 |
Securities available for sale, single maturity, fair value | 251,263 |
Debt Securities, Available-for-sale, Amortized Cost | 408,715 | 329,994
Available-for-sale Securities, Debt Securities, Total | 339,737 | 337,830
Callable Securities [Member] |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 283,382 |
Available-for-sale Securities, Debt Securities, Total | 225,218 |
Municipal securities. |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 510,403 | 521,248
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 241,292 | 163,253
Available-for-sale Securities, Debt Securities, Total | 185,343 | 168,266
Municipal securities. | Callable Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 305,743 |
Securities held to maturity, callable, fair value | 295,096 |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 237,105 |
Securities available for sale, callable, fair value | 181,201 |
Asset-backed securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 19,654 | 26,372
Available-for-sale Securities, Debt Securities, Total | 19,630 | 27,124
Securities available for sale, callable, amortized cost | 19,654 |
Securities available for sale, callable, fair value | 19,630 |
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 76,680 | 92,431
Available-for-sale Securities, Debt Securities, Total | 68,844 | 94,323
Securities available for sale, callable, amortized cost | 76,680 |
Securities available for sale, callable, fair value | 68,844 |
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 1,044 | 1,049
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 47,700 | 24,568
Available-for-sale Securities, Debt Securities, Total | 45,393 | $ 24,789
Other Securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 46,277 |
Securities available for sale, callable, fair value | $ 44,017 |

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