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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 2,636 |
Securities held to maturity, due in one year or less, fair value | 2,651 |
Securities held to maturity, due after one year through five years, amortized cost | 23,246 |
Securities held to maturity, due after one year through five years, fair value | 23,800 |
Securities held to maturity, due after five years, amortized cost | 446,701 |
Securities held to maturity, due after five years, fair value | 495,846 |
Securities held to maturity, amortized cost | 472,583 |
Securities held to maturity, fair value | 522,297 | $ 521,277
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 5,873 |
Securities available for sale, Due in one year or less, fair value | 5,943 |
Securities available for sale, due after one year through five years, amortized cost | 5,600 |
Securities available for sale, Due after one year through five years, fair value | 5,764 |
Securities available for sale, due after five years, amortized cost | 199,718 |
Securities available for sale, due after five years, fair value | 204,676 |
Securities available for sale, single maturity, amortized cost | 211,191 |
Securities available for sale, single maturity, fair value | 216,383 |
Securities available for sale, amortized cost | 329,994 | 350,060
Securities available for sale, fair value | 337,830 | 361,966
Securities available for sale, callable, amortized cost | 329,994 |
Securities available for sale, callable, fair value | 337,830 |
Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 182,830 |
Securities available for sale, fair value | 187,859 |
Municipal securities. |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 521,248 | 520,227
Securities available for sale: |  |
Securities available for sale, amortized cost | 163,253 | 147,241
Securities available for sale, fair value | 168,266 | 152,408
Municipal securities. | Callable Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 278,699 |
Securities held to maturity, callable, fair value | 289,939 |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 158,262 |
Securities available for sale, callable, fair value | 163,070 |
Asset-backed securities |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 26,372 | 39,663
Securities available for sale, fair value | 27,124 | 40,683
Securities available for sale, callable, amortized cost | 26,372 |
Securities available for sale, callable, fair value | 27,124 |
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 92,431 | 127,670
Securities available for sale, fair value | 94,323 | 132,842
Securities available for sale, callable, amortized cost | 92,431 |
Securities available for sale, callable, fair value | 94,323 |
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 1,049 | 1,050
Securities available for sale: |  |
Securities available for sale, amortized cost | 24,568 | 20,550
Securities available for sale, fair value | 24,789 | $ 20,697
Other Securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 24,568 |
Securities available for sale, callable, fair value | $ 24,789 |

X
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