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Note 2 - INVESTMENT SECURITIES - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 3,592 |
Securities held to maturity, due in one year or less, fair value | 3,611 |
Securities held to maturity, due after one year through five years, amortized cost | 32,784 |
Securities held to maturity, due after one year through five years, fair value | 33,424 |
Securities held to maturity, due after five years, amortized cost | 416,750 |
Securities held to maturity, due after five years, fair value | 454,312 |
Securities held to maturity, amortized cost | 453,126 |
Securities held to maturity, fair value | 491,347 | $ 521,277
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 2,152 |
Securities available for sale, Due in one year or less, fair value | 2,182 |
Securities available for sale, due after one year through five years, amortized cost | 12,888 |
Securities available for sale, Due after one year through five years, fair value | 13,175 |
Securities available for sale, due after five years, amortized cost | 171,836 |
Securities available for sale, due after five years, fair value | 173,649 |
Securities available for sale, single maturity, amortized cost | 186,876 |
Securities available for sale, single maturity, fair value | 189,006 |
Securities available for sale, amortized cost | 340,726 | 350,060
Securities available for sale, fair value | 346,873 | 361,966
Securities available for sale, callable, amortized cost | 340,726 |
Securities available for sale, callable, fair value | 346,873 |
Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 166,111 |
Securities available for sale, fair value | 167,868 |
Municipal securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 490,297 | 520,227
Securities available for sale: |  |
Securities available for sale, amortized cost | 160,703 | 147,241
Securities available for sale, fair value | 162,573 | 152,408
Municipal securities | Callable Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 246,515 |
Securities held to maturity, callable, fair value | 255,969 |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 154,432 |
Securities available for sale, callable, fair value | 156,016 |
Asset-backed securities |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 38,620 | 39,663
Securities available for sale, fair value | 39,815 | 40,683
Securities available for sale, callable, amortized cost | 38,620 |
Securities available for sale, callable, fair value | 39,815 |
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 115,230 | 127,670
Securities available for sale, fair value | 118,052 | 132,842
Securities available for sale, callable, amortized cost | 115,230 |
Securities available for sale, callable, fair value | 118,052 |
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 1,050 | 1,050
Securities available for sale: |  |
Securities available for sale, amortized cost | 11,679 | 20,550
Securities available for sale, fair value | 11,852 | $ 20,697
Other Securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 11,679 |
Securities available for sale, callable, fair value | $ 11,852 |

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