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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | $ 615,295 |  | $ 587,322 |  |  |
Securities HTM, Allowance for Credit (Losses) | (180) |  | (180) |  |  |
Securities HTM, Gross Unrealized Gains | 2,448 |  | 5,292 |  |  |
Securities HTM, Gross Unrealized (Losses) | (92,744) |  | (56,798) |  |  |
Securities HTM, Fair Value | 524,819 |  | 535,636 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 355,638 |  | 400,511 |  |  |
Securities AFS, Allowance for Credit (Losses) | (989) |  |  |  |  |
Securities AFS, Gross Unrealized Gains | 159 |  | 160 |  |  |
Securities AFS, Gross Unrealized (Losses) | (73,529) |  | (59,711) |  |  |
Securities AFS, Fair Value | 281,279 |  | 340,960 |  |  |
U.S. treasuries and govt. sponsored agency securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 19,130 |  | 19,745 |  |  |
Securities AFS, Gross Unrealized Gains | 13 |  | 19 |  |  |
Securities AFS, Gross Unrealized (Losses) | (3,141) |  | (2,783) |  |  |
Securities AFS, Fair Value | 16,002 |  | 16,981 |  |  |
Residential mortgage-backed and related securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 66,433 |  | 73,438 |  |  |
Securities AFS, Gross Unrealized (Losses) | (8,487) |  | (7,223) |  |  |
Securities AFS, Fair Value | 57,946 |  | 66,215 |  |  |
Municipal securities. |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | 614,245 |  | 586,272 |  |  |
Securities HTM, Allowance for Credit (Losses) | (180) | $ (180) | (180) | $ (198) | $ (198) | $ (198)
Securities HTM, Gross Unrealized Gains | 2,448 |  | 5,292 |  |  |
Securities HTM, Gross Unrealized (Losses) | (92,718) |  | (56,798) |  |  |
Securities HTM, Fair Value | 523,795 |  | 534,586 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 207,318 |  | 239,812 |  |  |
Securities AFS, Gross Unrealized Gains |  |  | 66 |  |  |
Securities AFS, Gross Unrealized (Losses) | (57,546) |  | (46,700) |  |  |
Securities AFS, Fair Value | 149,772 |  | 193,178 |  |  |
Asset-backed securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 16,226 |  | 18,885 |  |  |
Securities AFS, Gross Unrealized Gains | 144 |  | 48 |  |  |
Securities AFS, Gross Unrealized (Losses) | (44) |  | (205) |  |  |
Securities AFS, Fair Value | 16,326 |  | 18,728 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Allowance for Credit (Losses) | (989) | $ (989) |  |  |  |
Other securities |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | 1,050 |  | 1,050 |  |  |
Securities HTM, Gross Unrealized (Losses) | (26) |  |  |  |  |
Securities HTM, Fair Value | 1,024 |  | 1,050 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 46,531 |  | 48,631 |  |  |
Securities AFS, Allowance for Credit (Losses) | (989) |  |  |  |  |
Securities AFS, Gross Unrealized Gains | 2 |  | 27 |  |  |
Securities AFS, Gross Unrealized (Losses) | (4,311) |  | (2,800) |  |  |
Securities AFS, Fair Value | $ 41,233 |  | $ 45,858 |  |  |

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