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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of HTM and AFS Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | $ 795,699 |  | $ 683,707 |  |  |
Securities HTM, Allowance for Credit (Losses) | (203) | $ (203) | (203) |  |  |
Securities HTM, Gross Unrealized Gains | 34,994 |  | 33,429 |  |  |
Securities HTM, Gross Unrealized (Losses) | (38,831) |  | (36,654) |  |  |
Securities HTM, Fair Value | 791,659 |  | 680,279 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 334,466 |  | 348,633 |  |  |
Securities AFS, Allowance for Credit (Losses) |  |  | (989) |  |  |
Securities AFS, Gross Unrealized Gains | 157 |  | 190 |  |  |
Securities AFS, Gross Unrealized (Losses) | (42,758) |  | (48,179) |  |  |
Securities AFS, Fair Value | 291,865 |  | 299,655 |  |  |
U.S. treasuries and govt. sponsored agency securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 20,622 |  | 17,399 |  |  |
Securities AFS, Gross Unrealized Gains | 13 |  | 12 |  |  |
Securities AFS, Gross Unrealized (Losses) | (2,014) |  | (2,438) |  |  |
Securities AFS, Fair Value | 18,621 |  | 14,973 |  |  |
Residential mortgage-backed and related securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 57,924 |  | 65,168 |  |  |
Securities AFS, Gross Unrealized Gains | 5 |  |  |  |  |
Securities AFS, Gross Unrealized (Losses) | (4,442) |  | (5,972) |  |  |
Securities AFS, Fair Value | 53,487 |  | 59,196 |  |  |
Municipal securities |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | 794,649 |  | 682,657 |  |  |
Securities HTM, Allowance for Credit (Losses) | (202) | (202) | (202) | $ (180) | $ (180) | $ (180)
Securities HTM, Gross Unrealized Gains | 34,994 |  | 33,385 |  |  |
Securities HTM, Gross Unrealized (Losses) | (38,831) |  | (36,639) |  |  |
Securities HTM, Fair Value | 790,610 |  | 679,201 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 204,879 |  | 206,566 |  |  |
Securities AFS, Gross Unrealized Gains | 5 |  | 11 |  |  |
Securities AFS, Gross Unrealized (Losses) | (33,722) |  | (35,590) |  |  |
Securities AFS, Fair Value | 171,162 |  | 170,987 |  |  |
Asset-backed securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 10,326 |  | 15,261 |  |  |
Securities AFS, Gross Unrealized Gains | 129 |  | 167 |  |  |
Securities AFS, Gross Unrealized (Losses) |  |  | (5) |  |  |
Securities AFS, Fair Value | 10,455 |  | 15,423 |  |  |
Other securities |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |
Securities HTM, Amortized cost | 1,050 |  | 1,050 |  |  |
Securities HTM, Allowance for Credit (Losses) | (1) | $ (1) | (1) |  |  |
Securities HTM, Gross Unrealized Gains |  |  | 44 |  |  |
Securities HTM, Gross Unrealized (Losses) |  |  | (15) |  |  |
Securities HTM, Fair Value | 1,049 |  | 1,078 |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Amortized Cost | 40,715 |  | 44,239 |  |  |
Securities AFS, Allowance for Credit (Losses) |  |  | (989) | (989) |  |
Securities AFS, Gross Unrealized Gains | 5 |  |  |  |  |
Securities AFS, Gross Unrealized (Losses) | (2,580) |  | (4,174) |  |  |
Securities AFS, Fair Value | $ 38,140 |  | 39,076 |  |  |
Corporate securities |  |  |  |  |  |
Securities AFS: |  |  |  |  |  |
Securities AFS, Allowance for Credit (Losses) |  |  | $ (989) | $ (989) | $ (989) |

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