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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of HTM and AFS Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Securities HTM: |  |  |  |
Securities HTM, Amortized cost | $ 874,294 | $ 836,060 |  |
Securities HTM, Allowance for Credit (Losses) | (263) | (263) | $ (203) | $ (203)
Securities HTM, Gross Unrealized Gains | 19,552 | 27,957 |  |
Securities HTM, Gross Unrealized (Losses) | (102,479) | (63,171) |  |
Securities HTM, Fair Value | 791,104 | 800,583 |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 317,770 | 331,337 |  |
Securities AFS, Gross Unrealized Gains | 143 | 185 |  |
Securities AFS, Gross Unrealized (Losses) | (53,672) | (50,413) |  |
Securities AFS, Fair Value | 264,241 | 281,109 |  |
U.S. treasuries and govt. sponsored agency securities |  |  |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 19,641 | 23,113 |  |
Securities AFS, Gross Unrealized Gains | 7 | 7 |  |
Securities AFS, Gross Unrealized (Losses) | (2,161) | (2,529) |  |
Securities AFS, Fair Value | 17,487 | 20,591 |  |
Residential mortgage-backed and related securities |  |  |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 47,841 | 55,641 |  |
Securities AFS, Gross Unrealized Gains | 3 | 3 |  |
Securities AFS, Gross Unrealized (Losses) | (4,650) | (5,602) |  |
Securities AFS, Fair Value | 43,194 | 50,042 |  |
Municipal securities |  |  |  |
Securities HTM: |  |  |  |
Securities HTM, Amortized cost | 845,226 | 806,992 |  |
Securities HTM, Allowance for Credit (Losses) | (254) | (254) | (202) | (202)
Securities HTM, Gross Unrealized Gains | 15,157 | 23,292 |  |
Securities HTM, Gross Unrealized (Losses) | (102,476) | (63,164) |  |
Securities HTM, Fair Value | 757,653 | 766,866 |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 203,776 | 204,664 |  |
Securities AFS, Gross Unrealized (Losses) | (45,017) | (40,089) |  |
Securities AFS, Fair Value | 158,759 | 164,575 |  |
Asset-backed securities |  |  |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 7,644 | 9,053 |  |
Securities AFS, Gross Unrealized Gains | 121 | 171 |  |
Securities AFS, Gross Unrealized (Losses) | (1) |  |  |
Securities AFS, Fair Value | 7,764 | 9,224 |  |
Corporate securities |  |  |  |
Securities HTM: |  |  |  |
Securities HTM, Amortized cost | 28,018 | 28,018 |  |
Securities HTM, Allowance for Credit (Losses) | (8) | (8) | $ (1) | (1)
Securities HTM, Gross Unrealized Gains | 4,395 | 4,665 |  |
Securities HTM, Fair Value | 32,405 | 32,675 |  |
Securities AFS: |  |  |  |
Securities AFS, Amortized Cost | 38,868 | 38,866 |  |
Securities AFS, Allowance for Credit (Losses) |  |  |  | $ (989)
Securities AFS, Gross Unrealized Gains | 12 | 4 |  |
Securities AFS, Gross Unrealized (Losses) | (1,843) | (2,193) |  |
Securities AFS, Fair Value | 37,037 | 36,677 |  |
Other securities |  |  |  |
Securities HTM: |  |  |  |
Securities HTM, Amortized cost | 1,050 | 1,050 |  |
Securities HTM, Allowance for Credit (Losses) | (1) | (1) |  |
Securities HTM, Gross Unrealized (Losses) | (3) | (7) |  |
Securities HTM, Fair Value | $ 1,046 | $ 1,042 |  |

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