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Note 3 - Investment Securities - Amortized Cost and Fair Value of HTM and AFS Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Securities HTM: |  |  |
Securities held to maturity, at amortized cost, net of allowance for credit losses | $ 683,504 | $ 587,142 |
Securities HTM, Amortized cost | 683,707 | 587,322 |
Securities HTM, Allowance for Credit (Losses) | (203) | (180) |
Securities HTM, Gross Unrealized Gains | 33,429 | 5,292 |
Securities HTM, Gross Unrealized (Losses) | (36,654) | (56,798) |
Securities HTM, Fair Value | 680,279 | 535,636 |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 348,633 | 400,511 |
Securities AFS, Allowance for Credit (Losses) | (989) |  |
Securities AFS, Gross Unrealized Gains | 190 | 160 |
Securities AFS, Gross Unrealized (Losses) | (48,179) | (59,711) |
Securities AFS, Fair Value | 299,655 | 340,960 |
U.S. treasuries and govt. sponsored agency securities |  |  |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 17,399 | 19,745 |
Securities AFS, Gross Unrealized Gains | 12 | 19 |
Securities AFS, Gross Unrealized (Losses) | (2,438) | (2,783) |
Securities AFS, Fair Value | 14,973 | 16,981 |
Residential mortgage-backed and related securities |  |  |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 65,168 | 73,438 |
Securities AFS, Gross Unrealized (Losses) | (5,972) | (7,223) |
Securities AFS, Fair Value | 59,196 | 66,215 |
Municipal securities. |  |  |
Securities HTM: |  |  |
Securities HTM, Amortized cost | 682,657 | 586,272 |
Securities HTM, Allowance for Credit (Losses) | (202) | (180) | $ (198)
Securities HTM, Gross Unrealized Gains | 33,385 | 5,292 |
Securities HTM, Gross Unrealized (Losses) | (36,639) | (56,798) |
Securities HTM, Fair Value | 679,201 | 534,586 |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 206,566 | 239,812 |
Securities AFS, Gross Unrealized Gains | 11 | 66 |
Securities AFS, Gross Unrealized (Losses) | (35,590) | (46,700) |
Securities AFS, Fair Value | 170,987 | 193,178 |
Asset-backed securities |  |  |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 15,261 | 18,885 |
Securities AFS, Gross Unrealized Gains | 167 | 48 |
Securities AFS, Gross Unrealized (Losses) | (5) | (205) |
Securities AFS, Fair Value | 15,423 | 18,728 |
Corporate Debt Securities [Member] |  |  |
Securities AFS: |  |  |
Securities AFS, Allowance for Credit (Losses) | (989) |  |
Other securities |  |  |
Securities HTM: |  |  |
Securities HTM, Amortized cost | 1,050 | 1,050 |
Securities HTM, Allowance for Credit (Losses) | (1) |  |
Securities HTM, Gross Unrealized Gains | 44 |  |
Securities HTM, Gross Unrealized (Losses) | (15) |  |
Securities HTM, Fair Value | 1,078 | 1,050 |
Securities AFS: |  |  |
Securities AFS, Amortized Cost | 44,239 | 48,631 |
Securities AFS, Allowance for Credit (Losses) | (989) |  |
Securities AFS, Gross Unrealized Gains |  | 27 |
Securities AFS, Gross Unrealized (Losses) | (4,174) | (2,800) |
Securities AFS, Fair Value | $ 39,076 | $ 45,858 |

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