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INVESTMENT SECURITIES - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Amortized cost |  |  |  |  |
Within one year | $ 4,350 |  | $ 4,350 |  |
After one year through five years | 37,879 |  | 37,879 |  |
After five years through ten years | 89,806 |  | 89,806 |  |
After ten years | 112,615 |  | 112,615 |  |
Mortgage-backed securities | 1,218,106 |  | 1,218,106 |  |
Total available for sale securities | 1,462,756 |  | 1,462,756 |  | $ 1,314,790
Fair value |  |  |  |  |
Within one year | 4,317 |  | 4,317 |  |
After one year through five years | 35,951 |  | 35,951 |  |
After five years through ten years | 84,325 |  | 84,325 |  |
After ten years | 111,651 |  | 111,651 |  |
Mortgage-backed securities | 1,142,663 |  | 1,142,663 |  |
Fair value | 1,378,907 |  | 1,378,907 |  | $ 1,207,574
Proceeds from sales | 103,759 | $ 13,049 | 103,759 | $ 58,874 |
Gross realized gains on sales | 587 | 113 | 587 | 420 |
Gross realized losses on sales | $ (573) | $ (157) | $ (573) | $ (616) |

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