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INVESTMENT SECURITIES - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Amortized cost |  |  |  |  |
Within one year | $ 1,032 |  | $ 1,032 |  |
After one year through five years | 67,779 |  | 67,779 |  |
After five years through ten years | 123,284 |  | 123,284 |  |
After ten years | 111,372 |  | 111,372 |  |
Mortgage-backed securities | 984,293 |  | 984,293 |  |
Total available for sale securities | 1,287,760 |  | 1,287,760 |  | $ 1,012,592
Fair value |  |  |  |  |
Within one year | 1,031 |  | 1,031 |  |
After one year through five years | 64,894 |  | 64,894 |  |
After five years through ten years | 114,690 |  | 114,690 |  |
After ten years | 110,785 |  | 110,785 |  |
Mortgage-backed securities | 920,690 |  | 920,690 |  |
Total available for sale securities | 1,212,090 |  | 1,212,090 |  | $ 915,895
Proceeds from sales | 13,049 | $ 65,911 | 58,874 | $ 165,871 |
Gross realized gains on sales | 113 | 0 | 420 | 338 |
Gross realized losses on sales | $ (157) | $ (4,961) | $ (616) | $ (6,816) |

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