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INVESTMENT SECURITIES - Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 306,980 |
Due from one year to five years | 440,409 |
Due from five to ten years | 73,709 |
Due after ten years | 12,153 |
Mortgage-backed securities | 631,284 |
Amortized Cost | 1,464,535 | $ 1,447,637
Estimated Fair Value |  |
Due in one year or less | 305,330 |
Due from one year to five years | 429,292 |
Due from five to ten years | 72,350 |
Due after ten years | 10,751 |
Mortgage-backed securities | 596,696 |
Estimated Fair Value | 1,414,419 | 1,402,944
Amortized Cost |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five to ten years | 0 |
Due after ten years | 33,668 |
Mortgage-backed securities | 113,354 |
Amortized Cost | 147,022 | 141,512
Estimated Fair Value |  |
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five to ten years | 0 |
Due after ten years | 27,977 |
Mortgage-backed securities | 98,604 |
Estimated Fair Value | $ 126,581 | $ 122,731

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