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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, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due in one year or less | $ 76,191 |
Due from one year to five years | 732,862 |
Due from five to ten years | 23,108 |
Due after ten years | 22,758 |
Mortgage-backed securities | 686,223 |
Amortized Cost | 1,541,142 | $ 1,559,005
Estimated Fair Value |  |
Due in one year or less | 75,649 |
Due from one year to five years | 722,272 |
Due from five to ten years | 22,363 |
Due after ten years | 20,997 |
Mortgage-backed securities | 655,555 |
Estimated Fair Value | 1,496,836 | 1,500,060
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 | 31,905 |
Mortgage-backed securities | 102,270 |
Amortized Cost | 134,175 | 134,864
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 | 27,330 |
Mortgage-backed securities | 88,763 |
Estimated Fair Value | $ 116,093 | $ 114,538

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