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MARKETABLE SECURITIES - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 2,005 |
Due after one year through five years | 7,544 |
Due after five years through ten years | 22,675 |
Due after ten years | 0 |
Available-for-sale debt securities, amortized cost basis | 203,373 | $ 208,165
Estimated Fair Value |  |
Due within one year | 1,967 |
Due after one year through five years | 7,145 |
Due after five years through ten years | 19,801 |
Due after ten years | 0 |
Available-for-sale debt securities, estimated fair value | 178,644 | 188,927
Held to Maturity Amortized Cost |  |
Due within one year | 46,996 |
Due after one year through five years | 68,569 |
Due after five years through ten years | 80,411 |
Due after ten years | 51,577 |
Held to Maturity debt securities, amortized cost | 408,308 | 509,008
Held to Maturity Estimated Fair Value |  |
Due within one year | 46,316 |
Due after one year through five years | 65,029 |
Due after five years through ten years | 76,728 |
Due after ten years | 46,934 |
Held to maturity debt securities, estimated fair value | 367,691 | 475,068
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 151,424 |
Available-for-sale debt securities, amortized cost basis | 151,424 | 145,896
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 132,141 |
Available-for-sale debt securities, estimated fair value | 132,141 | 130,341
Held to Maturity Amortized Cost |  |
Held to Maturity debt securities, amortized cost | 122,231 |
Held to Maturity debt securities, amortized cost | 122,231 | 132,693
Held to Maturity Estimated Fair Value |  |
Held to maturity debt securities, estimated fair value | 102,600 |
Held to maturity debt securities, estimated fair value | 102,600 | 117,985
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 19,725 |
Available-for-sale debt securities, amortized cost basis | 19,725 | 21,981
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 17,590 |
Available-for-sale debt securities, estimated fair value | 17,590 | 20,157
Held to Maturity Amortized Cost |  |
Held to Maturity debt securities, amortized cost | 38,524 |
Held to Maturity debt securities, amortized cost | 38,524 | 41,759
Held to Maturity Estimated Fair Value |  |
Held to maturity debt securities, estimated fair value | 30,084 |
Held to maturity debt securities, estimated fair value | $ 30,084 | $ 34,334

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