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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 10,462 |
Due after one year through five years | 12,032 |
Due after five years through ten years | 22,616 |
Due after ten years | 0 |
Available-for-sale debt securities, amortized cost basis | 288,167 | $ 215,380
Estimated Fair Value |  |
Due within one year | 10,426 |
Due after one year through five years | 11,951 |
Due after five years through ten years | 21,031 |
Due after ten years | 0 |
Available-for-sale debt securities, estimated fair value | 277,567 | 196,195
Held to Maturity Amortized Cost |  |
Due within one year | 34,512 |
Due after one year through five years | 41,115 |
Due after five years through ten years | 89,580 |
Due after ten years | 30,477 |
Held to Maturity debt securities, amortized cost | 341,911 | 404,208
Held to Maturity Estimated Fair Value |  |
Due within one year | 34,241 |
Due after one year through five years | 39,991 |
Due after five years through ten years | 87,178 |
Due after ten years | 28,315 |
Held to maturity debt securities, estimated fair value | 319,313 | 374,523
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 227,136 |
Available-for-sale debt securities, amortized cost basis | 227,136 | 164,419
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 219,434 |
Available-for-sale debt securities, estimated fair value | 219,434 | 149,812
Held to Maturity Amortized Cost |  |
Held to Maturity debt securities, amortized cost | 111,767 |
Held to Maturity debt securities, amortized cost | 111,767 | 119,872
Held to Maturity Estimated Fair Value |  |
Held to maturity debt securities, estimated fair value | 100,822 |
Held to maturity debt securities, estimated fair value | 100,822 | 104,767
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 15,921 |
Available-for-sale debt securities, amortized cost basis | 15,921 | 18,757
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 14,725 |
Available-for-sale debt securities, estimated fair value | 14,725 | 17,074
Held to Maturity Amortized Cost |  |
Held to Maturity debt securities, amortized cost | 34,460 |
Held to Maturity debt securities, amortized cost | 34,460 | 37,437
Held to Maturity Estimated Fair Value |  |
Held to maturity debt securities, estimated fair value | 28,766 |
Held to maturity debt securities, estimated fair value | $ 28,766 | $ 30,161

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