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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Amortized Cost |  |  |
Due within one year | $ 0 |  |
Due after one year through five years | 14,645 |  |
Due after five years through ten years | 29,473 |  |
Due after ten years | 0 |  |
Available-for-sale debt securities, amortized cost basis | 265,236 | $ 265,236 | $ 363,097
Estimated Fair Value |  |  |
Due within one year | 0 |  |
Due after one year through five years | 15,430 |  |
Due after five years through ten years | 29,875 |  |
Due after ten years | 0 |  |
Available-for-sale debt securities, estimated fair value | 269,070 |  | 380,795
Held to Maturity Amortized Cost |  |  |
Due within one year | 4,802 |  |
Due after one year through five years | 48,612 |  |
Due after five years through ten years | 50,369 |  |
Due after ten years | 66,851 |  |
Held to Maturity debt securities, amortized cost | 173,676 |  | 0
Held to Maturity Estimated Fair Value |  |  |
Due within one year | 4,868 |  |
Due after one year through five years | 50,466 |  |
Due after five years through ten years | 53,350 |  |
Due after ten years | 70,942 |  |
Held to maturity debt securities, estimated fair value | 182,631 |  |
Mortgage-backed securities |  |  |
Amortized Cost |  |  |
Available-for-sale debt securities, amortized cost basis | 157,846 |  |
Available-for-sale debt securities, amortized cost basis | 157,846 |  | 104,210
Estimated Fair Value |  |  |
Available-for-sale debt securities, estimated fair value | 159,142 |  |
Available-for-sale debt securities, estimated fair value | 159,142 |  | 107,164
Held to Maturity Amortized Cost |  |  |
Held to Maturity debt securities, amortized cost | 3,042 |  |
Held to Maturity debt securities, amortized cost | 3,042 |  |
Held to Maturity Estimated Fair Value |  |  |
Held to maturity debt securities, estimated fair value | 3,005 |  |
Held to maturity debt securities, estimated fair value | 3,005 |  |
Collateralized mortgage obligations |  |  |
Amortized Cost |  |  |
Available-for-sale debt securities, amortized cost basis | 63,272 |  |
Available-for-sale debt securities, amortized cost basis | 63,272 |  | 64,611
Estimated Fair Value |  |  |
Available-for-sale debt securities, estimated fair value | 64,623 |  |
Available-for-sale debt securities, estimated fair value | 64,623 |  | $ 66,945
Held to Maturity Amortized Cost |  |  |
Held to Maturity debt securities, amortized cost | 0 |  |
Held to Maturity Estimated Fair Value |  |  |
Held to maturity debt securities, estimated fair value | $ 0 |  |

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