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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 14,633 |
Due after five years through ten years | 30,460 |
Due after ten years | 0 |
Available-for-sale debt securities, amortized cost basis | 341,628 | $ 363,097
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 15,223 |
Due after five years through ten years | 30,683 |
Due after ten years | 0 |
Available-for-sale debt securities, estimated fair value | 342,206 | 380,795
Held to Maturity Amortized Cost |  |
Due within one year | 13,471 |
Due after one year through five years | 57,858 |
Due after five years through ten years | 44,342 |
Due after ten years | 65,639 |
Held to Maturity debt securities, amortized cost | 184,263 | 0
Held to Maturity Estimated Fair Value |  |
Due within one year | 13,578 |
Due after one year through five years | 60,065 |
Due after five years through ten years | 46,491 |
Due after ten years | 69,422 |
Held to maturity debt securities, estimated fair value | 192,472 |
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 221,610 |
Available-for-sale debt securities, amortized cost basis | 221,610 | 104,210
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 221,308 |
Available-for-sale debt securities, estimated fair value | 221,308 | 107,164
Held to Maturity Amortized Cost |  |
Held to Maturity debt securities, amortized cost | 2,953 |
Held to Maturity debt securities, amortized cost | 2,953 |
Held to Maturity Estimated Fair Value |  |
Held to maturity debt securities, estimated fair value | 2,916 |
Held to maturity debt securities, estimated fair value | 2,916 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 74,925 |
Available-for-sale debt securities, amortized cost basis | 74,925 | 64,611
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 74,992 |
Available-for-sale debt securities, estimated fair value | 74,992 | $ 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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