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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 6,235 |
Due after one year through five years | 51,011 |
Due after five years through ten years | 51,214 |
Due after ten years | 80,987 |
Available-for-sale debt securities, amortized cost basis | 359,126 | $ 210,212
Estimated Fair Value |  |
Due within one year | 6,280 |
Due after one year through five years | 53,759 |
Due after five years through ten years | 54,905 |
Due after ten years | 86,187 |
Available-for-sale debt securities, estimated fair value | 376,381 | 212,716
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 89,123 |
Available-for-sale debt securities, amortized cost basis | 89,123 | 83,967
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 91,821 |
Available-for-sale debt securities, estimated fair value | 91,821 | 84,182
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale debt securities, amortized cost basis | 80,556 |
Available-for-sale debt securities, amortized cost basis | 80,556 | 89,798
Estimated Fair Value |  |
Available-for-sale debt securities, estimated fair value | 83,429 |
Available-for-sale debt securities, estimated fair value | $ 83,429 | $ 90,927

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