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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 6,158 |
Due after five years through ten years | 12,665 |
Due after ten years | 7,746 |
Available-for-sale debt securities, amortized cost basis | 235,849 |
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 6,129 |
Due after five years through ten years | 12,708 |
Due after ten years | 7,546 |
Available-for-sale debt securities, estimated fair value | 232,372 |
Amortized Cost |  |
Due within one year | 2,663 |
Due after one year through five years | 5,769 |
Due after five years through ten years | 42,711 |
Due after ten years | 95,353 |
Amortized Cost | 174,684 | $ 189,371
Estimated Fair Value |  |
Due within one year | 2,665 |
Due after one year through five years | 5,849 |
Due after five years through ten years | 43,903 |
Due after ten years | 96,105 |
Held-to-maturity securities, estimated fair value | 176,790 | $ 186,155
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 92,471 |
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 90,678 |
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 22,026 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 21,995 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 116,809 |
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 115,311 |
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 6,162 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | $ 6,273 |

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