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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 7,373 |
Due after five years through ten years | 21,924 |
Due after ten years | 7,698 |
Amortized Cost | 251,428 | $ 235,849
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 7,216 |
Due after five years through ten years | 21,469 |
Due after ten years | 7,410 |
Available-for-sale debt securities, estimated fair value | 243,490 | 232,372
Amortized Cost |  |
Due within one year | 1,175 |
Due after one year through five years | 19,089 |
Due after five years through ten years | 40,520 |
Due after ten years | 82,511 |
Amortized Cost | 167,239 | 174,684
Estimated Fair Value |  |
Due within one year | 1,175 |
Due after one year through five years | 19,295 |
Due after five years through ten years | 41,178 |
Due after ten years | 81,207 |
Held-to-maturity securities, estimated fair value | 166,441 | 176,790
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 95,062 |
Amortized Cost | 95,062 | 92,471
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 91,242 |
Available-for-sale debt securities, estimated fair value | 91,242 | 90,678
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 18,880 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 18,496 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 119,371 |
Amortized Cost | 119,371 | 116,809
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 116,153 |
Available-for-sale debt securities, estimated fair value | 116,153 | $ 115,311
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 5,064 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | $ 5,090 |

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