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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 11,216 |
Due after five years through ten years | 16,654 |
Due after ten years | 7,651 |
Available-for-sale debt securities, amortized cost basis | 239,945 | $ 235,849
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 10,852 |
Due after five years through ten years | 16,287 |
Due after ten years | 7,408 |
Available-for-sale debt securities, estimated fair value | 232,975 | 232,372
Amortized Cost |  |
Due within one year | 764 |
Due after one year through five years | 19,062 |
Due after five years through ten years | 43,059 |
Due after ten years | 79,057 |
Amortized Cost | 163,164 | 174,684
Estimated Fair Value |  |
Due within one year | 764 |
Due after one year through five years | 19,286 |
Due after five years through ten years | 43,795 |
Due after ten years | 78,159 |
Held-to-maturity securities, estimated fair value | 162,800 | 176,790
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 93,083 |
Available-for-sale debt securities, amortized cost basis | 93,083 | 92,471
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 89,459 |
Available-for-sale debt securities, estimated fair value | 89,459 | 90,678
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 17,163 |
Amortized Cost | 17,163 | 22,026
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 16,717 |
Held-to-maturity securities, estimated fair value | 16,717 | 21,995
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 111,341 |
Available-for-sale debt securities, amortized cost basis | 111,341 | 116,809
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 108,969 |
Available-for-sale debt securities, estimated fair value | 108,969 | 115,311
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 4,059 |
Amortized Cost | 4,059 | 6,162
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 4,079 |
Held-to-maturity securities, estimated fair value | $ 4,079 | $ 6,273

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