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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 1,094 |
Due after five years through ten years | 17,767 |
Due after ten years | 7,793 |
Available-for-sale debt securities, amortized cost basis | 246,830 |
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 1,104 |
Due after five years through ten years | 17,929 |
Due after ten years | 7,493 |
Available-for-sale debt securities, estimated fair value | 246,233 |
Amortized Cost |  |
Due within one year | 2,831 |
Due after one year through five years | 5,553 |
Due after five years through ten years | 40,659 |
Due after ten years | 98,978 |
Amortized Cost | 182,248 | $ 189,371
Estimated Fair Value |  |
Due within one year | 2,838 |
Due after one year through five years | 5,731 |
Due after five years through ten years | 42,175 |
Due after ten years | 99,616 |
Held-to-maturity securities, estimated fair value | 184,527 | $ 186,155
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 95,343 |
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 94,465 |
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 24,642 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 24,869 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 124,833 |
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 125,242 |
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 9,585 |
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | $ 9,298 |

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