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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,030 |
Due after one year through five years | 11,060 |
Due after five years through ten years | 15,717 |
Due after ten years | 7,604 |
Available-for-sale debt securities, amortized cost basis | 227,200 | $ 239,945
Estimated Fair Value |  |
Due within one year | 1,035 |
Due after one year through five years | 11,222 |
Due after five years through ten years | 16,262 |
Due after ten years | 7,705 |
Available-for-sale debt securities, estimated fair value | 228,714 | 232,975
Amortized Cost |  |
Due within one year | 984 |
Due after one year through five years | 28,359 |
Due after five years through ten years | 34,497 |
Due after ten years | 76,000 |
Amortized Cost | 158,915 | 163,164
Estimated Fair Value |  |
Due within one year | 990 |
Due after one year through five years | 29,166 |
Due after five years through ten years | 35,860 |
Due after ten years | 77,801 |
Held-to-maturity securities, estimated fair value | 162,972 | 162,800
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 91,782 |
Available-for-sale debt securities, amortized cost basis | 91,782 | 93,083
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 91,279 |
Available-for-sale debt securities, estimated fair value | 91,279 | 89,459
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 15,832 |
Amortized Cost | 15,832 | 17,163
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 15,808 |
Held-to-maturity securities, estimated fair value | 15,808 | 16,717
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 100,007 |
Available-for-sale debt securities, amortized cost basis | 100,007 | 111,341
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 101,211 |
Available-for-sale debt securities, estimated fair value | 101,211 | 108,969
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 3,243 |
Amortized Cost | 3,243 | 4,059
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 3,347 |
Held-to-maturity securities, estimated fair value | $ 3,347 | $ 4,079

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