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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,015 |
Due after one year through five years | 13,407 |
Due after five years through ten years | 13,324 |
Due after ten years | 8,701 |
Available-for-sale debt securities, amortized cost basis | 210,212 | $ 239,945
Estimated Fair Value |  |
Due within one year | 1,019 |
Due after one year through five years | 13,772 |
Due after five years through ten years | 13,924 |
Due after ten years | 8,892 |
Available-for-sale debt securities, estimated fair value | 212,716 | 232,975
Amortized Cost |  |
Due within one year | 2,189 |
Due after one year through five years | 30,221 |
Due after five years through ten years | 32,771 |
Due after ten years | 73,235 |
Amortized Cost | 155,458 | 163,164
Estimated Fair Value |  |
Due within one year | 2,200 |
Due after one year through five years | 31,179 |
Due after five years through ten years | 34,078 |
Due after ten years | 75,666 |
Held-to-maturity securities, estimated fair value | 160,460 | 162,800
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 83,967 |
Available-for-sale debt securities, amortized cost basis | 83,967 | 93,083
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 84,182 |
Available-for-sale debt securities, estimated fair value | 84,182 | 89,459
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 14,365 |
Amortized Cost | 14,365 | 17,163
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 14,550 |
Held-to-maturity securities, estimated fair value | 14,550 | 16,717
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 89,798 |
Available-for-sale debt securities, amortized cost basis | 89,798 | 111,341
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 90,927 |
Available-for-sale debt securities, estimated fair value | 90,927 | 108,969
Amortized Cost |  |
Held-to-maturity securities, without single maturity date | 2,677 |
Amortized Cost | 2,677 | 4,059
Estimated Fair Value |  |
Held-to-maturity securities, without single maturity date | 2,787 |
Held-to-maturity securities, estimated fair value | $ 2,787 | $ 4,079

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