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INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Due in one year or less | $ 0 |
Due after one year through five years | 82,995 |
Due after five years through ten years | 186,981 |
Due after ten years | 634,012 |
Amortized cost, total | 903,988 |
Available-for-sale, Fair Value |  |
Due in one year or less | 0 |
Due after one year through five years | 83,568 |
Due after five years through ten years | 189,976 |
Due after ten years | 639,979 |
Fair value, total | 913,523 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Due in one year or less | 0 |
Due after one year through five years | 0 |
Due after five years through ten years | 1,303 |
Due after ten years | 0 |
Amortized Cost | 1,303 | $ 1,307
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Due in one year or less | 0 |
Due after one year through five years | 0 |
Due after five years through ten years | 1,352 |
Due after ten years | 0 |
Debt Securities, Held-to-maturity, Fair Value | $ 1,352 | $ 1,291

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