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INVESTMENTS (Schedule of Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Due in one year or less | $ 4,439 |
Due after one year through five years | 64,370 |
Due after five years through ten years | 225,186 |
Due after ten years | 716,330 |
Amortized cost, total | 1,010,325 |
Available-for-sale, Fair Value |  |
Due in one year or less | 4,487 |
Due after one year through five years | 66,655 |
Due after five years through ten years | 238,559 |
Due after ten years | 737,962 |
Fair value, total | 1,047,663 |
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 | 511 |
Due after five years through ten years | 788 |
Due after ten years | 0 |
Amortized Cost | 1,299 | $ 1,302
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 | 542 |
Due after five years through ten years | 846 |
Due after ten years | 0 |
Debt Securities, Held-to-maturity, Fair Value | $ 1,388 | $ 1,359

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