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RECENT ACCOUNTING PRONOUNCEMENTS NEW ACCOUNTING PRONOUNCEMENTS (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Available-for-sale Securities | $ 797,251 | $ 779,867
Available-for-sale Securities, Amortized Cost Basis | 805,198 | 789,229
Equity Securities [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Available-for-sale Securities | 741 | 741
Available-for-sale Securities, Amortized Cost Basis | $ 623 | $ 632

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