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SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Total | $ 492,272 | $ 199,639
Held to maturity securities, fair value | 499,501 | 203,483
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Total | 492,272 | 199,639
Gross Unrealized Gains | 7,375 | 4,014
Gross Unrealized Losses | (146) | (170)
Held to maturity securities, fair value | $ 499,501 | $ 203,483

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