Annual report pursuant to Section 13 and 15(d)

SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details)

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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, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Total $ 199,639 $ 201,526
Held to maturity securities, fair value 203,483 202,315
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Total 199,639 201,526
Gross Unrealized Gains 4,014 1,617
Gross Unrealized Losses (170) (828)
Held to maturity securities, fair value $ 203,483 $ 202,315