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, 2018
Dec. 31, 2017
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