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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Summary of Securities (Details) - Securities Sold under Agreements to Repurchase - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Average balance during the year $ 12,769 $ 12,475
Average interest rate during the year 0.53% 0.53%
Maximum month-end balance during the year $ 14,539 $ 14,817
Weighted average interest rate at year-end 0.38% 0.41%