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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities sold under repurchase agreements (Details) - Securities sold under repurchase agreements - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Repurchase agreements, ending balance $ 1,668 $ 5,535
Repurchase agreements, average balance during period 2,517 3,770
Book value of collateral 4,737 5,507
Market value of collateral $ 4,725 $ 5,540
Weighted average rate during period 0.20% 0.16%
Weighted average maturity 1 day 1 day