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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) - Securities sold under agreement to repurchase - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Securities sold under agreements to repurchase |  |
Average daily balance during the year | $ 867 | $ 45,630
Average interest rate during the year (as a percent) | 0.05% | 0.85%
Maximum month-end balance during the year | $ 1,300 | $ 51,197
Weighted average interest rate at year-end (as a percent) | 0.05% | 0.83%

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