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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
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Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |
Average balance during the year | $ 12,796 | $ 12,769
Average interest rate during the year | 0.57% | 0.53%
Maximum month-end balance during the year | $ 14,365 | $ 14,539
Weighted average interest rate at year-end | 0.44% | 0.38%

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