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RELATED-PARTY TRANSACTIONS - Related Party Transactions (Details) - Officers and Directors - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Loans to certain officers and directors and their related interests $ 0 $ 249,000
Deposits from principal officers, directors, and their related interests $ 11,400,000 $ 2,200,000