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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Additional Information (Detail) - Federal Home Loan Bank Advances [Member]
$ in Millions
Sep. 30, 2018
USD ($)
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]  
Additional capacity on credit facility based on collateral pledged $ 503.6
Letters of credit issued by the FHLB as pledges for public deposits in the Virgin Islands $ 167.0