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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Summary of Advances from FHLB (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]    
Long-term Federal Home Loan Bank Advances $ 690,000 $ 715,000
Federal Home Loan Bank, Advance, Branch of FHLB Bank, Interest Rate, Type [Fixed List] Fixed Fixed