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ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Advances from Federal Home Loan Banks [Abstract]    
Federal Home Loan Bank Advances Maturities Due Thirty To Ninety Days $ 70,000  
Federal Home Loan Bank Advances Maturities Due One To Three Years 420,000  
Federal Home Loan Bank Advances Maturities Due Three To Four Years 200,000  
Total Federal Home Loan Bank Advances $ 690,000 $ 715,000