ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Advances from FHLB Mature (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Federal Home Loan Bank Advances	$ 670,000	$ 455,000
One to thirty days
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Federal Home Loan Bank Advances	170,000
One to three years
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Federal Home Loan Bank Advances	300,000
Six months to one year [Member]
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Federal Home Loan Bank Advances	200,000
One to six months
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Federal Home Loan Bank Advances	$ 0