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INVESTMENT SECURITIES - Proceeds from Sales and Calls of Securities and Associated Gross Gains and Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains on sales and calls of securities available-for-sale $ 13 $ 7,625 $ 5,532 $ 12,080
Gross realized losses on sales and calls of securities available-for-sale 0 0 0 0
Net realized gains on sales and calls of securities available-for-sale 13 7,625 5,532 12,080
Proceeds from sales and calls of securities available-for-sale $ 283,114 $ 312,961 $ 896,070 $ 1,199,551