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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Net realized gains on sales and calls of securities available-for-sale $ 7,625 $ 487 $ 12,080 $ 30,100
Proceeds from sales and calls of securities available-for-sale 312,961 232,512 1,199,551 3,783,965
Tax expense on sales and calls of securities available-for-sale 3,171 202 5,024 12,507
Debt Securities        
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains on sales and calls of securities available-for-sale 7,625 487 12,080 30,105
Gross realized losses on sales and calls of securities available-for-sale 0 0 0 (5)
Net realized gains on sales and calls of securities available-for-sale $ 7,625 $ 487 $ 12,080 $ 30,100