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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Net realized gains (losses) on sales and calls of securities available-for-sale $ 12,824 $ 0 $ 29,613 $ (2)
Proceeds from sales and calls of securities available-for-sale 1,304,032 0 3,551,453 174
Tax expense (benefit) on sales and calls of securities available-for-sale 5,231 0 12,011 (1)
Debt Securities        
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains on sales and calls of securities available-for-sale 12,825 0 29,618 0
Gross realized losses on sales and calls of securities available-for-sale 0 0 (5) (2)
Net realized gains (losses) on sales and calls of securities available-for-sale $ 12,825 $ 0 $ 29,613 $ (2)