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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]        
Net realized gains on sales and calls of securities available-for-sale $ 1,099 $ 12,824 $ 4,455 $ 29,613
Proceeds from sales and calls of securities available-for-sale 475,586 1,304,032 886,590 3,551,453
Tax expense on sales and calls of securities available-for-sale 457 5,231 1,853 12,011
Debt Securities        
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains on sales and calls of securities available-for-sale 1,099 12,825 4,455 29,618
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 $ 1,099 $ 12,825 $ 4,455 $ 29,613