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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, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]          
Gross realized gains on sales and calls of securities available-for-sale $ 0   $ 278 $ 208 $ 5,519
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 0 $ 208 278 208 5,519
Proceeds from sales and calls of securities available-for-sale $ 298,156   $ 325,439 $ 820,048 $ 612,956