INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) position	Jun. 30, 2016 USD ($)	Jun. 30, 2017 position
Investment [Line Items]
Percentage of debt securities considered to be of investment-grade	98.00%		98.00%
Maximum percentage of any general obligation bonds in one state			8.00%
Percentage of tax exempt securities	2.00%		2.00%
Securities in unrealized loss positions, number of positions	730		730
Number of positions	2,260		2,260
Other-than-temporary impairments | $	$ 0	$ 0