INVESTMENT SECURITIES - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) position	Mar. 31, 2016 USD ($)	Dec. 31, 2016 position
Investment [Line Items]
Percentage of debt securities considered to be of investment-grade	98.00%
Maximum percentage of any general obligation bonds in one state	9.00%
Percentage of tax exempt securities	2.00%
Securities in unrealized loss positions, number of positions	970
Number of positions			2,220
Other-than-temporary impairments | $	$ 0	$ 0