STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,683	$ 456	$ (2,995)	$ 509
Unrealized gain arising during the period	7,979	3,697	47,353	3,607
Reclassification adjustment from other comprehensive income	(487)	(1,750)	(30,100)	(1,748)
Tax effect of current period changes	(3,110)	(818)	(7,193)	(783)
Total changes, net of taxes	4,382	1,129	10,060	1,076
Balance at end of period	7,065	1,585	7,065	1,585
Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	0	96	0	(136)
Unrealized gain arising during the period	0	(1,084)	0	(683)
Reclassification adjustment from other comprehensive income	0	918	0	918
Tax effect of current period changes	0	70	0	(99)
Total changes, net of taxes	0	(96)	0	136
Balance at end of period	0	0	0	0
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	2,683	552	(2,995)	373
Unrealized gain arising during the period	7,979	2,613	47,353	2,924
Reclassification adjustment from other comprehensive income	(487)	(832)	(30,100)	(830)
Tax effect of current period changes	(3,110)	(748)	(7,193)	(882)
Total changes, net of taxes	4,382	1,033	10,060	1,212
Balance at end of period	$ 7,065	$ 1,585	$ 7,065	$ 1,585