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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - Gain (loss) on securities available-for-sale - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ (18,091)	$ (11,542)	$ (24,117)	$ 5,227
Unrealized gain (loss) arising during the period	7,678	(10,796)	16,422	(30,478)
Reclassification adjustment from other comprehensive income	0	(278)	(208)	(5,519)
Tax effect of current period changes	(2,255)	3,246	(4,765)	10,904
Total changes, net of taxes	5,423	(7,828)	11,449	(25,093)
Reclassification of stranded tax effects to retained earnings	0	0	0	496
Balance at end of period	$ (12,668)	$ (19,370)	$ (12,668)	$ (19,370)

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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