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OTHER COMPREHENSIVE (LOSS) INCOME - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - Reclassification Out Of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ (9)	$ (5,288)	$ (136)	$ (11,749)
Reclassification from AOCI, Current Period, Tax	0	0	0	0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(9)	(5,288)	(136)	(11,749)
Realized gain on sale of debt securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0	(5,288)	0	(13,380)
Provision for credit losses (benefit) expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	$ (9)	$ 0	$ (136)	$ 1,631

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Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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