FAIR VALUES OF FINANCIAL INSTRUMENTS - Gains and (Losses) on Non-Recurring Assets (Detail) - Nonrecurring - Impaired loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Single family residential mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses recognized on assets measured at fair value	$ 0	$ 0	$ (531)	$ (490)
Commercial and industrial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses recognized on assets measured at fair value	(6,090)	0	(8,514)	0
SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses recognized on assets measured at fair value	(670)	0	(1,544)	(46)
Other consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses recognized on assets measured at fair value	$ 0	$ 0	$ (4)	$ (88)