INVESTMENT SECURITIES - ACL for Debt Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 1,310
Addtions for securities for which previous expected credit losses were recognized (provision for credit losses)	(136)
Net charge-offs	(69)
Ending Balance	1,105	$ 1,310
Private label [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	1,002	0
Addtions for securities for which previous expected credit losses were recognized (provision for credit losses)		1,641
Net charge-offs		(331)
Ending Balance		1,002
MBS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	1,002
Ending Balance	797	1,002
MBS [Member] | Private label [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	1,000	0
Addtions for securities for which previous expected credit losses were recognized (provision for credit losses)	(136)	1,333
Net charge-offs	(69)	(331)
Ending Balance	797	1,000
Puerto Rico government obligations [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	308	0
Addtions for securities for which previous expected credit losses were recognized (provision for credit losses)	0	308
Net charge-offs	0	0
Ending Balance	$ 308	$ 308