LOANS HELD FOR INVESTMENT - Corporation's Nonaccrual Status and Loans 90 Days or More Still Accruing (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	$ 27,733	$ 46,736
Nonaccrual Loans with ACL	82,984	158,353
Total Nonaccrual Loans	110,717	205,089
Loans Past Due 90 days or more and Still Accruing	114,679	145,095
Interest Income Recognized on Nonaccrual Loans	2,270	2,029
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	27,265	43,591
Nonaccrual Loans with ACL	75,216	145,691
Total Nonaccrual Loans	102,481	189,282
Loans Past Due 90 days or more and Still Accruing	114,497	144,845
Interest Income Recognized on Nonaccrual Loans	1,979	1,653
Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	468	3,145
Nonaccrual Loans with ACL	7,768	12,662
Total Nonaccrual Loans	8,236	15,807
Loans Past Due 90 days or more and Still Accruing	182	250
Interest Income Recognized on Nonaccrual Loans	291	376
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	3,689	15,002
Nonaccrual Loans with ACL	51,438	110,365
Total Nonaccrual Loans	55,127	125,367
Loans Past Due 90 days or more and Still Accruing	28,433	38,834
Interest Income Recognized on Nonaccrual Loans	1,617	1,335
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	3,689	12,418
Nonaccrual Loans with ACL	44,286	98,527
Total Nonaccrual Loans	47,975	110,945
Loans Past Due 90 days or more and Still Accruing	28,433	38,834
Interest Income Recognized on Nonaccrual Loans	1,406	1,050
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	2,584
Nonaccrual Loans with ACL	7,152	11,838
Total Nonaccrual Loans	7,152	14,422
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	211	285
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	65,515	99,243
Interest Income Recognized on Nonaccrual Loans	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	65,394	98,993
Interest Income Recognized on Nonaccrual Loans	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	121	250
Interest Income Recognized on Nonaccrual Loans	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	11,393	15,385
Nonaccrual Loans with ACL	5,742	5,496
Total Nonaccrual Loans	17,135	20,881
Loans Past Due 90 days or more and Still Accruing	7,827	2,246
Interest Income Recognized on Nonaccrual Loans	183	157
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member} | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	10,925	14,824
Nonaccrual Loans with ACL	5,259	5,496
Total Nonaccrual Loans	16,184	20,320
Loans Past Due 90 days or more and Still Accruing	7,766	2,246
Interest Income Recognized on Nonaccrual Loans	113	86
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member} | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	468	561
Nonaccrual Loans with ACL	483	0
Total Nonaccrual Loans	951	561
Loans Past Due 90 days or more and Still Accruing	61	0
Interest Income Recognized on Nonaccrual Loans	70	71
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	8,289	11,777
Nonaccrual Loans with ACL	17,048	17,834
Total Nonaccrual Loans	25,337	29,611
Loans Past Due 90 days or more and Still Accruing	9,919	3,252
Interest Income Recognized on Nonaccrual Loans	201	194
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	8,289	11,777
Nonaccrual Loans with ACL	17,048	17,834
Total Nonaccrual Loans	25,337	29,611
Loans Past Due 90 days or more and Still Accruing	9,919	3,252
Interest Income Recognized on Nonaccrual Loans	201	194
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	1,000	4,546
Nonaccrual Loans with ACL	1,664	8,425
Total Nonaccrual Loans	2,664	12,971
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	61	80
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	1,000	4,546
Nonaccrual Loans with ACL	1,664	8,425
Total Nonaccrual Loans	2,664	12,971
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	61	80
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Auto loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	3,146	26
Nonaccrual Loans with ACL	3,538	8,861
Total Nonaccrual Loans	6,684	8,887
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	99	176
Consumer Portfolio Segment [Member] | Auto loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	3,146	26
Nonaccrual Loans with ACL	3,538	8,638
Total Nonaccrual Loans	6,684	8,664
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	99	164
Consumer Portfolio Segment [Member] | Auto loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	223
Total Nonaccrual Loans	0	223
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	12
Consumer Portfolio Segment [Member] | Finance Leases [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	196	0
Nonaccrual Loans with ACL	670	1,466
Total Nonaccrual Loans	866	1,466
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	2	25
Consumer Portfolio Segment [Member] | Finance Leases [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	196	0
Nonaccrual Loans with ACL	670	1,466
Total Nonaccrual Loans	866	1,466
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	2	25
Consumer Portfolio Segment [Member] | Finance Leases [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Personal Loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	1,208	1,623
Total Nonaccrual Loans	1,208	1,623
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	92	49
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	1,208	1,623
Total Nonaccrual Loans	1,208	1,623
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	92	49
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	2,985	1,520
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	2,985	1,520
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	0	0
Total Nonaccrual Loans	0	0
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	0	0
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	20	0
Nonaccrual Loans with ACL	1,676	4,283
Total Nonaccrual Loans	1,696	4,283
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	15	13
Consumer Portfolio Segment [Member] | Other Loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	20	0
Nonaccrual Loans with ACL	1,543	3,682
Total Nonaccrual Loans	1,563	3,682
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	5	5
Consumer Portfolio Segment [Member] | Other Loans [Member] | Florida region [Member}
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual Loans with ACL	133	601
Total Nonaccrual Loans	133	601
Loans Past Due 90 days or more and Still Accruing	0	0
Interest Income Recognized on Nonaccrual Loans	$ 10	$ 8