LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans held for investment	$ 11,577,985	$ 11,552,825
ACL for loans and finance leases	(265,567)	(260,464)	$ (245,447)	$ (269,030)
Loans held for investment, net	11,312,418	11,292,361
Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	9,598,623	9,464,474
Florida region [Member}
Loans held for investment	1,979,362	2,088,351
Residential Portfolio Segment [Member]
Loans held for investment	2,811,528	2,847,290
ACL for loans and finance leases	(64,403)	(62,760)	(68,820)	(74,837)
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	2,381,782	2,417,900
Residential Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	429,746	429,390
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]
Loans held for investment	2,862,189	2,886,263
ACL for loans and finance leases	(31,235)	(32,906)	(36,784)	(34,284)
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,941,228	1,860,109
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Florida region [Member}
Loans held for investment	920,961	1,026,154
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans held for investment	2,353,659	2,358,851
ACL for loans and finance leases	(36,460)	(35,064)	(30,138)	(52,771)
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,829,173	1,834,204
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member}
Loans held for investment	524,486	524,647
Commercial Portfolio Segment [Member] | Construction loans [Member]
Loans held for investment	143,664	132,953
ACL for loans and finance leases	(3,231)	(2,308)	(1,842)	(4,048)
Commercial Portfolio Segment [Member] | Construction loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	48,195	34,772
Commercial Portfolio Segment [Member] | Construction loans [Member] | Florida region [Member}
Loans held for investment	95,469	98,181
Consumer Portfolio Segment [Member]
Loans held for investment	3,406,945	3,327,468
ACL for loans and finance leases	(130,238)	(127,426)	$ (107,863)	$ (103,090)
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	3,398,245	3,317,489
Consumer Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	$ 8,700	$ 9,979