LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans held for investment	$ 11,552,825	$ 11,060,658
Less: ACL for loans and finance leases	(260,464)	(269,030)	$ (385,887)	$ (155,139)
Loans held for investment, net	11,292,361	10,791,628
Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	9,464,474	9,113,918
Florida region [Member}
Loans held for investment	2,088,351	1,946,740
Residential Portfolio Segment [Member]
Loans held for investment	2,847,290	2,978,895
Less: ACL for loans and finance leases	(62,760)	(74,837)	(120,311)	(44,806)
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	2,417,900	2,549,573
Residential Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	429,390	429,322
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]
Loans held for investment	2,886,263	2,887,251
Less: ACL for loans and finance leases	(32,906)	(34,284)	(37,944)	(15,198)
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,860,109	1,946,597
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Florida region [Member}
Loans held for investment	1,026,154	940,654
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans held for investment	2,358,851	2,167,469
Less: ACL for loans and finance leases	(35,064)	(52,771)	(109,342)	(39,194)
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,834,204	1,702,231
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member}
Loans held for investment	524,647	465,238
Commercial Portfolio Segment [Member] | Construction loans [Member]
Loans held for investment	132,953	138,999
Less: ACL for loans and finance leases	(2,308)	(4,048)	(5,380)	(2,370)
Commercial Portfolio Segment [Member] | Construction loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	34,772	43,133
Commercial Portfolio Segment [Member] | Construction loans [Member] | Florida region [Member}
Loans held for investment	98,181	95,866
Consumer Portfolio Segment [Member]
Loans held for investment	3,327,468	2,888,044
Less: ACL for loans and finance leases	(127,426)	(103,090)	$ (112,910)	$ (53,571)
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	3,317,489	2,872,384
Consumer Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	$ 9,979	$ 15,660