LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans held for investment	$ 11,206,874	$ 11,060,658
Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	9,217,727	9,113,918
Florida region [Member}
Loans held for investment	1,989,147	1,946,740
Residential Portfolio Segment [Member]
Loans held for investment	2,851,685	2,978,895
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	2,444,532	2,549,573
Residential Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	407,153	429,322
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]
Loans held for investment	2,862,917	2,887,251
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,869,210	1,946,597
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Florida region [Member}
Loans held for investment	993,707	940,654
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans held for investment	2,270,113	2,167,469
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	1,784,879	1,702,231
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member}
Loans held for investment	485,234	465,238
Commercial Portfolio Segment [Member] | Construction loans [Member]
Loans held for investment	115,310	138,999
Commercial Portfolio Segment [Member] | Construction loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	25,477	43,133
Commercial Portfolio Segment [Member] | Construction loans [Member] | Florida region [Member}
Loans held for investment	89,833	95,866
Consumer Portfolio Segment [Member]
Loans held for investment	3,106,849	2,888,044
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Loans held for investment	3,093,629	2,872,384
Consumer Portfolio Segment [Member] | Florida region [Member}
Loans held for investment	$ 13,220	$ 15,660