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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Loans held for investment | $ 11,950,932 |  | $ 11,552,825 |  |  |
ACL for loans and finance leases | (263,615) | $ (267,058) | (260,464) | $ (257,859) | $ (252,152) | $ (269,030)
Loans held for investment, net | 11,687,317 |  | 11,292,361 |  |  |
Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 9,906,289 |  | 9,464,474 |  |  |
Florida region [Member} |  |  |  |  |  |
Loans held for investment | 2,044,643 |  | 2,088,351 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Loans held for investment | 2,812,631 |  | 2,847,290 |  |  |
ACL for loans and finance leases | (57,200) | (60,514) | (62,760) | (65,079) | (65,231) | (74,837)
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 2,353,679 |  | 2,417,900 |  |  |
Residential Portfolio Segment [Member] | Florida region [Member} |  |  |  |  |  |
Loans held for investment | 458,952 |  | 429,390 |  |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] |  |  |  |  |  |
Loans held for investment | 3,030,954 |  | 2,886,263 |  |  |
ACL for loans and finance leases | (30,097) | (28,014) | (32,906) | (35,461) | (36,203) | (34,284)
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 2,088,274 |  | 1,860,109 |  |  |
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member] | Florida region [Member} |  |  |  |  |  |
Loans held for investment | 942,680 |  | 1,026,154 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Loans held for investment | 2,316,113 |  | 2,358,851 |  |  |
ACL for loans and finance leases | (41,157) | (42,427) | (35,064) | (30,290) | (32,619) | (52,771)
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 1,780,008 |  | 1,834,204 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member} |  |  |  |  |  |
Loans held for investment | 536,105 |  | 524,647 |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] |  |  |  |  |  |
Loans held for investment | 202,774 |  | 132,953 |  |  |
ACL for loans and finance leases | (5,621) | (4,804) | (2,308) | (1,821) | (2,020) | (4,048)
Commercial Portfolio Segment [Member] | Construction loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 102,327 |  | 34,772 |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] | Florida region [Member} |  |  |  |  |  |
Loans held for investment | 100,447 |  | 98,181 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Loans held for investment | 3,588,460 |  | 3,327,468 |  |  |
ACL for loans and finance leases | (129,540) | $ (131,299) | (127,426) | $ (125,208) | $ (116,079) | $ (103,090)
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |  |  |  |
Loans held for investment | 3,582,001 |  | 3,317,489 |  |  |
Consumer Portfolio Segment [Member] | Florida region [Member} |  |  |  |  |  |
Loans held for investment | $ 6,459 |  | $ 9,979 |  |  |

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