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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans held for investment (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Past Due [Line Items] |  |  |
Threshold Period Past Due Of Financing Receivables To Be Considered Nonperforming |  | 90 days |
Troubled Debt Restructurings Sustained Performance Period |  | 6 months |
Loans held for investment |  | $ 11,552,825 | $ 11,060,658
Minimum balance of uncollectible loans to be written down |  | 500 |
BSPR |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Fair value of PCD loans | $ 752,800 |  |
ACL for PCD loans | $ 28,700 |  |
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 2,847,290 | 2,978,895
Loans Foreclosure Delinquency Threshold |  | 120 days |
Financing Receivable, Threshold Period Past Due, Writeoff |  | 180 days |
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 42,772 | 55,127
Residential Portfolio Segment [Member] | PCD loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 101,700 |
Residential Portfolio Segment [Member] | Puerto Rico Housing Finance Authority [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Period Of Guaranteed Residential Mortgage Loans That Are No Longer Accruing Interest |  | 90 days |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Period Of Guaranteed Residential Mortgage Loans That Are No Longer Accruing Interest |  | 15 months |
Loans held for investment |  | $ 118,158 | 125,392
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 0 | 0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico Housing Finance Authority [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past due 90 days and still accruing |  | 90 days |
Commercial Portfolio Segment [Member] | PCD loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 1,900 |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 2,358,851 | 2,167,469
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 2,886,263 | 2,887,251
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 132,953 | 138,999
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 3,327,468 | 2,888,044
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 14,806 | 10,454
Consumer Portfolio Segment [Member] | Auto loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 1,798,071 | 1,571,540
Consumer Portfolio Segment [Member] | Auto loans [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 10,672 | 6,684
Consumer Portfolio Segment [Member] | Personal Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 353,246 | 316,182
Financing Receivable, Threshold Period Past Due, Writeoff |  | 120 days |
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 1,248 | 1,208
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 146,190 | 135,091
Consumer Portfolio Segment [Member] | Other Loans [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 1,241 | 1,696
Consumer Portfolio Segment [Member] | Finance Leases [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 718,230 | 575,005
Consumer Portfolio Segment [Member] | Finance Leases [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | 1,645 | 866
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 311,731 | 290,226
Financing Receivable, Threshold Period Past Due, Writeoff |  | 180 days |
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Nonperforming Financial Instruments [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment |  | $ 0 | $ 0

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