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LOANS HELD FOR INVESTMENT - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,577,985,000 |  | $ 11,552,825,000 |
Interest Receivable | 63,841,000 |  | 69,730,000 |
Financing Receivable Allowance For Credit Losses | 265,567,000 | $ 245,447,000 | 260,464,000 | $ 269,030,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 17,917,000 | 12,715,000 |  |
Loans and finance leases | 16,256,000 | (16,989,000) |  |
Interest Income Recognized on Nonaccrual Loans | 500,000 | 400,000 |  |
Loans modified to borrowers experiencing financial difficulty | 2,180,000 |  |  |
Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified to borrowers experiencing financial difficulty | $ 374,000 |  |  |
Puerto Rico [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit risk concentration | 80.00% |  |  |
United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,979,362,000 |  | $ 2,088,351,000 |
United States [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit risk concentration | 17.00% |  |  |
USVI and BVI [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit risk concentration | 3.00% |  |  |
Nonaccrual loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Accrued Interest Writeoff | $ 600,000 | 400,000 |  |
Collateral Pledged [Member] | Weighted Average [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
LTV Coverage % | 69.00% |  | 70.00% |
Loans and Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Receivable | $ 49,400,000 |  | $ 53,100,000 |
GNMA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans pooled amount | 29,400,000 | 41,500,000 |  |
Recognized gain on sale | 900,000 | 1,300,000 |  |
Residential Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,811,528,000 |  | 2,847,290,000 |
Residential mortgage loans in process of foreclosure | $ 62,600,000 |  |  |
Loans Foreclosure Delinquency Threshold | 120 days |  |  |
Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block] | The Corporation commences the foreclosure process on residential real estate loans when a borrower becomes 120 days delinquent. Foreclosure procedures and timelines vary depending on whether the property is located in a judicial or non-judicial state. Occasionally, foreclosures may be delayed due to, among other reasons, mandatory mediations, bankruptcy, court delays, and title issues. |  |  |
Financing Receivable Allowance For Credit Losses | $ 64,403,000 | 68,820,000 | 62,760,000 | 74,837,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 983,000 | 2,528,000 |  |
Loans and finance leases | 73,000 | (4,871,000) |  |
Residential Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | PRHFA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 82,900,000 |  | 84,700,000 |
Residential Portfolio Segment [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 429,746,000 |  | 429,390,000 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 |  |  |
Residential Portfolio Segment [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,775,118,000 |  | 2,804,518,000 |
Residential Portfolio Segment [Member] | Performing loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 422,329,000 |  | 422,089,000 |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 36,410,000 |  | 42,772,000 |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 7,417,000 |  | 7,301,000 |
Residential Portfolio Segment [Member] | PCD loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Residential mortgage loans in process of foreclosure | 8,800,000 |  |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,699,959,000 |  | 2,729,132,000 |
Loans modified to borrowers experiencing financial difficulty | 880,000 |  |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 429,011,000 |  | 428,648,000 |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,663,549,000 |  | 2,686,360,000 |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 421,594,000 |  | 421,347,000 |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Nonaccrual loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 36,410,000 |  | 42,772,000 |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 7,417,000 |  | 7,301,000 |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 111,569,000 |  | 118,158,000 |
Residential mortgage loans in process of foreclosure | 27,200,000 |  |  |
Loans modified to borrowers experiencing financial difficulty | 900,000 |  |  |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 735,000 |  | 742,000 |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 111,569,000 |  | 118,158,000 |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 735,000 |  | 742,000 |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonaccrual loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  | 0 |
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 0 |  | 0 |
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 7,100,000 |  | 10,400,000 |
Financing Receivable, Purchase | 1,500,000 | 500,000 |  |
Residential Portfolio Segment [Member] | FNMA [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gain from sale of loans | 200,000 | 2,100,000 |  |
Residential mortgage loans sold | 8,000,000.0 | 50,000,000.0 |  |
Residential Portfolio Segment [Member] | FHLMC [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gain from sale of loans |  | 100,000 |  |
Residential mortgage loans sold |  | 2,400,000 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 170,900,000 |  | 169,800,000 |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | PREPA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 10,200,000 |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Property Tax Revenue [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 102,700,000 |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Municipal Special Obligation Bond [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 28,000,000.0 |  |  |
Commercial Portfolio Segment [Member] | USVI [Member] | Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 38,700,000 |  | 38,000,000.0 |
Commercial Portfolio Segment [Member] | Construction loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 143,664,000 |  | 132,953,000 |
Financing Receivable Allowance For Credit Losses | 3,231,000 | 1,842,000 | 2,308,000 | 4,048,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 44,000 |  |
Loans and finance leases | 860,000 | (2,214,000) |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] | Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 95,469,000 |  | 98,181,000 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 |  |  |
Commercial Portfolio Segment [Member] | Central Government [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 30,000,000.0 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,353,659,000 |  | 2,358,851,000 |
Financing Receivable Allowance For Credit Losses | 36,460,000 | 30,138,000 | 35,064,000 | 52,771,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 18,000 | 37,000 |  |
Loans and finance leases | 1,246,000 | (22,640,000) |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 524,486,000 |  | 524,647,000 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,862,189,000 |  | 2,886,263,000 |
Financing Receivable, Purchase | 0 |  |  |
Financing Receivable Allowance For Credit Losses | 31,235,000 | 36,784,000 | 32,906,000 | 34,284,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 118,000 | 290,000 |  |
Loans and finance leases | (1,650,000) | 1,755,000 |  |
Loans modified to borrowers experiencing financial difficulty | 40,000 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans modified to borrowers experiencing financial difficulty | 0 |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 920,961,000 |  | 1,026,154,000 |
Financing Receivable, Purchase |  | 46,400,000 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,406,945,000 |  | 3,327,468,000 |
Financing Receivable Allowance For Credit Losses | 130,238,000 | 107,863,000 | 127,426,000 | $ 103,090,000
Financing Receivable, Allowance for Credit Loss, Writeoff | 16,798,000 | 9,816,000 |  |
Loans and finance leases | 15,727,000 | $ 10,981,000 |  |
Consumer Portfolio Segment [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,700,000 |  | 9,979,000 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 155,000 |  |  |
Consumer Portfolio Segment [Member] | Performing loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,391,009,000 |  | 3,312,662,000 |
Consumer Portfolio Segment [Member] | Performing loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,553,000 |  | 9,784,000 |
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 15,936,000 |  | 14,806,000 |
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 147,000 |  | $ 195,000 |

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