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LOANS HELD FOR INVESTMENT - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 68,783,000 |  | $ 68,783,000 |  | $ 69,730,000
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 20,259,000 | $ 14,062,000 | 62,260,000 | $ 39,369,000 |
Loans and finance leases | 10,643,000 | 14,352,000 | 47,669,000 | 10,028,000 |
Interest Income Recognized on Nonaccrual Loans | 400,000 | 300,000 | 1,400,000 | 1,000,000.0 |
Loans modified to borrowers experiencing financial difficulty | 4,143,000 |  | 37,965,000 |  |
Revolving loans converted to term loans | 0 |  | 0 |  | 0
Loans held for investment | 11,950,932,000 |  | 11,950,932,000 |  | 11,552,825,000
Asset Pledged as Collateral [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 4,400,000,000 |  | 4,400,000,000 |  | 4,300,000,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Borrowings [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 1,800,000,000 |  | 1,800,000,000 |  | 1,800,000,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 2,400,000,000 |  | 2,400,000,000 |  | 2,200,000,000
Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans modified to borrowers experiencing financial difficulty |  |  | 358,000 |  |
Unisured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 68,200,000 |  | $ 68,200,000 |  | 123,700,000
Puerto Rico [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Credit risk concentration |  |  | 79.00% |  |
United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 2,044,643,000 |  | $ 2,044,643,000 |  | $ 2,088,351,000
United States [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Credit risk concentration |  |  | 17.00% |  |
USVI and BVI [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Credit risk concentration |  |  | 4.00% |  |
Nonaccrual loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable Accrued Interest Writeoff | $ 900,000 | 500,000 | $ 2,000,000.0 | 1,200,000 |
Collateral Pledged [Member] | Weighted Average [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
LTV Coverage % | 72.00% |  | 72.00% |  | 70.00%
Loans and Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 55,200,000 |  | $ 55,200,000 |  | $ 53,100,000
GNMA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pooled amount | 102,900,000 | 115,700,000 | 102,900,000 | 115,700,000 |
Recognized gain on sale |  |  | 2,200,000 | 3,200,000 |
Residential Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Residential mortgage loans in process of foreclosure | 43,800,000 |  | $ 43,800,000 |  |
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, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 499,000 | 1,466,000 | $ 2,628,000 | 6,073,000 |
Loans and finance leases | (3,349,000) | 755,000 | (6,776,000) | (6,913,000) |
Loans held for investment | 2,812,631,000 |  | 2,812,631,000 |  | 2,847,290,000
Residential Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | PRHFA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 79,300,000 |  | 79,300,000 |  | 84,700,000
Residential Portfolio Segment [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 6,000 |  |
Loans held for investment | 458,952,000 |  | 458,952,000 |  | 429,390,000
Residential Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 2,780,685,000 |  | 2,780,685,000 |  | 2,804,518,000
Residential Portfolio Segment [Member] | Performing loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 452,255,000 |  | 452,255,000 |  | 422,089,000
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 31,946,000 |  | 31,946,000 |  | 42,772,000
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 6,697,000 |  | 6,697,000 |  | 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 | 6,100,000 |  | 6,100,000 |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans modified to borrowers experiencing financial difficulty | 401,000 |  | 1,536,000 |  |
Loans held for investment | 2,708,535,000 |  | 2,708,535,000 |  | 2,729,132,000
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 |  |  | 71,000 |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 457,988,000 |  | 457,988,000 |  | 428,648,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 2,676,589,000 |  | 2,676,589,000 |  | 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] |  |  |  |  |
Loans held for investment | 451,291,000 |  | 451,291,000 |  | 421,347,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Nonaccrual loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 31,946,000 |  | 31,946,000 |  | 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] |  |  |  |  |
Loans held for investment | 6,697,000 |  | 6,697,000 |  | 7,301,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Residential mortgage loans in process of foreclosure | 18,400,000 |  | 18,400,000 |  |
Loans modified to borrowers experiencing financial difficulty | 900,000 |  | 3,200,000 |  |
Loans held for investment | 104,096,000 |  | 104,096,000 |  | 118,158,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 964,000 |  | 964,000 |  | 742,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 104,096,000 |  | 104,096,000 |  | 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] |  |  |  |  |
Loans held for investment | 964,000 |  | 964,000 |  | 742,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Nonaccrual loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 0 |  | 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] |  |  |  |  |
Loans held for investment | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] | FNMA and FHLMC Loans | Performing loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gain from sale of loans |  |  | 700,000 | 4,000,000.0 |
Residential mortgage loans sold |  |  | 28,600,000 | 90,800,000 |
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Purchase |  |  | 2,500,000 | 8,200,000 |
Loans held for investment | 8,500,000 |  | 8,500,000 |  | 10,400,000
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Sale |  |  | 0 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 185,000,000.0 |  | 185,000,000.0 |  | 169,800,000
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | PREPA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 8,900,000 |  | 8,900,000 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Property Tax Revenue [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 115,800,000 |  | 115,800,000 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Municipal Special Obligation Bond [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 25,600,000 |  | 25,600,000 |  |
Commercial Portfolio Segment [Member] | USVI [Member] | Government [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 87,500,000 |  | 87,500,000 |  | 38,000,000.0
Commercial Portfolio Segment [Member] | Construction loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 4,000 | 63,000 | 42,000 | 123,000 |
Loans and finance leases | (642,000) | (179,000) | 1,420,000 | (2,242,000) |
Loans modified to borrowers experiencing financial difficulty | 0 |  | 0 |  |
Loans held for investment | 202,774,000 |  | 202,774,000 |  | 132,953,000
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, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 0 |  |
Loans held for investment | 100,447,000 |  | 100,447,000 |  | 98,181,000
Commercial Portfolio Segment [Member] | Central Government [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 34,700,000 |  | 34,700,000 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 1,000 | 3,000 | 107,000 | 42,000 |
Loans and finance leases | (1,344,000) | (2,383,000) | 5,901,000 | (23,758,000) |
Loans modified to borrowers experiencing financial difficulty | 2,225,000 |  | 32,395,000 |  |
Loans held for investment | 2,316,113,000 |  | 2,316,113,000 |  | 2,358,851,000
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, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 0 |  |
Loans held for investment | 536,105,000 |  | 536,105,000 |  | 524,647,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 9,000 | 8,000 | 6,477,000 | 366,000 |
Loans and finance leases | 1,931,000 | (1,228,000) | 3,278,000 | (575,000) |
Loans modified to borrowers experiencing financial difficulty | 192,000 |  | 377,000 |  |
Loans held for investment | 3,030,954,000 |  | 3,030,954,000 |  | 2,886,263,000
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] | Puerto Rico [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Sale |  |  |  | 35,200,000 |
Increase (decrease) in loans | 9,500,000 |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Purchase |  |  | 61,300,000 | 135,400,000 |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 6,202,000 |  |
Loans held for investment | 942,680,000 |  | 942,680,000 |  | 1,026,154,000
Consumer Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 19,746,000 | 12,522,000 | 53,006,000 | 32,765,000 |
Loans and finance leases | 14,047,000 | $ 17,387,000 | 43,846,000 | $ 43,516,000 |
Loans held for investment | 3,588,460,000 |  | 3,588,460,000 |  | 3,327,468,000
Consumer Portfolio Segment [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 286,000 |  |
Loans held for investment | 6,459,000 |  | 6,459,000 |  | 9,979,000
Consumer Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 3,569,323,000 |  | 3,569,323,000 |  | 3,312,662,000
Consumer Portfolio Segment [Member] | Performing loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 6,361,000 |  | 6,361,000 |  | 9,784,000
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | 19,137,000 |  | 19,137,000 |  | 14,806,000
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] | United States [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans held for investment | $ 98,000 |  | $ 98,000 |  | $ 195,000

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