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LOANS HELD FOR INVESTMENT - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable Unamortized Loan Fee Cost |  |  | $ 11,200 | $ 4,300 |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 11,552,825 | 11,060,658 |  |
Interest Receivable |  |  | 69,730 | 61,507 |  |
Financing Receivable Allowance For Credit Losses |  | $ 385,887 | 260,464 | 269,030 | $ 385,887 | $ 155,139
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 57,330 | 80,710 | 64,540 |
Loans and finance leases |  |  | 25,679 | (61,720) | 168,717 |
Interest Income Recognized on Nonaccrual Loans |  |  | 1,500 | 2,300 | 2,000 |
Finance lease, unearned income |  |  | 99,200 | 75,800 |  |
Unearned income |  |  | 103,400 | 79,000 |  |
Asset Pledged as Collateral [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 4,300,000 | 4,100,000 |  |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 1,800,000 | 1,800,000 |  |
Asset Pledged as Collateral [Member] | Federal Reserve Bank Advances [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,200,000 | 2,100,000 |  |
TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 36,319 | 366,700 |  | 36,319 |
Puerto Rico [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross |  | 9,367,032 | $ 9,097,013 | 8,755,434 | 9,367,032 |
Puerto Rico [Member] | Product Concentration Risk [Member] | Loan Portfolio [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] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 2,088,351 | 1,946,740 |  |
Loans and Leases Receivable, Gross |  | 1,993,797 | $ 2,088,351 | 1,948,716 | 1,993,797 |
United States [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit risk concentration |  |  | 18.00% |  |  |
USVI and BVI [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit risk concentration |  |  | 3.00% |  |  |
USVI [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross |  | 466,749 | $ 379,767 | 391,663 | 466,749 |
Performing loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  | 328,100 | 363,400 |  |
Nonaccrual loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable Accrued Interest Writeoff |  |  | $ 1,700 | $ 2,000 | 1,900 |
Collateral Pledged [Member] | Weighted Average [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
LTV Coverage % |  |  | 70.00% | 78.00% |  |
Loans and Finance Receivables [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest Receivable |  |  | $ 53,100 | $ 48,100 |  |
Commercial And Industrial Sector [Member] | Collateral Pledged [Member] | Puerto Rico [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Increase (decrease) in loans |  |  | $ 16,200 |  |  |
Commercial And Industrial Sector [Member] | Collateral Pledged [Member] | Weighted Average [Member] | Puerto Rico [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
LTV Coverage % |  |  | 116.00% |  |  |
GNMA [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pooled amount |  | 219,600 | $ 144,500 | 190,800 | 219,600 |
Recognized gain on sale |  |  | 4,200 | 8,800 | 9,900 |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Servicing Portfolio |  |  | 3,900,000 | 4,000,000 |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,847,290 | 2,978,895 |  |
Residential mortgage loans in process of foreclosure |  |  | $ 72,400 |  |  |
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 |  | 120,311 | $ 62,760 | 74,837 | 120,311 | 44,806
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 6,890 | 33,294 | 11,017 |
Loans and finance leases |  |  | (8,734) | (16,957) | 22,427 |
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 |  |  | 84,700 | 92,800 |  |
Residential Portfolio Segment [Member] | United States [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 429,390 | 429,322 |  |
Residential Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,804,518 | 2,923,768 |  |
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 |  |  | 422,089 | 422,170 |  |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 42,772 | 55,127 |  |
Financing Receivable, Sale | $ 54,500 |  |  |  |  |
Financing Receivable Significant Sales Book Value | 52,500 |  |  |  |  |
Escrow Deposit Related To Loans Sold | 2,000 |  |  |  |  |
Proceeds From Sale Of Loans Receivable | $ 31,500 |  |  |  |  |
Financing Receivable, Percent Of Book Value Before Reserves | 58.00% |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | $ 23,100 |  |  |  |  |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] | Loans Sold [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses | 20,900 |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 23,100 |  |  |  |  |
Loans and finance leases | $ 2,100 |  |  |  |  |
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 |  |  | 7,301 | 7,152 |  |
Residential Portfolio Segment [Member] | PCD loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 101,700 |  |  |
Residential mortgage loans in process of foreclosure |  |  | 10,000 |  |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,729,132 | 2,853,503 |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 8,307 | 240,600 |  | 8,307 |
Loans in trial |  |  | 700 |  |  |
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 |  |  | 428,648 | 428,582 |  |
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 |  |  | 2,686,360 | 2,798,376 |  |
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 |  |  | 421,347 | 421,430 |  |
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 |  |  | 42,772 | 55,127 |  |
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 |  |  | 7,301 | 7,152 |  |
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 |  |  | 118,158 | 125,392 |  |
Residential mortgage loans in process of foreclosure |  |  | 29,400 |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  | 53,900 | 57,600 |  |
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 |  |  | 742 | 740 |  |
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 |  |  | 118,158 | 125,392 |  |
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 |  |  | 742 | 740 |  |
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] | FNMA and FHLMC Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Purchase |  |  | 400 | 300 | 42 |
Residential Portfolio Segment [Member] | FNMA and FHLMC Loans | Performing loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gain from sale of loans |  |  | 4,200 | 11,400 | 8,300 |
Residental mortgage loans sold |  |  | 93,800 | 328,200 | 255,000 |
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 |  |  | 10,400 | 7,200 |  |
Financing Receivable, Purchase |  |  | 8,200 | 1,100 | 55,000 |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Servicing Portfolio |  |  | 305,100 | 383,500 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 169,800 | 178,400 |  |
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 |  |  | 10,800 |  |  |
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 |  |  |
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 |  |  | 28,900 |  |  |
Commercial Portfolio Segment [Member] | United States [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Sale |  |  |  | 43,100 |  |
Commercial Portfolio Segment [Member] | USVI [Member] | Government [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 38,000 | 39,200 |  |
Commercial Portfolio Segment [Member] | COVID-19 [Member] | Federal Home Loan Bank Of New York [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Sale |  | 175,100 |  |  |  |
Loan Originations |  | 184,400 |  |  |  |
Loan Originations Number Of Agreements |  |  | 23 |  |  |
Commercial Portfolio Segment [Member] | PCD loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 1,900 |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 132,953 | 138,999 |  |
Financing Receivable Allowance For Credit Losses |  | 5,380 | 2,308 | 4,048 | 5,380 | 2,370
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 123 | 87 | 76 |
Loans and finance leases |  |  | (2,342) | (1,408) | 2,105 |
Commercial Portfolio Segment [Member] | Construction loans [Member] | TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 0 | 1,200 |  | 0 |
Commercial Portfolio Segment [Member] | Construction loans [Member] | Puerto Rico [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Sale |  |  | 3,100 |  |  |
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 |  |  | 98,181 | 95,866 |  |
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 |  |  | 27,400 |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,358,851 | 2,167,469 |  |
Financing Receivable Allowance For Credit Losses |  | 109,342 | 35,064 | 52,771 | 109,342 | 39,194
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 85 | 1,494 | 3,330 |
Loans and finance leases |  |  | (18,994) | (55,358) | 81,125 |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 824 | 63,300 |  | 824 |
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 |  |  | 524,647 | 465,238 |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 2,886,263 | 2,887,251 |  |
Financing Receivable Allowance For Credit Losses |  | 37,944 | 32,906 | 34,284 | 37,944 | 15,198
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 2,067 | 1,887 | 3,634 |
Loans and finance leases |  |  | (1,770) | (8,549) | 6,627 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  | 22,524 | 49,600 |  | 22,524 |
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 |  |  |
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 |  |  | 1,026,154 | 940,654 |  |
Financing Receivable, Purchase |  |  | 135,400 | 174,700 | 40,000 |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | United States [Member] | Criticized [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Sale |  |  | 23,900 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 3,327,468 | 2,888,044 |  |
Financing Receivable Allowance For Credit Losses |  | $ 112,910 | 127,426 | 103,090 | 112,910 | $ 53,571
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 48,165 | 43,948 | 46,483 |
Loans and finance leases |  |  | 57,519 | 20,552 | $ 56,433 |
Consumer Portfolio Segment [Member] | TDR [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring |  |  | 12,000 |  |  |
Outstanding unfunded commitments on TDR loans |  |  | 4 |  |  |
Consumer Portfolio Segment [Member] | United States [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 9,979 | 15,660 |  |
Consumer Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 3,312,662 | 2,877,590 |  |
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 |  |  | 9,784 | 15,527 |  |
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 14,806 | 10,454 |  |
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 |  |  | $ 195 | $ 133 |  |

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- Definition Escrow Deposit Related To Loans Sold + References No definition available. + Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable, Percent Of Book Value Before Reserves + References No definition available. + Details
Name: | fbp_FinancingReceivablePercentOfBookValueBeforeReserves
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