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LOANS HELD FOR INVESTMENT - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,206,874 |  | $ 11,206,874 |  |  | $ 11,060,658 |  |
Financing Receivable, Troubled Debt Restructuring | 394,500 |  | 394,500 |  |  |  |  |
Interest Receivable | 62,501 |  | 62,501 |  |  | 61,507 |  |
Financing Receivable Allowance For Credit Losses | 252,152 | $ 324,958 | 252,152 | $ 324,958 | $ 245,447 | 269,030 | $ 358,936 | $ 385,887
Financing Receivable, Allowance for Credit Loss, Writeoff | 12,592 | 17,866 | 25,307 | 34,100 |  |  |  |
Loans and finance leases | 12,665 | (26,302) | (4,324) | (40,745) |  |  |  |
Interest Income Recognized on Nonaccrual Loans | 300 | 800 | 700 | 1,300 |  |  |  |
United States [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,989,147 |  | 1,989,147 |  |  | 1,946,740 |  |
Performing loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 345,400 |  | 345,400 |  |  | $ 363,400 |  |
Nonaccrual loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable Accrued Interest Writeoff | $ 300 | 300 | $ 700 | 1,300 |  |  |  |
Collateral Pledged [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
LTV Coverage % | 79.00% |  | 79.00% |  |  | 78.00% |  |
Loans and Finance Receivables [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Interest Receivable | $ 47,100 |  | $ 47,100 |  |  | $ 48,100 |  |
Loans and Finance Receivables [Member] | Puerto Rico [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Credit risk concentration |  |  | 79.00% |  |  |  |  |
Loans and Finance Receivables [Member] | United States [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Credit risk concentration |  |  | 18.00% |  |  |  |  |
Loans and Finance Receivables [Member] | USVI and BVI [Member] | Product Concentration Risk [Member] | Loan Portfolio [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Credit risk concentration |  |  | 3.00% |  |  |  |  |
GNMA [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in loans |  |  | $ 79,700 | 105,900 |  |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,851,685 |  | 2,851,685 |  |  | 2,978,895 |  |
Residential mortgage loans in process of foreclosure | 84,800 |  | $ 84,800 |  |  |  |  |
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, in accordance with the requirements of the Consumer Financial Protection Bureau (“CFPB”). 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 | 65,231 | 112,882 | $ 65,231 | 112,882 | 68,820 | 74,837 | 114,044 | 120,311
Financing Receivable, Allowance for Credit Loss, Writeoff | 2,079 | 2,927 | 4,607 | 5,752 |  |  |  |
Loans and finance leases | (2,797) | 825 | (7,668) | (3,350) |  |  |  |
Residential Portfolio Segment [Member] | TDR [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans in trial |  |  | 1,900 |  |  |  |  |
Residential Portfolio Segment [Member] | Government [Member] | PRHFA [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 88,500 |  | 88,500 |  |  | 92,800 |  |
Residential Portfolio Segment [Member] | United States [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 407,153 |  | 407,153 |  |  | 429,322 |  |
Residential Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,807,097 |  | 2,807,097 |  |  | 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 | 401,181 |  | 401,181 |  |  | 422,170 |  |
Residential Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 44,588 |  | 44,588 |  |  | 55,127 |  |
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 | 5,972 |  | 5,972 |  |  | 7,152 |  |
Residential Portfolio Segment [Member] | PCD loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Residential mortgage loans in process of foreclosure | 12,100 |  | 12,100 |  |  |  |  |
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,730,525 |  | 2,730,525 |  |  | 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 | 245,400 |  | 245,400 |  |  |  |  |
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 | 406,421 |  | 406,421 |  |  | 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 | 2,685,937 |  | 2,685,937 |  |  | 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 | 400,449 |  | 400,449 |  |  | 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 | 44,588 |  | 44,588 |  |  | 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 | 5,972 |  | 5,972 |  |  | 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 | 121,160 |  | 121,160 |  |  | 125,392 |  |
Residential mortgage loans in process of foreclosure | 35,100 |  | 35,100 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 55,100 |  | 55,100 |  |  | 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 | 732 |  | 732 |  |  | 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 | 121,160 |  | 121,160 |  |  | 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 | 732 |  | 732 |  |  | 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 |  |  | 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 |  |  | 0 |  |
Residential Portfolio Segment [Member] | FNMA and FHLMC Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Purchase |  |  | 200 | 300 |  |  |  |
Residential Portfolio Segment [Member] | FNMA and FHLMC Loans | Performing loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Sale |  |  | 78,400 | 191,400 |  |  |  |
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 | 10,800 |  | 10,800 |  |  | 7,200 |  |
Financing Receivable, Purchase |  |  | 6,200 | 300 |  |  |  |
Commercial Portfolio Segment [Member] | Criticized [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Sale |  |  |  | 24,000 |  |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 171,400 |  | 171,400 |  |  | 178,400 |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Municipalities Borrower [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 28,700 |  | 28,700 |  |  |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | PREPA [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 11,700 |  | 11,700 |  |  |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Property Tax Revenue [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 99,700 |  | 99,700 |  |  |  |  |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Municipal Special Obligation Bond [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 31,300 |  | 31,300 |  |  |  |  |
Commercial Portfolio Segment [Member] | USVI [Member] | Government [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | 39,500 |  | 39,500 |  |  | 39,200 |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 115,310 |  | 115,310 |  |  | 138,999 |  |
Financing Receivable Allowance For Credit Losses | 2,020 | 4,757 | 2,020 | 4,757 | 1,842 | 4,048 | 4,915 | 5,380
Financing Receivable, Allowance for Credit Loss, Writeoff | 16 | 0 | 60 | 45 |  |  |  |
Loans and finance leases | 151 | (196) | (2,063) | (652) |  |  |  |
Commercial Portfolio Segment [Member] | Construction loans [Member] | TDR [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 1,600 |  | 1,600 |  |  |  |  |
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 | 89,833 |  | 89,833 |  |  | 95,866 |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,270,113 |  | 2,270,113 |  |  | 2,167,469 |  |
Financing Receivable Allowance For Credit Losses | 32,619 | 72,452 | 32,619 | 72,452 | 30,138 | 52,771 | 99,782 | 109,342
Financing Receivable, Allowance for Credit Loss, Writeoff | 2 | 81 | 39 | 875 |  |  |  |
Loans and finance leases | 1,265 | (27,299) | (21,375) | (36,119) |  |  |  |
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | TDR [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 65,400 |  | 65,400 |  |  |  |  |
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 | 485,234 |  | 485,234 |  |  | 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 | 2,862,917 |  | 2,862,917 |  |  | 2,887,251 |  |
Financing Receivable Allowance For Credit Losses | 36,203 | 37,470 | 36,203 | 37,470 | 36,784 | 34,284 | 32,087 | 37,944
Financing Receivable, Allowance for Credit Loss, Writeoff | 68 | 60 | 358 | 869 |  |  |  |
Loans and finance leases | (1,102) | (426) | 653 | (5,738) |  |  |  |
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | TDR [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 68,700 |  | 68,700 |  |  |  |  |
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 | 993,707 |  | 993,707 |  |  | 940,654 |  |
Financing Receivable, Purchase |  |  | 76,400 | 50,000 |  |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,106,849 |  | 3,106,849 |  |  | 2,888,044 |  |
Financing Receivable Allowance For Credit Losses | 116,079 | 97,397 | 116,079 | 97,397 | $ 107,863 | 103,090 | $ 108,108 | $ 112,910
Financing Receivable, Allowance for Credit Loss, Writeoff | 10,427 | 14,798 | 20,243 | 26,559 |  |  |  |
Loans and finance leases | 15,148 | $ 794 | 26,129 | $ 5,114 |  |  |  |
Consumer Portfolio Segment [Member] | TDR [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring | 13,400 |  | 13,400 |  |  |  |  |
Outstanding unfunded commitments on TDR loans | 10 |  | 10 |  |  |  |  |
Consumer Portfolio Segment [Member] | United States [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 13,220 |  | 13,220 |  |  | 15,660 |  |
Consumer Portfolio Segment [Member] | Performing loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,096,534 |  | 3,096,534 |  |  | 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 | 13,016 |  | 13,016 |  |  | 15,527 |  |
Consumer Portfolio Segment [Member] | Nonaccrual loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 10,315 |  | 10,315 |  |  | 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 | $ 204 |  | $ 204 |  |  | $ 133 |  |

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