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LOANS HELD FOR INVESTMENT - Additional Information IV (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | $ 12,311,448 |  | $ 12,311,448 | $ 12,185,483
Loans modified to borrowers experiencing financial difficulty | 2,559 | $ 2,180 | 40,135 |
Puerto Rico [Member] | Product Concentration Risk [Member] | Loans and Finance Receivables [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] |  |  |  |
Loans held for investment | 2,103,118 |  | 2,103,118 | $ 2,022,261
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 |  |  |  | 3.00%
Residential Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 2,801,587 |  | 2,801,587 | $ 2,821,726
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 99,655 |  | 99,655 | 100,236
Loans modified to borrowers experiencing financial difficulty | 1,100 | $ 900 |  |
Residential Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Puerto Rico Housing Finance Authority [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 76,500 |  | 76,500 | 77,700
Residential Portfolio Segment [Member] | United States [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 474,347 |  | 474,347 | 465,720
Residential Portfolio Segment [Member] | United States [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 701 |  | 701 | 943
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 203,500 |  | 203,500 | 187,700
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Central Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 39,600 |  | 39,600 |
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 | 129,400 |  | 129,400 |
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 |  | 25,600 |
Commercial Portfolio Segment [Member] | Puerto Rico [Member] | Government [Member] | Puerto Rico Electric Power Authority [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | 8,900 |  | 8,900 |
Commercial Portfolio Segment [Member] | V I [Member] | Government [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans held for investment | $ 97,400 |  | $ 97,400 | $ 90,500

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