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Loans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jan. 02, 2020
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | $ 29,385,196 | $ 27,406,873 |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 515,307 | 466,943 |  |
Current |  | 27,115,643 | 25,603,271 |  |
Unpaid principal balance |  |  | 1,223,205 |  |
Mortgage loans related to buy-back option program |  | 29,588,430 | 27,587,856 |  |
Past Due |  | 2,269,553 | 1,803,602 |  |
Non-accrual with no allowance |  | 203,460 |  |  |
Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Non-accrual with no allowance |  | 203,000 |  |  |
Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 1,028,064 | 460,133 |  |
Past Due |  | 1,765,838 | 1,141,100 |  |
Buy back option program |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased Loans |  | 862,000 | 104,000 |  |
Mortgage loans related to buy-back option program |  | 57,000 | 103,000 |  |
Retail |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 56,000 | 359,000 |  |
Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 1,300,000 | 423,000 |  |
Mortgage Loans Sold |  | 150,000 | 64,000 |  |
Mortgage loans related to buy-back option program |  | 1,800,000 | 1,100,000 |  |
GNMA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 332,000 | 347,000 |  |
GNMA | Buy back option program |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  |  | $ 324,000 |
GNMA | Bulk loan repurchase |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased Loans |  | 688,000 |  |  |
GNMA | Bulk loan repurchase | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased Loans |  | 684,000 |  |  |
FNMA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 176,000 | 111,000 |  |
Purchased credit deterioration loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 160,000 |  |  |
Mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 7,890,680 | 7,183,532 |  |
Current |  | 6,114,778 | 5,884,089 |  |
Unpaid principal balance |  |  | 624,368 |  |
Past Due |  | 1,775,902 | 1,299,443 |  |
Non-accrual with no allowance |  | 142,254 |  |  |
Mortgages | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 1,014,481 | 439,662 |  |
Past Due |  | 1,443,688 | 848,742 |  |
Mortgages | US Government Agency Insured Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 2,100,000 | 1,400,000 |  |
Mortgages | US Government Agency Insured Loans | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Past Due |  | 1,000,000 | 441,000 |  |
Mortgages | Guaranteed by us sponsored entities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Unpaid principal balance |  | 655,000 | 625,000 |  |
Mortgages | GNMA | Buy back option program | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 57,000 | 103,000 |  |
Commercial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 26,000 | 141,000 |  |
Loans Sold |  |  | 114,000 |  |
Commercial and construction loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans Sold |  | 32,000 |  |  |
Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 918,765 | 831,092 |  |
Current |  | 868,396 | 829,392 |  |
Unpaid principal balance |  |  | 119 |  |
Past Due |  | 50,369 | 1,700 |  |
Non-accrual with no allowance |  | 0 |  |  |
Construction | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 0 | 0 |  |
Past Due |  | 29,057 | 145 |  |
Loans with Recourse | Serviced Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased Loans |  | 161,000 | 57,000 |  |
Loans with Recourse | Serviced Mortgage Loans | Bulk loan repurchase |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased Loans | $ 120,000 | 120,000 |  |  |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  | 5,997,886 |  |
Consumer | Credit cards |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 919,966 | 1,123,836 |  |
Purchase of Loans |  |  | 74,000 |  |
Current |  | 895,996 | 1,085,089 |  |
Past Due |  | 23,970 | 38,747 |  |
Consumer | Credit cards | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 12,801 | 19,461 |  |
Past Due |  | 12,801 | 19,461 |  |
ASC Subtopic 310-30 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Outstanding principal balance of SOP loans |  |  | 1,900,000 |  |
Loans held-in-portfolio, net of unearned income |  |  | 153,000 |  |
Accruing loans past-due 90 days or more |  |  |  |  | $ 144,000
Current |  |  |  |  | 134,000
Puerto Rico |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 21,573,280 | 20,180,232 |  |
Current |  | 19,426,598 | 18,451,825 |  |
Unpaid principal balance |  |  | 1,200,673 |  |
Past Due |  | 2,146,682 | 1,728,407 |  |
Non-accrual with no allowance |  | 202,943 |  |  |
Puerto Rico | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 1,028,061 | 460,133 |  |
Past Due |  | 1,728,438 | 1,093,390 |  |
Puerto Rico | Mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 6,770,143 | 6,166,748 |  |
Current |  | 5,057,991 | 4,897,894 |  |
Unpaid principal balance |  |  | 614,267 |  |
Past Due |  | 1,712,152 | 1,268,854 |  |
Non-accrual with no allowance |  | 141,737 |  |  |
Puerto Rico | Mortgages | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 1,014,481 | 439,662 |  |
Past Due |  | 1,428,824 | 837,651 |  |
Puerto Rico | Reverse Mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Current |  | 60,000 | 65,000 |  |
Puerto Rico | Residential mortgage loans insured By FHA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 329,000 | 213,000 |  |
Puerto Rico | Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 157,106 | 137,470 |  |
Current |  | 135,609 | 135,796 |  |
Unpaid principal balance |  |  | 119 |  |
Past Due |  | 21,497 | 1,674 |  |
Non-accrual with no allowance |  | 0 |  |  |
Puerto Rico | Construction | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 0 | 0 |  |
Past Due |  | 21,497 | 119 |  |
Puerto Rico | Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  | 5,555,377 |  |
Puerto Rico | Consumer | Credit cards |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 919,935 | 1,123,800 |  |
Current |  | 895,968 | 1,085,053 |  |
Past Due |  | 23,967 | 38,747 |  |
Puerto Rico | Consumer | Credit cards | Past Due 90 Days or More |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 12,798 | 19,461 |  |
Past Due |  | $ 12,798 | 19,461 |  |
Puerto Rico | ASC Subtopic 310-30 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  | $ 134,000 |  |
Accruing loans past-due 90 days or more |  |  |  |  | 125,000
Current |  |  |  |  | $ 134,000

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Data Type: | na
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