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Loans - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jan. 02, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | $ 29,392,510,000 | $ 27,007,975,000 | $ 29,392,510,000 | $ 27,007,975,000 |  |  | $ 27,406,873,000
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds | 155,703,000 | 122,874,000 | 311,836,000 | 337,140,000 |  |  |
Current | 26,880,536,000 |  | 26,880,536,000 |  |  |  | 25,603,271,000
Unpaid principal balance |  |  |  |  |  |  | 1,223,205,000
Mortgage loans related to buy-back option program | 29,586,348,000 |  | 29,586,348,000 |  |  |  | 27,587,856,000
Past Due | 2,511,974,000 |  | 2,511,974,000 |  |  |  | 1,803,602,000
Non-accrual with no allowance | 218,618,000 |  | 218,618,000 |  |  |  |
Collateral Pledged |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Non-accrual with no allowance | 218,000,000 |  | 218,000,000 |  |  |  |
Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 1,212,947,000 |  | 1,212,947,000 |  |  |  | 460,133,000
Past Due | 1,947,315,000 |  | 1,947,315,000 |  |  |  | 1,141,100,000
Buy back option program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Mortgage loans related to buy-back option program | 161,000,000 |  | 161,000,000 |  |  |  | 103,000,000
Retail |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Purchase of Loans | 0 | 64,000,000 | 56,000,000 | 222,000,000 |  |  |
Residential Mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Purchase of Loans | 941,000,000 | 81,000,000 | 1,100,000,000 | 266,000,000 |  |  |
Mortgage Loans Sold | 62,000,000 | 18,000,000 | 101,000,000 | 46,000,000 |  |  |
GNMA |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds | 100,000,000 | 88,000,000 | 214,000,000 | 247,000,000 |  |  |
GNMA | Buy back option program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  |  |  | $ 324,000,000 |  |
GNMA | Bulk loan repurchase |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Repurchased Loans | 688,000,000 |  |  |  |  |  |
GNMA | Bulk loan repurchase | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Repurchased Loans | 684,000,000 |  |  |  |  |  |
FNMA |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds | 54,000,000 | 33,000,000 | 94,000,000 | 84,000,000 |  |  |
Purchased credit deterioration loan |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Purchase of Loans | 137,000,000 |  | 143,000,000 |  |  |  |
Mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 7,924,441,000 | 7,168,619,000 | 7,924,441,000 | 7,168,619,000 |  |  | 7,183,532,000
Current | 5,937,343,000 |  | 5,937,343,000 |  |  |  | 5,884,089,000
Unpaid principal balance |  |  |  |  |  |  | 624,368,000
Past Due | 1,987,098,000 |  | 1,987,098,000 |  |  |  | 1,299,443,000
Non-accrual with no allowance | 145,769,000 |  | 145,769,000 |  |  |  |
Mortgages | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 1,197,444,000 |  | 1,197,444,000 |  |  |  | 439,662,000
Past Due | 1,581,988,000 |  | 1,581,988,000 |  |  |  | 848,742,000
Mortgages | US Government Agency Insured Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 2,100,000,000 |  | 2,100,000,000 |  |  |  | 1,400,000,000
Mortgages | US Government Agency Insured Loans | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Past Due | 1,200,000,000 |  | 1,200,000,000 |  |  |  | 441,000,000
Mortgages | Guaranteed by us sponsored entities |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Unpaid principal balance | 650,000,000 |  | 650,000,000 |  |  |  | 625,000,000
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 | 161,000,000 |  | 161,000,000 |  |  |  | 103,000,000
Commercial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Purchase of Loans | 0 | 0 | 3,000,000 | 43,000,000 |  |  |
Commercial and construction loan |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Mortgage Loans Sold | 1,000,000 | 47,000,000 | 7,000,000 | 81,000,000 |  |  |
Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 936,274,000 | 754,056,000 | 936,274,000 | 754,056,000 |  |  | 831,092,000
Current | 900,796,000 |  | 900,796,000 |  |  |  | 829,392,000
Unpaid principal balance |  |  |  |  |  |  | 119,000
Past Due | 35,478,000 |  | 35,478,000 |  |  |  | 1,700,000
Non-accrual with no allowance | 0 |  | 0 |  |  |  |
Construction | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 0 |  | 0 |  |  |  | 0
Past Due | 30,583,000 |  | 30,583,000 |  |  |  | 145,000
Loans with Recourse | Serviced Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Repurchased Loans | 131,000,000 | 15,000,000 | 143,000,000 | 38,000,000 |  |  |
Loans with Recourse | Serviced Mortgage Loans | Bulk loan repurchase |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Repurchased Loans | 120,000,000 |  |  |  |  |  |
Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | 5,831,175,000 |  | 5,831,175,000 |  |  | 5,997,886,000
ASC Subtopic 310-30 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Outstanding principal balance of SOP loans |  |  |  |  |  |  | 1,900,000,000
Loans held-in-portfolio, net of unearned income |  |  |  |  |  |  | 153,000,000
Accruing loans past-due 90 days or more |  |  |  |  |  | $ 144,000,000 |
Current |  |  |  |  |  | 134,000,000 |
Puerto Rico |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 21,664,643,000 | 19,932,582,000 | 21,664,643,000 | 19,932,582,000 |  |  | 20,180,232,000
Current | 19,208,449,000 |  | 19,208,449,000 |  |  |  | 18,451,825,000
Unpaid principal balance |  |  |  |  |  |  | 1,200,673,000
Past Due | 2,456,194,000 |  | 2,456,194,000 |  |  |  | 1,728,407,000
Non-accrual with no allowance | 214,537,000 |  | 214,537,000 |  |  |  |
Puerto Rico | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 1,212,944,000 |  | 1,212,944,000 |  |  |  | 460,133,000
Past Due | 1,906,620,000 |  | 1,906,620,000 |  |  |  | 1,093,390,000
Puerto Rico | Mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 6,826,980,000 | 6,235,576,000 | 6,826,980,000 | 6,235,576,000 |  |  | 6,166,748,000
Current | 4,863,266,000 |  | 4,863,266,000 |  |  |  | 4,897,894,000
Unpaid principal balance |  |  |  |  |  |  | 614,267,000
Past Due | 1,963,714,000 |  | 1,963,714,000 |  |  |  | 1,268,854,000
Non-accrual with no allowance | 145,243,000 |  | 145,243,000 |  |  |  |
Puerto Rico | Mortgages | Past Due 90 Days or More |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 1,197,444,000 |  | 1,197,444,000 |  |  |  | 439,662,000
Past Due | 1,567,504,000 |  | 1,567,504,000 |  |  |  | 837,651,000
Puerto Rico | Reverse Mortgages |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Current | 60,000,000 |  | 60,000,000 |  |  |  | 65,000,000
Puerto Rico | Residential mortgage loans insured By FHA |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Accruing loans past-due 90 days or more | 318,000,000 |  | 318,000,000 |  |  |  | 213,000,000
Puerto Rico | Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income | 196,065,000 | 124,072,000 | 196,065,000 | 124,072,000 |  |  | 137,470,000
Current | 169,656,000 |  | 169,656,000 |  |  |  | 135,796,000
Unpaid principal balance |  |  |  |  |  |  | 119,000
Past Due | 26,409,000 |  | 26,409,000 |  |  |  | 1,674,000
Non-accrual with no allowance | 0 |  | 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 |  |  |  | 0
Past Due | $ 21,514,000 |  | $ 21,514,000 |  |  |  | 119,000
Puerto Rico | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  | $ 5,381,797,000 |  | $ 5,381,797,000 |  |  | 5,555,377,000
Puerto Rico | ASC Subtopic 310-30 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |  |  |
Loans held-in-portfolio, net of unearned income |  |  |  |  |  |  | $ 134,000,000
Accruing loans past-due 90 days or more |  |  |  |  |  | 125,000,000 |
Current |  |  |  |  |  | $ 134,000,000 |

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