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Loans - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 15, 2021 | Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Interest income recognized |  | $ 3,000 | $ 4,000 |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 743,847 | 515,307 |  |
Financing Receivable Modifications Recorded Investment |  | 1,656,822 | 1,668,368 |  |
Loans held in portfolio, net of unearned income |  | 29,240,557 | 29,385,196 |  |
Non-accrual with no allowance |  | 236,858 | 203,460 |  |
K2 Capital Group LLC |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Commercial loans |  |  |  | $ 115,575 |
K2 Capital Group LLC | Book value |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Commercial loans |  |  |  | 118,907 |
Direct financing leases | K2 Capital Group LLC | Book value |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Commercial loans |  |  |  | 105,000 |
Working capital | K2 Capital Group LLC | Book value |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Commercial loans |  |  |  | $ 14,000 |
Trading account debt securities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 732,533 | 508,071 |  |
Accruing |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Financing Receivable Modifications Recorded Investment |  | 1,468,966 | 1,394,538 |  |
Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 497,988 | 634,621 |  |
Past due |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 1,491,093 | 2,269,553 |  |
Past due 90 days or more |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 480,767 | 1,028,064 |  |
Loans held in portfolio, net of unearned income |  | 1,028,644 | 1,765,838 |  |
Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 27,749,464 | 27,115,643 |  |
Buy Back Option Program |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased loans |  | 94,000 | 862,000 |  |
GNMA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 380,000 | 332,000 |  |
GNMA | Trading account debt securities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 380,228 | 332,207 |  |
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 | $ 687,900 |  | 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 |  | 330,000 | 176,000 |  |
FNMA | Trading account debt securities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 329,617 | 175,864 |  |
FHLMC |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 23,000 |  |  |
FHLMC | Trading account debt securities |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds |  | 22,688 |  |  |
Consumer loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 61,000 | 56,000 |  |
Residential Mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 393,000 | 1,300,000 |  |
Mortgage Loans Sold |  | 145,000 | 150,000 |  |
Purchased credit deterioration loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 14,000 | 160,000 |  |
Serviced mortgage loans | Loans with recourse |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased loans |  | 19,000 | 161,000 |  |
Serviced mortgage loans | Bulk loan repurchase | Loans with recourse |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Repurchased loans |  |  | 120,000 |  |
Mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Financing Receivable Modifications Recorded Investment |  | 1,255,713 | 1,195,965 |  |
Loans held in portfolio, net of unearned income |  | 7,427,196 | 7,890,680 |  |
Non-accrual with no allowance |  | 169,856 | 142,254 |  |
Mortgages | Accruing |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Financing Receivable Modifications Recorded Investment |  | 1,143,204 | 1,060,193 |  |
Mortgages | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 180,700 | 182,503 |  |
Mortgages | Past due |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 1,141,082 | 1,775,902 |  |
Mortgages | Past due 90 days or more |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 471,358 | 1,014,481 |  |
Loans held in portfolio, net of unearned income |  | 827,214 | 1,443,688 |  |
Mortgages | Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 6,286,114 | 6,114,778 |  |
Mortgages | US Government Agency Insured Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 1,900,000 | 2,100,000 |  |
Mortgages | US Government Agency Insured Loans | Past due 90 days or more |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 500,000 | 1,000,000 |  |
Mortgages | Guaranteed by us sponsored entities | Accruing |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Financing Receivable Modifications Recorded Investment |  | 716,000 | 655,000 |  |
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 |  | 13,000 | 57,000 |  |
Commercial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Purchase of Loans |  | 139,000 | 26,000 |  |
Loans Sold |  |  | 32,000 |  |
Reverse Mortgages | Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 50,000 | 60,000 |  |
Commercial and construction loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans Sold |  | 131,000 |  |  |
Puerto Rico |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 20,865,382 | 21,573,280 |  |
Non-accrual with no allowance |  | 236,748 | 202,943 |  |
Puerto Rico | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 497,062 | 622,906 |  |
Puerto Rico | Past due |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 1,418,146 | 2,146,682 |  |
Puerto Rico | Past due 90 days or more |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 480,649 | 1,028,061 |  |
Loans held in portfolio, net of unearned income |  | 994,938 | 1,728,438 |  |
Puerto Rico | Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 19,447,236 | 19,426,598 |  |
Puerto Rico | Mortgages |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 6,251,866 | 6,770,143 |  |
Non-accrual with no allowance |  | 169,827 | 141,737 |  |
Puerto Rico | Mortgages | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 179,774 | 181,648 |  |
Puerto Rico | Mortgages | Past due |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 1,104,829 | 1,712,152 |  |
Puerto Rico | Mortgages | Past due 90 days or more |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | 471,358 | 1,014,481 |  |
Loans held in portfolio, net of unearned income |  | 805,245 | 1,428,824 |  |
Puerto Rico | Mortgages | Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 5,147,037 | 5,057,991 |  |
Puerto Rico | 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 |  |
Puerto Rico | Reverse Mortgages | Current |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Loans held in portfolio, net of unearned income |  | 50,000 | 60,000 |  |
Puerto Rico | Residential mortgage loans insured By FHA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable |  |  |  |  |
Accruing loans past-due 90 days or more |  | $ 304,000 | $ 329,000 |  |

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