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Loans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income recognized $ 4,000 $ 4,000
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 38,332 305,597
Loans held in portfolio, net of unearned income 35,064,971 32,077,769
Non-accrual with no allowance 125,958 177,104
Accumulated loans modified to borrowers under financial difficulties   1,644,647
Trading account debt securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 37,345 300,279
Accruing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accumulated loans modified to borrowers under financial difficulties   1,495,309
Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 341,279 406,836
Non-accrual with no allowance 126,000 177,000
Past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 1,348,071 1,294,617
Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 268,471 351,614
Loans held in portfolio, net of unearned income 626,082 791,055
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 33,716,900 30,783,152
GNMA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Repurchased loans 44,000 58,000
GNMA | Trading account debt securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 2,488 169,352
FNMA | Trading account debt securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 34,857 122,422
FHLMC | Trading account debt securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds   8,505
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans 127,000 433,000
Loans Sold 45,000  
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans Sold 49,000 63,000
Commercial Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans 266,000 142,000
Purchased credit deterioration loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans 1,000 4,000
Commercial and construction loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Sold 82,000 138,000
Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchase of Loans 385,000 299,000
Loans held in portfolio, net of unearned income 7,695,917 7,397,471
Non-accrual with no allowance 84,797 119,098
Accumulated loans modified to borrowers under financial difficulties   1,256,766
Mortgages | Accruing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accumulated loans modified to borrowers under financial difficulties   1,169,976
Mortgages | Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 86,416 129,173
Mortgages | Past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 859,537 937,253
Mortgages | Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 241,422 337,602
Loans held in portfolio, net of unearned income 427,719 600,481
Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 6,836,380 6,460,218
Mortgages | US Government Agency Insured Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 2,200,000 2,000,000
Mortgages | US Government Agency Insured Loans | Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 241,600 337,800
Mortgages | Guaranteed by U.S. sponsored entities | Accruing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accumulated loans modified to borrowers under financial difficulties   725,000
Mortgages | GNMA | Buy Back Option Program | Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 11,000 14,000
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 38,000 42,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 106,000 190,000
Puerto Rico    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 24,510,923 22,546,905
Non-accrual with no allowance 121,961 170,484
Puerto Rico | Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 329,604 399,047
Puerto Rico | Past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 1,204,964 1,213,179
Puerto Rico | Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 268,362 351,248
Loans held in portfolio, net of unearned income 597,080 753,257
Puerto Rico | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 23,305,959 21,333,726
Puerto Rico | Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 6,391,824 6,110,279
Non-accrual with no allowance 84,677 119,027
Puerto Rico | Mortgages | Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 85,113 128,069
Puerto Rico | Mortgages | Past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 791,707 894,800
Puerto Rico | Mortgages | Past due 90 days or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 241,422 337,602
Loans held in portfolio, net of unearned income 416,528 579,993
Puerto Rico | Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 5,600,117 5,215,479
Puerto Rico | Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio, net of unearned income 38,000 42,000
Puerto Rico | Residential mortgage loans insured By FHA | Past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance $ 106,000 $ 190,000