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Troubled debt restructurings loan count by type of modification (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
loans
Sep. 30, 2012
loans
Sep. 30, 2013
loans
Sep. 30, 2012
loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 517 841 1,598 2,695
Extension of Maturity Date 29 80 92 291
Combination Interest Rate Reduction Maturity Date Extension 76 424 315 1,297
Other Modifications 298 309 837 1,097
Commercial Multi Family [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
Commercial Real Estate Non Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 3 2 3 6
Extension of Maturity Date 1 2 4 6
Combination Interest Rate Reduction Maturity Date Extension 1 0 3 0
Other Modifications 0 0 0 1
Commercial Real Estate Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 2 1 4 7
Extension of Maturity Date 2 5 3 20
Combination Interest Rate Reduction Maturity Date Extension 0 0 1 0
Other Modifications 12 1 45 1
Commercial And Industrial Loans [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 3 1 13 27
Extension of Maturity Date 3 8 7 61
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 2 0 10 0
Commercial Real Estate Construction Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 7 0 8
Extension of Maturity Date 0 0 0 1
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 1
Mortgages [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 4 273 13 437
Extension of Maturity Date 5 43 32 126
Combination Interest Rate Reduction Maturity Date Extension 72 422 295 1,264
Other Modifications 1 40 14 150
Legacy [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 1
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 2
Finance Leases Portfolio Segment Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 6 16 18 49
Combination Interest Rate Reduction Maturity Date Extension 3 0 16 28
Other Modifications 0 0 0 0
Consumer Credit Card Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 246 311 806 1,268
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 279 268 761 942
Home Equity Line of Credit [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 1 0 1
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 1 0 2
Other Modifications 0 0 0 0
Personal [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 248 231 703 901
Extension of Maturity Date 4 4 18 25
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 1 0 4 0
Consumer Loans Auto Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 8 2 10 3
Combination Interest Rate Reduction Maturity Date Extension 0 1 0 3
Other Modifications 0 0 0 0
Consumer Other Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 11 14 56 39
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 3 0 3 0
PUERTO RICO
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 517 839 1,598 2,688
Extension of Maturity Date 29 77 90 288
Combination Interest Rate Reduction Maturity Date Extension 64 407 292 1,231
Other Modifications 298 308 837 1,092
PUERTO RICO | Commercial Multi Family [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
PUERTO RICO | Commercial Real Estate Non Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 3 2 3 5
Extension of Maturity Date 1 0 2 4
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 2 1 4 7
Extension of Maturity Date 2 5 3 20
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 12 0 45 0
PUERTO RICO | Commercial And Industrial Loans [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 3 1 13 27
Extension of Maturity Date 3 8 7 61
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 2 0 10 0
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 7 0 8
Extension of Maturity Date 0 0 0 1
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
PUERTO RICO | Mortgages [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 4 272 13 433
Extension of Maturity Date 5 42 32 125
Combination Interest Rate Reduction Maturity Date Extension 61 406 276 1,200
Other Modifications 1 40 14 150
PUERTO RICO | Finance Leases Portfolio Segment Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 6 16 18 49
Combination Interest Rate Reduction Maturity Date Extension 3 0 16 28
Other Modifications 0 0 0 0
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 246 311 806 1,268
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 279 268 761 942
PUERTO RICO | Home Equity Line of Credit [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
PUERTO RICO | Personal [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 248 231 703 901
Extension of Maturity Date 4 4 18 25
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 1 0 4 0
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 8 2 10 3
Combination Interest Rate Reduction Maturity Date Extension 0 1 0 3
Other Modifications 0 0 0 0
PUERTO RICO | Consumer Other Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 11 14 56 39
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 3 0 3 0
UNITED STATES
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 2 0 7
Extension of Maturity Date 0 3 2 3
Combination Interest Rate Reduction Maturity Date Extension 12 17 23 66
Other Modifications 0 1 0 5
UNITED STATES | Commercial Multi Family [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
UNITED STATES | Commercial Real Estate Non Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 1
Extension of Maturity Date 0 2 2 2
Combination Interest Rate Reduction Maturity Date Extension 1 0 3 0
Other Modifications 0 0 0 1
UNITED STATES | Commercial Real Estate Owner Occupied [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 1 0
Other Modifications 0 1 0 1
UNITED STATES | Commercial And Industrial Loans [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
UNITED STATES | Commercial Real Estate Construction Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 1
UNITED STATES | Mortgages [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 1 0 4
Extension of Maturity Date 0 1 0 1
Combination Interest Rate Reduction Maturity Date Extension 11 16 19 64
Other Modifications 0 0 0 0
UNITED STATES | Legacy [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 1
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 2
UNITED STATES | Consumer Credit Card Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
UNITED STATES | Home Equity Line of Credit [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 1 0 1
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 1 0 2
Other Modifications 0 0 0 0
UNITED STATES | Personal [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
UNITED STATES | Consumer Loans Auto Financing Receivable [Member]
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0
UNITED STATES | Consumer Other Financing Receivable Member
        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Reduction In Interest Rate 0 0 0 0
Extension of Maturity Date 0 0 0 0
Combination Interest Rate Reduction Maturity Date Extension 0 0 0 0
Other Modifications 0 0 0 0