Troubled debt restructurings loan count by type of modification (Detail)	3 Months Ended
	Mar. 31, 2014 loans	Mar. 31, 2013 loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	541	546
Extension of Maturity Date	43	37
Combination Interest Rate Reduction Maturity Date Extension	92	142
Other Modifications	181	242
Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	2	0
Extension of Maturity Date	1	3
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	9	1
Extension of Maturity Date	2	1
Combination Interest Rate Reduction Maturity Date Extension	0	1
Other Modifications	0	0
Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	9	2
Extension of Maturity Date	0	2
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	3	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	13	4
Extension of Maturity Date	14	13
Combination Interest Rate Reduction Maturity Date Extension	86	133
Other Modifications	24	6
Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	4	10
Combination Interest Rate Reduction Maturity Date Extension	6	8
Other Modifications	0	0
Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	274	288
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	155	236
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	216	232
Extension of Maturity Date	17	8
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	1	0
Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	2	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	18	19
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	1	0
PUERTO RICO
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	541	546
Extension of Maturity Date	43	35
Combination Interest Rate Reduction Maturity Date Extension	86	138
Other Modifications	181	242
PUERTO RICO | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	2	0
Extension of Maturity Date	1	1
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	9	1
Extension of Maturity Date	2	1
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	9	2
Extension of Maturity Date	0	2
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	3	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	13	4
Extension of Maturity Date	14	13
Combination Interest Rate Reduction Maturity Date Extension	80	130
Other Modifications	24	6
PUERTO RICO | Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	4	10
Combination Interest Rate Reduction Maturity Date Extension	6	8
Other Modifications	0	0
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	274	288
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	155	236
PUERTO RICO | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	216	232
Extension of Maturity Date	17	8
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	1	0
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	2	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
PUERTO RICO | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	18	19
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	1	0
UNITED STATES
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	2
Combination Interest Rate Reduction Maturity Date Extension	6	4
Other Modifications	0	0
UNITED STATES | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	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
Extension of Maturity Date	0	2
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	1
Other Modifications	0	0
UNITED STATES | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	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
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	6	3
Other Modifications	0	0
UNITED STATES | Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0
UNITED STATES | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Reduction In Interest Rate	0	0
Extension of Maturity Date	0	0
Combination Interest Rate Reduction Maturity Date Extension	0	0
Other Modifications	0	0