Quantitative information by loan class for loans modified as T D R (Detail) (USD $) In Thousands, unless otherwise specified	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]
Modifications Number Of Contracts	920	1,653	2,842	5,378
Modifications, Pre-Modification Recorded Investment	$ 45,562	$ 141,455	$ 129,276	$ 370,177
Post Modification Recorded Investment	35,002	149,559	120,779	381,988
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	3,352	187	10,075	13,512
Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	5	4	10	12
Modifications, Pre-Modification Recorded Investment	4,832	8,781	8,902	18,519
Post Modification Recorded Investment	2,649	8,734	6,103	17,267
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	51	368	39	(422)
Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	16	7	53	28
Modifications, Pre-Modification Recorded Investment	13,486	3,872	29,079	11,565
Post Modification Recorded Investment	3,472	3,369	16,973	10,651
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(356)	(112)	(867)	(148)
Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	8	9	30	87
Modifications, Pre-Modification Recorded Investment	4,906	13,692	8,649	38,549
Post Modification Recorded Investment	4,896	3,873	8,680	28,306
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(138)	(6,596)	(156)	(6,352)
Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	7	0	10
Modifications, Pre-Modification Recorded Investment	0	5,025	0	7,695
Post Modification Recorded Investment	0	4,230	0	6,900
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(263)	0	(211)
Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	82	778	354	1,977
Modifications, Pre-Modification Recorded Investment	13,388	100,320	57,260	258,931
Post Modification Recorded Investment	14,104	118,677	61,044	281,293
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,820	6,073	6,197	18,283
Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	3
Modifications, Pre-Modification Recorded Investment	0	0	0	1,272
Post Modification Recorded Investment	0	0	0	1,267
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	(3)
Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	16	34	78
Modifications, Pre-Modification Recorded Investment	184	256	627	1,265
Post Modification Recorded Investment	178	241	607	1,208
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	58	29	191	132
Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	525	579	1,567	2,210
Modifications, Pre-Modification Recorded Investment	4,399	5,100	12,543	18,621
Post Modification Recorded Investment	5,255	6,000	15,050	21,347
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	905	20	1,660	64
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	2	0	3
Modifications, Pre-Modification Recorded Investment	0	281	0	431
Post Modification Recorded Investment	0	275	0	409
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	3	0	3
Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	253	235	725	926
Modifications, Pre-Modification Recorded Investment	4,251	4,054	11,893	13,132
Post Modification Recorded Investment	4,257	4,083	11,924	13,162
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	991	663	2,969	2,165
Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	8	2	10	5
Modifications, Pre-Modification Recorded Investment	64	20	102	68
Post Modification Recorded Investment	139	23	179	50
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	11	2	13	1
Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	14	14	59	39
Modifications, Pre-Modification Recorded Investment	52	54	221	129
Post Modification Recorded Investment	52	54	219	128
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10	0	29	0
PUERTO RICO
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	908	1,630	2,817	5,297
Modifications, Pre-Modification Recorded Investment	42,823	133,195	122,406	347,722
Post Modification Recorded Investment	32,300	141,790	114,118	360,284
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	3,149	(8)	9,812	12,301
PUERTO RICO | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
PUERTO RICO | Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	4	2	5	8
Modifications, Pre-Modification Recorded Investment	3,433	4,813	4,681	8,754
Post Modification Recorded Investment	1,373	4,813	2,114	7,810
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	51	368	41	(606)
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	16	6	52	27
Modifications, Pre-Modification Recorded Investment	13,486	1,626	28,698	9,319
Post Modification Recorded Investment	3,472	1,619	16,686	8,901
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(356)	(6)	(857)	(42)
PUERTO RICO | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	8	9	30	87
Modifications, Pre-Modification Recorded Investment	4,906	13,692	8,649	38,549
Post Modification Recorded Investment	4,896	3,873	8,680	28,306
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(138)	(6,596)	(156)	(6,352)
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	7	0	9
Modifications, Pre-Modification Recorded Investment	0	5,025	0	6,122
Post Modification Recorded Investment	0	4,230	0	5,327
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(263)	0	(211)
PUERTO RICO | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	71	760	335	1,908
Modifications, Pre-Modification Recorded Investment	12,048	98,555	54,992	251,763
Post Modification Recorded Investment	12,678	116,854	58,659	274,045
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,617	5,775	5,922	17,150
PUERTO RICO | Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	16	34	78
Modifications, Pre-Modification Recorded Investment	184	256	627	1,265
Post Modification Recorded Investment	178	241	607	1,208
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	58	29	191	132
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	525	579	1,567	2,210
Modifications, Pre-Modification Recorded Investment	4,399	5,100	12,543	18,621
Post Modification Recorded Investment	5,255	6,000	15,050	21,347
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	905	20	1,660	64
PUERTO RICO | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
PUERTO RICO | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	253	235	725	926
Modifications, Pre-Modification Recorded Investment	4,251	4,054	11,893	13,132
Post Modification Recorded Investment	4,257	4,083	11,924	13,162
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	991	663	2,969	2,165
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	8	2	10	5
Modifications, Pre-Modification Recorded Investment	64	20	102	68
Post Modification Recorded Investment	139	23	179	50
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	11	2	13	1
PUERTO RICO | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	14	14	59	39
Modifications, Pre-Modification Recorded Investment	52	54	221	129
Post Modification Recorded Investment	52	54	219	128
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	10	0	29	0
UNITED STATES
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	12	23	25	81
Modifications, Pre-Modification Recorded Investment	2,739	8,260	6,870	22,455
Post Modification Recorded Investment	2,702	7,769	6,661	21,704
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	203	195	263	1,211
UNITED STATES | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	1	2	5	4
Modifications, Pre-Modification Recorded Investment	1,399	3,968	4,221	9,765
Post Modification Recorded Investment	1,276	3,921	3,989	9,457
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	(2)	184
UNITED STATES | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	1	1	1
Modifications, Pre-Modification Recorded Investment	0	2,246	381	2,246
Post Modification Recorded Investment	0	1,750	287	1,750
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(106)	(10)	(106)
UNITED STATES | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	1
Modifications, Pre-Modification Recorded Investment	0	0	0	1,573
Post Modification Recorded Investment	0	0	0	1,573
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	11	18	19	69
Modifications, Pre-Modification Recorded Investment	1,340	1,765	2,268	7,168
Post Modification Recorded Investment	1,426	1,823	2,385	7,248
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	203	298	275	1,133
UNITED STATES | Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	3
Modifications, Pre-Modification Recorded Investment	0	0	0	1,272
Post Modification Recorded Investment	0	0	0	1,267
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	(3)
UNITED STATES | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	2	0	3
Modifications, Pre-Modification Recorded Investment	0	281	0	431
Post Modification Recorded Investment	0	275	0	409
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	3	0	3
UNITED STATES | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	0
UNITED STATES | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	0
Modifications, Pre-Modification Recorded Investment	0	0	0	0
Post Modification Recorded Investment	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0