Quantitative information by loan class for loans modified as T D R (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 loans	Jun. 30, 2012 loans	Jun. 30, 2013 loans	Jun. 30, 2012 loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	955	1,846	1,922	3,725
Modifications, Pre-Modification Recorded Investment	$ 42,168	$ 130,530	$ 83,714	$ 227,377
Post Modification Recorded Investment	42,071	133,884	85,777	232,523
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2,503	3,945	6,723	8,934
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	2	2	5	8
Modifications, Pre-Modification Recorded Investment	1,228	2,390	4,070	8,486
Post Modification Recorded Investment	1,154	2,525	3,454	8,626
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	188	(12)	(785)
Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	34	11	37	21
Modifications, Pre-Modification Recorded Investment	10,646	4,481	15,593	7,693
Post Modification Recorded Investment	8,628	4,070	13,501	7,282
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(161)	1	(511)	(38)
Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	18	30	22	78
Modifications, Pre-Modification Recorded Investment	3,583	18,392	3,743	24,764
Post Modification Recorded Investment	3,623	18,061	3,784	24,434
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(17)	229	(18)	250
Commercial Real Estate Construction Financing Receivable 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	2,670
Post Modification Recorded Investment	0	0	0	2,670
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	52
Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	116	715	272	1,199
Modifications, Pre-Modification Recorded Investment	18,748	93,674	43,872	158,611
Post Modification Recorded Investment	19,923	96,995	46,940	162,616
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	927	2,692	4,377	7,812
Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	1	0	3
Modifications, Pre-Modification Recorded Investment	0	321	0	1,272
Post Modification Recorded Investment	0	316	0	1,267
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(3)	0	(3)
Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	7	34	25	62
Modifications, Pre-Modification Recorded Investment	116	499	443	1,009
Post Modification Recorded Investment	114	481	429	966
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	30	53	133	103
Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	518	744	1,042	1,631
Modifications, Pre-Modification Recorded Investment	3,879	6,296	8,144	13,521
Post Modification Recorded Investment	4,649	6,981	9,795	15,347
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	718	4	755	44
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	1	0	1
Modifications, Pre-Modification Recorded Investment	0	150	0	150
Post Modification Recorded Investment	0	134	0	134
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(1)	0	(1)
Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	232	293	472	691
Modifications, Pre-Modification Recorded Investment	3,810	4,290	7,642	9,079
Post Modification Recorded Investment	3,821	4,285	7,667	9,080
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	985	782	1,978	1,501
Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	2	1	2	3
Modifications, Pre-Modification Recorded Investment	38	3	38	47
Post Modification Recorded Investment	40	3	40	27
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	0	2	(1)
Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	26	14	45	25
Modifications, Pre-Modification Recorded Investment	120	34	169	75
Post Modification Recorded Investment	119	33	167	74
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	19	0	19	0
PUERTO RICO
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	948	1,819	1,909	3,667
Modifications, Pre-Modification Recorded Investment	40,238	125,425	79,583	213,183
Post Modification Recorded Investment	40,186	129,129	81,818	218,588
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2,454	3,408	6,663	7,920
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	0	1	1	6
Modifications, Pre-Modification Recorded Investment	0	138	1,248	2,690
Post Modification Recorded Investment	0	534	741	3,090
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	4	(10)	(969)
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	34	11	36	21
Modifications, Pre-Modification Recorded Investment	10,646	4,481	15,212	7,693
Post Modification Recorded Investment	8,628	4,070	13,214	7,282
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(161)	1	(501)	(38)
PUERTO RICO | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	18	30	22	78
Modifications, Pre-Modification Recorded Investment	3,583	18,392	3,743	24,764
Post Modification Recorded Investment	3,623	18,061	3,784	24,434
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(17)	229	(18)	250
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	0	2
Modifications, Pre-Modification Recorded Investment	0	0	0	1,097
Post Modification Recorded Investment	0	0	0	1,097
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	52
PUERTO RICO | Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	111	691	264	1,148
Modifications, Pre-Modification Recorded Investment	18,046	91,292	42,944	153,208
Post Modification Recorded Investment	19,192	94,681	45,981	157,191
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	878	2,335	4,305	6,978
PUERTO RICO | Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	7	34	25	62
Modifications, Pre-Modification Recorded Investment	116	499	443	1,009
Post Modification Recorded Investment	114	481	429	966
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	30	53	133	103
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	518	744	1,042	1,631
Modifications, Pre-Modification Recorded Investment	3,879	6,296	8,144	13,521
Post Modification Recorded Investment	4,649	6,981	9,795	15,347
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	718	4	755	44
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	232	293	472	691
Modifications, Pre-Modification Recorded Investment	3,810	4,290	7,642	9,079
Post Modification Recorded Investment	3,821	4,285	7,667	9,080
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	985	782	1,978	1,501
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	2	1	2	3
Modifications, Pre-Modification Recorded Investment	38	3	38	47
Post Modification Recorded Investment	40	3	40	27
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	0	2	(1)
PUERTO RICO | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	26	14	45	25
Modifications, Pre-Modification Recorded Investment	120	34	169	75
Post Modification Recorded Investment	119	33	167	74
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	19	0	19	0
UNITED STATES
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	7	27	13	58
Modifications, Pre-Modification Recorded Investment	1,930	5,105	4,131	14,194
Post Modification Recorded Investment	1,885	4,755	3,959	13,935
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	49	537	60	1,014
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	2	1	4	2
Modifications, Pre-Modification Recorded Investment	1,228	2,252	2,822	5,796
Post Modification Recorded Investment	1,154	1,991	2,713	5,536
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	184	(2)	184
UNITED STATES | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	1	0
Modifications, Pre-Modification Recorded Investment	0	0	381	0
Post Modification Recorded Investment	0	0	287	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	(10)	0
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
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	5	24	8	51
Modifications, Pre-Modification Recorded Investment	702	2,382	928	5,403
Post Modification Recorded Investment	731	2,314	959	5,425
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	49	357	72	834
UNITED STATES | Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	1	0	3
Modifications, Pre-Modification Recorded Investment	0	321	0	1,272
Post Modification Recorded Investment	0	316	0	1,267
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(3)	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	1	0	1
Modifications, Pre-Modification Recorded Investment	0	150	0	150
Post Modification Recorded Investment	0	134	0	134
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	(1)	0	(1)
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