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, 2014 loans	Sep. 30, 2013 loans	Sep. 30, 2014 loans	Sep. 30, 2013 loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	921	920	2,760	2,842
Modifications, Pre-Modification Recorded Investment	$ 138,790	$ 45,562	$ 292,457	$ 129,276
Post Modification Recorded Investment	139,212	35,002	294,401	120,779
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9,420	3,352	15,787	10,075
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	6	5	12	10
Modifications, Pre-Modification Recorded Investment	14,641	4,832	17,503	8,902
Post Modification Recorded Investment	14,668	2,649	17,583	6,103
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(942)	51	(864)	39
Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	16	31	53
Modifications, Pre-Modification Recorded Investment	10,209	13,486	43,467	29,079
Post Modification Recorded Investment	10,366	3,472	43,176	16,973
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	91	(356)	1,511	(867)
Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	33	8	62	30
Modifications, Pre-Modification Recorded Investment	81,470	4,906	123,661	8,649
Post Modification Recorded Investment	81,731	4,896	123,706	8,680
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	6,730	(138)	6,799	(156)
Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	3	0
Modifications, Pre-Modification Recorded Investment	0	0	11,358	0
Post Modification Recorded Investment	0	0	11,358	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	(570)	0
Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	133	82	454	354
Modifications, Pre-Modification Recorded Investment	23,031	13,388	70,636	57,260
Post Modification Recorded Investment	22,423	14,104	71,186	61,044
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,584	1,820	3,766	6,197
Legacy [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
Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	18	9	47	34
Modifications, Pre-Modification Recorded Investment	440	184	1,153	627
Post Modification Recorded Investment	439	178	1,156	607
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	88	58	254	191
Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	403	525	1,277	1,567
Modifications, Pre-Modification Recorded Investment	3,522	4,399	10,474	12,543
Post Modification Recorded Investment	4,080	5,255	11,982	15,050
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	679	905	1,908	1,660
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	5	0	5	0
Modifications, Pre-Modification Recorded Investment	251	0	251	0
Post Modification Recorded Investment	250	0	250	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	67	0	67	0
Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	271	253	770	725
Modifications, Pre-Modification Recorded Investment	5,035	4,251	13,484	11,893
Post Modification Recorded Investment	5,064	4,257	13,529	11,924
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,093	991	2,859	2,969
Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	3	8	14	10
Modifications, Pre-Modification Recorded Investment	39	64	215	102
Post Modification Recorded Investment	43	139	225	179
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	11	12	13
Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	40	14	85	59
Modifications, Pre-Modification Recorded Investment	152	52	255	221
Post Modification Recorded Investment	148	52	250	219
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	28	10	45	29
PUERTO RICO
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	912	908	2,740	2,817
Modifications, Pre-Modification Recorded Investment	138,189	42,823	290,288	122,406
Post Modification Recorded Investment	138,609	32,300	291,971	114,118
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9,256	3,149	15,383	9,812
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	6	4	12	5
Modifications, Pre-Modification Recorded Investment	14,641	3,433	17,503	4,681
Post Modification Recorded Investment	14,668	1,373	17,583	2,114
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(942)	51	(864)	41
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	16	31	52
Modifications, Pre-Modification Recorded Investment	10,209	13,486	43,467	28,698
Post Modification Recorded Investment	10,366	3,472	43,176	16,686
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	91	(356)	1,511	(857)
PUERTO RICO | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	33	8	62	30
Modifications, Pre-Modification Recorded Investment	81,470	4,906	123,661	8,649
Post Modification Recorded Investment	81,731	4,896	123,706	8,680
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	6,730	(138)	6,799	(156)
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0	3	0
Modifications, Pre-Modification Recorded Investment	0	0	11,358	0
Post Modification Recorded Investment	0	0	11,358	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	(570)	0
PUERTO RICO | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	129	71	439	335
Modifications, Pre-Modification Recorded Investment	22,681	12,048	68,718	54,992
Post Modification Recorded Investment	22,070	12,678	69,006	58,659
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,487	1,617	3,429	5,922
PUERTO RICO | Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	18	9	47	34
Modifications, Pre-Modification Recorded Investment	440	184	1,153	627
Post Modification Recorded Investment	439	178	1,156	607
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	88	58	254	191
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	403	525	1,277	1,567
Modifications, Pre-Modification Recorded Investment	3,522	4,399	10,474	12,543
Post Modification Recorded Investment	4,080	5,255	11,982	15,050
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	679	905	1,908	1,660
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	271	253	770	725
Modifications, Pre-Modification Recorded Investment	5,035	4,251	13,484	11,893
Post Modification Recorded Investment	5,064	4,257	13,529	11,924
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,093	991	2,859	2,969
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	3	8	14	10
Modifications, Pre-Modification Recorded Investment	39	64	215	102
Post Modification Recorded Investment	43	139	225	179
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	11	12	13
PUERTO RICO | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	40	14	85	59
Modifications, Pre-Modification Recorded Investment	152	52	255	221
Post Modification Recorded Investment	148	52	250	219
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	28	10	45	29
UNITED STATES
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	12	20	25
Modifications, Pre-Modification Recorded Investment	601	2,739	2,169	6,870
Post Modification Recorded Investment	603	2,702	2,430	6,661
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	164	203	404	263
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	0	1	0	5
Modifications, Pre-Modification Recorded Investment	0	1,399	0	4,221
Post Modification Recorded Investment	0	1,276	0	3,989
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	(2)
UNITED STATES | Commercial Real Estate Owner Occupied [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	381
Post Modification Recorded Investment	0	0	0	287
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0	0	(10)
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	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 | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	4	11	15	19
Modifications, Pre-Modification Recorded Investment	350	1,340	1,918	2,268
Post Modification Recorded Investment	353	1,426	2,180	2,385
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	97	203	337	275
UNITED STATES | Legacy [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 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	5	0	5	0
Modifications, Pre-Modification Recorded Investment	251	0	251	0
Post Modification Recorded Investment	250	0	250	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	67	0	67	0
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