Quantitative information by loan class for loans modified as T D R (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loans	Mar. 31, 2014 loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	861	857
Modifications, Pre-Modification Recorded Investment	$ 53,953	$ 43,380
Post Modification Recorded Investment	56,543	45,230
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	6,329	2,092
Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	2	0
Modifications, Pre-Modification Recorded Investment	551	0
Post Modification Recorded Investment	551	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	0
Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	3	3
Modifications, Pre-Modification Recorded Investment	18,000	1,376
Post Modification Recorded Investment	17,998	1,454
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2,986	(63)
Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	5	11
Modifications, Pre-Modification Recorded Investment	4,759	1,629
Post Modification Recorded Investment	4,552	1,617
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	171	(26)
Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	10	9
Modifications, Pre-Modification Recorded Investment	5,534	773
Post Modification Recorded Investment	5,889	770
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	224	9
Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	1	3
Modifications, Pre-Modification Recorded Investment	268	11,358
Post Modification Recorded Investment	259	11,358
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(166)	(570)
Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	154	137
Modifications, Pre-Modification Recorded Investment	16,370	20,311
Post Modification Recorded Investment	18,231	21,589
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,421	1,133
Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	13	10
Modifications, Pre-Modification Recorded Investment	323	206
Post Modification Recorded Investment	325	207
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	73	63
Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	415	429
Modifications, Pre-Modification Recorded Investment	3,617	3,583
Post Modification Recorded Investment	4,066	4,091
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	629	627
Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	1	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	92	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9	0
Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	242	234
Modifications, Pre-Modification Recorded Investment	4,502	4,075
Post Modification Recorded Investment	4,500	4,074
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	967	912
Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	4	2
Modifications, Pre-Modification Recorded Investment	0	32
Post Modification Recorded Investment	51	33
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	8	1
Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	11	19
Modifications, Pre-Modification Recorded Investment	29	37
Post Modification Recorded Investment	29	37
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	5	6
PUERTO RICO
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	851	851
Modifications, Pre-Modification Recorded Investment	53,485	42,455
Post Modification Recorded Investment	54,986	44,166
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	6,238	2,097
PUERTO RICO | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	2	0
Modifications, Pre-Modification Recorded Investment	551	0
Post Modification Recorded Investment	551	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2	0
PUERTO RICO | Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	3	3
Modifications, Pre-Modification Recorded Investment	18,000	1,376
Post Modification Recorded Investment	17,998	1,454
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	2,986	(63)
PUERTO RICO | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	5	11
Modifications, Pre-Modification Recorded Investment	4,759	1,629
Post Modification Recorded Investment	4,552	1,617
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	171	(26)
PUERTO RICO | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	10	9
Modifications, Pre-Modification Recorded Investment	5,534	773
Post Modification Recorded Investment	5,889	770
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	224	9
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	1	3
Modifications, Pre-Modification Recorded Investment	268	11,358
Post Modification Recorded Investment	259	11,358
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	(166)	(570)
PUERTO RICO | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	145	131
Modifications, Pre-Modification Recorded Investment	15,902	19,386
Post Modification Recorded Investment	16,766	20,525
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	1,339	1,138
PUERTO RICO | Finance Leases Portfolio Segment Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	13	10
Modifications, Pre-Modification Recorded Investment	323	206
Post Modification Recorded Investment	325	207
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	73	63
PUERTO RICO | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	415	429
Modifications, Pre-Modification Recorded Investment	3,617	3,583
Post Modification Recorded Investment	4,066	4,091
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	629	627
PUERTO RICO | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
PUERTO RICO | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	242	234
Modifications, Pre-Modification Recorded Investment	4,502	4,075
Post Modification Recorded Investment	4,500	4,074
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	967	912
PUERTO RICO | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	4	2
Modifications, Pre-Modification Recorded Investment	0	32
Post Modification Recorded Investment	51	33
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	8	1
PUERTO RICO | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	11	19
Modifications, Pre-Modification Recorded Investment	29	37
Post Modification Recorded Investment	29	37
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	5	6
UNITED STATES
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	10	6
Modifications, Pre-Modification Recorded Investment	468	925
Post Modification Recorded Investment	1,557	1,064
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	91	(5)
UNITED STATES | Commercial Multi Family [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Commercial Real Estate Non Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Commercial Real Estate Owner Occupied [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Commercial And Industrial Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	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
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	9	6
Modifications, Pre-Modification Recorded Investment	468	925
Post Modification Recorded Investment	1,465	1,064
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	82	(5)
UNITED STATES | Legacy [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Consumer Credit Card Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Home Equity Line of Credit [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	1	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	92	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	9	0
UNITED STATES | Personal [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Consumer Loans Auto Financing Receivable [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
UNITED STATES | Consumer Other Financing Receivable Member
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Modifications Number Of Contracts	0	0
Modifications, Pre-Modification Recorded Investment	0	0
Post Modification Recorded Investment	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0