Note Allowance for loan losses (T D R that subsequently defaulted) (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) loans	Jun. 30, 2015 USD ($) loans	Jun. 30, 2016 USD ($) loans	Jun. 30, 2015 USD ($) loans
Troubled Debt Restructuring
Loan count | loans	153	223	335	432
Recorded investment as of first default date | $	$ 6,928	$ 7,741	$ 14,918	$ 20,835
Commercial multi-family
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
CRE non-owner occupied
Troubled Debt Restructuring
Loan count | loans	0	0	2	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 327	$ 0
CRE owner occupied
Troubled Debt Restructuring
Loan count | loans	1	0	7	1
Recorded investment as of first default date | $	$ 47	$ 0	$ 2,503	$ 291
Commercial and industrial
Troubled Debt Restructuring
Loan count | loans	2	1	2	2
Recorded investment as of first default date | $	$ 27	$ 64	$ 27	$ 154
Construction
Troubled Debt Restructuring
Loan count | loans	0	0	0	2
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 1,192
Mortgages
Troubled Debt Restructuring
Loan count | loans	55	48	82	126
Recorded investment as of first default date | $	$ 5,501	$ 5,941	$ 8,734	$ 16,042
Legacy
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
Leasing
Troubled Debt Restructuring
Loan count | loans	1	4	5	5
Recorded investment as of first default date | $	$ 32	$ 36	$ 63	$ 43
Credit cards
Troubled Debt Restructuring
Loan count | loans	56	138	171	240
Recorded investment as of first default date | $	$ 594	$ 1,225	$ 1,758	$ 2,341
Home equity lines of credit
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
Personal
Troubled Debt Restructuring
Loan count | loans	37	31	64	50
Recorded investment as of first default date | $	$ 711	$ 474	$ 1,473	$ 692
Auto
Troubled Debt Restructuring
Loan count | loans	1	0	2	4
Recorded investment as of first default date | $	$ 16	$ 0	$ 33	$ 78
Other
Troubled Debt Restructuring
Loan count | loans	0	1	0	2
Recorded investment as of first default date | $	$ 0	$ 1	$ 0	$ 2
PUERTO RICO
Troubled Debt Restructuring
Loan count | loans	153	223	335	432
Recorded investment as of first default date | $	$ 6,928	$ 7,741	$ 14,918	$ 20,835
PUERTO RICO | Commercial multi-family
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
PUERTO RICO | CRE non-owner occupied
Troubled Debt Restructuring
Loan count | loans	0	0	2	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 327	$ 0
PUERTO RICO | CRE owner occupied
Troubled Debt Restructuring
Loan count | loans	1	0	7	1
Recorded investment as of first default date | $	$ 47	$ 0	$ 2,503	$ 291
PUERTO RICO | Commercial and industrial
Troubled Debt Restructuring
Loan count | loans	2	1	2	2
Recorded investment as of first default date | $	$ 27	$ 64	$ 27	$ 154
PUERTO RICO | Construction
Troubled Debt Restructuring
Loan count | loans	0	0	0	2
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 1,192
PUERTO RICO | Mortgages
Troubled Debt Restructuring
Loan count | loans	55	48	82	126
Recorded investment as of first default date | $	$ 5,501	$ 5,941	$ 8,734	$ 16,042
PUERTO RICO | Leasing
Troubled Debt Restructuring
Loan count | loans	1	4	5	5
Recorded investment as of first default date | $	$ 32	$ 36	$ 63	$ 43
PUERTO RICO | Credit cards
Troubled Debt Restructuring
Loan count | loans	56	138	171	240
Recorded investment as of first default date | $	$ 594	$ 1,225	$ 1,758	$ 2,341
PUERTO RICO | Home equity lines of credit
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
PUERTO RICO | Personal
Troubled Debt Restructuring
Loan count | loans	37	31	64	50
Recorded investment as of first default date | $	$ 711	$ 474	$ 1,473	$ 692
PUERTO RICO | Auto
Troubled Debt Restructuring
Loan count | loans	1	0	2	4
Recorded investment as of first default date | $	$ 16	$ 0	$ 33	$ 78
PUERTO RICO | Other
Troubled Debt Restructuring
Loan count | loans	0	1	0	2
Recorded investment as of first default date | $	$ 0	$ 1	$ 0	$ 2
UNITED STATES
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Commercial multi-family
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | CRE non-owner occupied
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | CRE owner occupied
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Commercial and industrial
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Construction
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Mortgages
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Legacy
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Credit cards
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Home equity lines of credit
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Personal
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Auto
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0
UNITED STATES | Other
Troubled Debt Restructuring
Loan count | loans	0	0	0	0
Recorded investment as of first default date | $	$ 0	$ 0	$ 0	$ 0