FDIC loss share - Additional Information (Detail) (USD $)	6 Months Ended	3 Months Ended							3 Months Ended
	Jun. 30, 2014 D	Jun. 30, 2014 Payment Percentage True Up Payment [Member]	Jun. 30, 2014 Intrinsic Loss Estimate Trueup Payment [Member]	Jun. 30, 2014 Asset Discount Trueup Payment [Member]	Jun. 30, 2014 Cumulative Shared Loss Payments Trueup Payment [Member]	Jun. 30, 2014 Servicing Percentage Trueup Payment [Member]	Jun. 30, 2014 Banco Popular De Puerto Rico [Member]	Jun. 30, 2014 Banco Popular De Puerto Rico [Member] Other Consumer And Commercial Loans [Member]	Jun. 30, 2014 Federal Deposit Insurance Corporation [Member]	Jun. 30, 2014 Federal Deposit Insurance Corporation [Member] Residential Mortgage	Jun. 30, 2014 Federal Deposit Insurance Corporation [Member] Other Consumer And Commercial Loans [Member]
Business Acquisition, Contingent Consideration [Line Items]
Loss Sharing Term										10	5
Loss Share Agreements Reimbursement Term								8
True Up Payment Term	45
Percent Calculation Intrinsic Loss Estimate			$ 925,000,000
Calculation Percent Asset Discount Per Bid	1,100,000,000
Intrinsic Loss Estimate	4,600,000,000
Servicing Amount Period Trueup Payment	twelve-month period
Fixed Percentage True Up Payment		50.00%	20.00%	25.00%	25.00%	1.00%
Loss Sharing Agreement Allocation Percentage							80.00%		80.00%
Estimated Credit Losses	$ 102,900,000
Remaining Life Of All Loan Pools Covered	six years
Indemnification Asset Remaining Life For Commercial Construction Consumer Loans	one year
Indemnification Asset Remaining Life For Single Family Mortgage Loans	six years