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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Assets        
Mortgage servicing rights $ 153,444 $ 154,430 $ 155,711 $ 151,323
Derivatives 37,697 41,925    
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,006 [1] 3,827    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Fair Value, Inputs, Level 2 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,102,874 [1] 5,073,304    
Mortgage servicing rights 0 0    
Derivatives 37,950 41,935    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 33,866 42,585    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 6,756 [1] 7,070    
Mortgage servicing rights 153,444 154,430    
Derivatives 0 0    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value 119,253 112,002    
Fair Value, Measurements, Recurring [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,114,636 5,084,201    
Trading Account Assets Fair Value Disclosure 293,829 314,515    
Mortgage servicing rights 153,444 154,430    
Derivatives 37,950 41,935    
Total 5,599,859 5,595,081    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (33,866) (42,585)    
Business Acquisition, Contingent Consideration, at Fair Value (119,253) (112,002)    
Total (153,119) (154,587)    
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 44,233 37,238    
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,135,118 1,096,318    
Fair Value, Measurements, Recurring [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 47,258 54,981    
Trading Account Assets Fair Value Disclosure 17,199 24,801    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 2,656,207 2,367,065    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,205 2,473    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,209,417 1,483,147    
Trading Account Assets Fair Value Disclosure 252,720 262,863    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 8,642 7,406    
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 12,556 35,573    
Trading Account Assets Fair Value Disclosure 21,773 23,734    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 2,137 3,117    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,006 3,827    
Trading Account Assets Fair Value Disclosure 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Total 5,006 3,827    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Total 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,006 3,827    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,102,874 5,073,304    
Trading Account Assets Fair Value Disclosure 279,799 297,959    
Mortgage servicing rights 0 0    
Derivatives 37,950 41,935    
Total 5,420,623 5,413,198    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (33,866) (42,585)    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Total (33,866) (42,585)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 44,233 37,238    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,135,118 1,096,318    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 47,258 54,981    
Trading Account Assets Fair Value Disclosure 17,199 24,801    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 2,656,207 2,367,065    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,205 2,473    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,202,661 1,476,077    
Trading Account Assets Fair Value Disclosure 242,385 251,046    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,636 3,579    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 12,556 35,573    
Trading Account Assets Fair Value Disclosure 19,731 21,494    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 484 618    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 6,756 7,070    
Trading Account Assets Fair Value Disclosure 14,030 16,556    
Mortgage servicing rights 153,444 154,430    
Derivatives 0 0    
Total 174,230 178,056    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value (119,253) (112,002)    
Total (119,253) (112,002)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 6,756 7,070    
Trading Account Assets Fair Value Disclosure 10,335 11,817    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 2,042 2,240    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure $ 1,653 $ 2,499    
[1] Refer to Note 24 to the consolidated financial statements for the fair value by class of financial asset and its hierarchy level.