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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets      
Mortgage servicing rights $ 154,430 $ 151,323 $ 166,907
Derivatives 41,925 61,886  
Fair Value, Inputs, Level 1 [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 3,827 [1]    
Mortgage servicing rights 0    
Derivatives 0    
Loans held-for-sale 0    
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure 0    
Business Acquisition, Contingent Consideration, at Fair Value 0    
Fair Value, Inputs, Level 2 [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 5,073,304 [1]    
Mortgage servicing rights 0    
Derivatives 41,935    
Loans held-for-sale 4,779    
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure 42,585    
Business Acquisition, Contingent Consideration, at Fair Value 0    
Fair Value, Inputs, Level 3 [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 7,070 [1]    
Mortgage servicing rights 154,430    
Derivatives 0    
Loans held-for-sale 376,582    
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure 0    
Business Acquisition, Contingent Consideration, at Fair Value 112,002    
Fair Value, Measurements, Recurring [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 5,084,201 5,009,823  
Trading Account Assets Fair Value Disclosure 314,515 436,330  
Mortgage servicing rights 154,430 151,323  
Derivatives 41,935 61,887  
Total 5,595,081 5,659,363  
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure (42,585) (66,700)  
Business Acquisition, Contingent Consideration, at Fair Value (112,002) (99,762)  
Total (154,587) (166,462)  
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 37,238 38,668  
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
     
Assets      
Available For Sale Securities Fair Value Disclosure 1,096,318 985,546  
Fair Value, Measurements, Recurring [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 54,981 58,728  
Trading Account Assets Fair Value Disclosure 24,801 90,332  
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 2,367,065 1,697,642  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 2,473 57,792  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 1,483,147 2,139,569  
Trading Account Assets Fair Value Disclosure 262,863 325,205  
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 7,406 6,916  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 35,573 24,962  
Trading Account Assets Fair Value Disclosure 23,734 17,248  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
     
Assets      
Trading Account Assets Fair Value Disclosure 3,117 3,545  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 3,827 3,465  
Trading Account Assets Fair Value Disclosure 0 0  
Mortgage servicing rights 0 0  
Derivatives 0 0  
Total 3,827 3,465  
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 3,827 3,465  
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 5,073,304 4,998,923  
Trading Account Assets Fair Value Disclosure 297,959 407,709  
Mortgage servicing rights 0 0  
Derivatives 41,935 61,887  
Total 5,413,198 5,468,519  
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure (42,585) (66,700)  
Business Acquisition, Contingent Consideration, at Fair Value 0 0  
Total (42,585) (66,700)  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 37,238 38,668  
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 1,096,318 985,546  
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 54,981 58,728  
Trading Account Assets Fair Value Disclosure 24,801 90,332  
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 2,367,065 1,697,642  
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 2,473 57,792  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 1,476,077 2,132,134  
Trading Account Assets Fair Value Disclosure 251,046 303,428  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 3,579 3,451  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 35,573 24,962  
Trading Account Assets Fair Value Disclosure 21,494 13,212  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
     
Assets      
Trading Account Assets Fair Value Disclosure 618 737  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
     
Assets      
Available For Sale Securities Fair Value Disclosure 7,070 7,435  
Trading Account Assets Fair Value Disclosure 16,556 28,621  
Mortgage servicing rights 154,430 151,323  
Derivatives 0 0  
Total 178,056 187,379  
Liabilities      
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0  
Business Acquisition, Contingent Consideration, at Fair Value (112,002) (99,762)  
Total (112,002) (99,762)  
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 7,070 7,435  
Trading Account Assets Fair Value Disclosure 11,817 21,777  
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 2,240 4,036  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
     
Assets      
Trading Account Assets Fair Value Disclosure $ 2,499 $ 2,808  
[1] Refer to Note 31 to the consolidated financial statements for the fair value by class of financial asset and its hierarchy level.