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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets        
Mortgage servicing rights $ 156,529 $ 161,099 $ 153,949 $ 154,430
Derivatives 28,996 34,710    
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 410 [1] 412 [1]    
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 5,762,101 [1] 5,287,865 [1]    
Mortgage servicing rights 0 0    
Derivatives 28,998 34,793    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 25,714 32,378    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 6,379 [1] 6,523 [1]    
Mortgage servicing rights 156,529 161,099    
Derivatives 0 0    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value 126,345 128,299    
Fair Value, Measurements, Recurring [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,768,890 5,294,800    
Trading Account Assets Fair Value Disclosure 359,247 339,660    
Mortgage servicing rights 156,529 161,099    
Derivatives 28,998 34,793    
Total 6,313,664 5,830,352    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (25,714) (32,378)    
Business Acquisition, Contingent Consideration, at Fair Value (126,345) (128,299)    
Total (152,059) (160,677)    
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 28,090 28,482    
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 2,185,139 1,629,205    
Fair Value, Measurements, Recurring [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 68,628 66,377    
Trading Account Assets Fair Value Disclosure 8,166 7,586    
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 2,388,607 2,418,296    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 313 513    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,081,930 1,135,641    
Trading Account Assets Fair Value Disclosure 332,113 312,751    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 4,209 4,116    
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 11,974 12,170    
Trading Account Assets Fair Value Disclosure 17,032 17,474    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 1,936 1,849    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 410 412    
Trading Account Assets Fair Value Disclosure 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Total 410 412    
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 410 412    
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 5,762,101 5,287,865    
Trading Account Assets Fair Value Disclosure 347,670 326,509    
Mortgage servicing rights 0 0    
Derivatives 28,998 34,793    
Total 6,138,769 5,649,167    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (25,714) (32,378)    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Total (25,714) (32,378)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 28,090 28,482    
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 2,185,139 1,629,205    
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 68,628 66,377    
Trading Account Assets Fair Value Disclosure 8,166 7,586    
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 2,388,607 2,418,296    
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 313 513    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,075,551 1,129,118    
Trading Account Assets Fair Value Disclosure 323,812 302,952    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,799 3,704    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 11,974 12,170    
Trading Account Assets Fair Value Disclosure 15,317 15,545    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 375 426    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 6,379 6,523    
Trading Account Assets Fair Value Disclosure 11,577 13,151    
Mortgage servicing rights 156,529 161,099    
Derivatives 0 0    
Total 174,485 180,773    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value (126,345) (128,299)    
Total (126,345) (128,299)    
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 6,379 6,523    
Trading Account Assets Fair Value Disclosure 8,301 9,799    
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 1,715 1,929    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure $ 1,561 $ 1,423    
[1] Refer to Note 25 to the consolidated financial statements for the fair value by class of financial asset and its hierarchy level.