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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Assets        
Mortgage servicing rights $ 156,331 $ 151,323 $ 167,416 $ 166,907
Derivatives 58,604 61,886 65,169  
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,846 [1]      
Mortgage servicing rights 0      
Derivatives 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 5,127,544 [1]      
Mortgage servicing rights 0      
Derivatives 58,691      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 62,717      
Business Acquisition, Contingent Consideration, at Fair Value 0      
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,226 [1]      
Mortgage servicing rights 156,331      
Derivatives 0      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0      
Business Acquisition, Contingent Consideration, at Fair Value 100,834      
Fair Value, Measurements, Recurring [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,138,616 5,009,823 5,686,341  
Trading Account Assets Fair Value Disclosure 404,206 436,330 633,641  
Mortgage servicing rights 156,331 151,323 167,416  
Derivatives 58,691 61,887 66,327  
Total 5,757,844 5,659,363 6,553,725  
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (62,717) (66,700) (66,902)  
Trading Liabilities Fair Value Disclosure   0    
Business Acquisition, Contingent Consideration, at Fair Value (100,834) (99,762) (94,483)  
Equity Appreciation Instrument   0 (578)  
Total (163,551) (166,462) (161,963)  
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 38,084 38,668 37,682  
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,091,798 985,546 1,461,087  
Fair Value, Measurements, Recurring [Member] | Obligations of Puerto Rico, States and political subdivisions
       
Assets        
Available For Sale Securities Fair Value Disclosure 56,836 58,728 52,569  
Trading Account Assets Fair Value Disclosure 28,038 90,332 21,578  
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 1,858,807 1,697,642 1,607,345  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 54,668 57,792 77,148  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 2,004,524 2,139,569 2,413,468  
Trading Account Assets Fair Value Disclosure 352,324 325,205 587,657  
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,459 6,916 9,434  
Fair Value, Measurements, Recurring [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 26,440 24,962 27,608  
Trading Account Assets Fair Value Disclosure 20,360 17,248 21,015  
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 3,484 3,545 3,391  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,846 3,465 4,007  
Trading Account Assets Fair Value Disclosure 0 0 0  
Mortgage servicing rights 0 0 0  
Derivatives 0 0 0  
Total 3,846 3,465 4,007  
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0 0  
Trading Liabilities Fair Value Disclosure   0    
Business Acquisition, Contingent Consideration, at Fair Value 0 0 0  
Equity Appreciation Instrument   0 0  
Total 0 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 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 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Obligations of Puerto Rico, States and political subdivisions
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0 0  
Trading Account Assets Fair Value Disclosure 0 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 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 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 0  
Trading Account Assets Fair Value Disclosure 0 0 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,846 3,465 4,007  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0 0  
Trading Account Assets Fair Value Disclosure 0 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 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,127,544 4,998,923 5,674,619  
Trading Account Assets Fair Value Disclosure 381,105 407,709 607,218  
Mortgage servicing rights 0 0 0  
Derivatives 58,691 61,887 66,327  
Total 5,567,340 5,468,519 6,348,164  
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (62,717) (66,700) (66,902)  
Trading Liabilities Fair Value Disclosure   0    
Business Acquisition, Contingent Consideration, at Fair Value 0 0 0  
Equity Appreciation Instrument   0 (578)  
Total (62,717) (66,700) (67,480)  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 38,084 38,668 37,682  
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 1,091,798 985,546 1,461,087  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Obligations of Puerto Rico, States and political subdivisions
       
Assets        
Available For Sale Securities Fair Value Disclosure 56,836 58,728 52,569  
Trading Account Assets Fair Value Disclosure 28,038 90,332 21,578  
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 1,858,807 1,697,642 1,607,345  
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 54,668 57,792 77,148  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,997,298 2,132,134 2,405,753  
Trading Account Assets Fair Value Disclosure 335,961 303,428 566,795  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,613 3,451 5,427  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 26,440 24,962 27,608  
Trading Account Assets Fair Value Disclosure 16,372 13,212 18,132  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 734 737 713  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,226 7,435 7,715  
Trading Account Assets Fair Value Disclosure 23,101 28,621 26,423  
Mortgage servicing rights 156,331 151,323 167,416  
Derivatives 0 0 0  
Total 186,658 187,379 201,554  
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0 0  
Trading Liabilities Fair Value Disclosure   0    
Business Acquisition, Contingent Consideration, at Fair Value (100,834) (99,762) (94,483)  
Equity Appreciation Instrument   0 0  
Total (100,834) (99,762) (94,483)  
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 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 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Obligations of Puerto Rico, States and political subdivisions
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0 0  
Trading Account Assets Fair Value Disclosure 0 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 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 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 7,226 7,435 7,715  
Trading Account Assets Fair Value Disclosure 16,363 21,777 20,862  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0 0  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0 0  
Trading Account Assets Fair Value Disclosure 3,988 4,036 2,883  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure $ 2,750 $ 2,808 $ 2,678  
[1] Refer to Note 21 to the consolidated financial statements for the fair value by class of financial asset and its hierarchy level.