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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Assets        
Mortgage servicing rights $ 155,711 $ 151,323 $ 162,619 $ 166,907
Derivatives 53,244 61,886    
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,523 [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 5,065,892 [1]      
Mortgage servicing rights 0      
Derivatives 53,250      
Loans held-for-sale 4,689      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 58,410      
Business Acquisition, Contingent Consideration, at Fair Value 0      
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,382 [1]      
Mortgage servicing rights 155,711      
Derivatives 0      
Loans held-for-sale 369,503      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0      
Business Acquisition, Contingent Consideration, at Fair Value 101,013      
Fair Value, Measurements, Recurring [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,076,797 5,009,823    
Trading Account Assets Fair Value Disclosure 417,463 436,330    
Mortgage servicing rights 155,711 151,323    
Derivatives 53,250 61,887    
Total 5,703,221 5,659,363    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (58,410) (66,700)    
Business Acquisition, Contingent Consideration, at Fair Value (101,013) (99,762)    
Total (159,423) (166,462)    
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 37,928 38,668    
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,039,398 985,546    
Fair Value, Measurements, Recurring [Member] | Obligations of Puerto Rico, States and political subdivisions
       
Assets        
Available For Sale Securities Fair Value Disclosure 49,909 58,728    
Trading Account Assets Fair Value Disclosure 32,049 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 2,001,582 1,697,642    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 40,334 57,792    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,875,726 2,139,569    
Trading Account Assets Fair Value Disclosure 361,280 325,205    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,022 6,916    
Fair Value, Measurements, Recurring [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 24,898 24,962    
Trading Account Assets Fair Value Disclosure 20,550 17,248    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 3,584 3,545    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,523 3,465    
Trading Account Assets Fair Value Disclosure 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Total 3,523 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] | Obligations of Puerto Rico, States and political subdivisions
       
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 3,523 3,465    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other
       
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 5,065,892 4,998,923    
Trading Account Assets Fair Value Disclosure 394,547 407,709    
Mortgage servicing rights 0 0    
Derivatives 53,250 61,887    
Total 5,513,689 5,468,519    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (58,410) (66,700)    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Total (58,410) (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 37,928 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 1,039,398 985,546    
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 49,909 58,728    
Trading Account Assets Fair Value Disclosure 32,049 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 2,001,582 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 40,334 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 1,868,344 2,132,134    
Trading Account Assets Fair Value Disclosure 343,575 303,428    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,499 3,451    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other
       
Assets        
Available For Sale Securities Fair Value Disclosure 24,898 24,962    
Trading Account Assets Fair Value Disclosure 18,194 13,212    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 729 737    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,382 7,435    
Trading Account Assets Fair Value Disclosure 22,916 28,621    
Mortgage servicing rights 155,711 151,323    
Derivatives 0 0    
Total 186,009 187,379    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value (101,013) (99,762)    
Total (101,013) (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] | Obligations of Puerto Rico, States and political subdivisions
       
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 7,382 7,435    
Trading Account Assets Fair Value Disclosure 17,705 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
       
Assets        
Available For Sale Securities Fair Value Disclosure 0 0    
Trading Account Assets Fair Value Disclosure 2,356 4,036    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure $ 2,855 $ 2,808    
[1] Refer to Note 22 to the consolidated financial statements for the fair value by class of financial asset and its hierarchy level.