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Assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Assets        
Mortgage servicing rights $ 158,367 $ 151,323 $ 157,226 $ 166,907
Derivatives 49,879 61,886    
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,941 [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 5,109,217 [1]      
Mortgage servicing rights 0      
Derivatives 49,881      
Loans held-for-sale 9,387      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 56,629      
Business Acquisition, Contingent Consideration, at Fair Value 0      
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,143 [1]      
Mortgage servicing rights 158,367      
Derivatives 0      
Loans held-for-sale 342,287      
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0      
Business Acquisition, Contingent Consideration, at Fair Value 103,688      
Fair Value, Measurements, Recurring [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 5,120,301 5,009,823    
Trading Account Assets Fair Value Disclosure 226,916 436,330    
Mortgage servicing rights 158,367 151,323    
Derivatives 49,881 61,887    
Total 5,555,465 5,659,363    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (56,629) (66,700)    
Business Acquisition, Contingent Consideration, at Fair Value (103,688) (99,762)    
Total (160,317) (166,462)    
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 37,707 38,668    
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Enterprises Debt Securities Member
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,064,967 985,546    
Fair Value, Measurements, Recurring [Member] | Puerto Rico States And Political Subdivisions Debt Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 50,004 58,728    
Trading Account Assets Fair Value Disclosure 17,584 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 2,217,042 1,697,642    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 38,913 57,792    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 1,679,260 2,139,569    
Trading Account Assets Fair Value Disclosure 188,091 325,205    
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,530 6,916    
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 24,878 24,962    
Trading Account Assets Fair Value Disclosure 17,899 17,248    
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 3,342 3,545    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,941 3,465    
Trading Account Assets Fair Value Disclosure 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Total 3,941 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 3,941 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 5,109,217 4,998,923    
Trading Account Assets Fair Value Disclosure 209,323 407,709    
Mortgage servicing rights 0 0    
Derivatives 49,881 61,887    
Total 5,368,421 5,468,519    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure (56,629) (66,700)    
Business Acquisition, Contingent Consideration, at Fair Value 0 0    
Total (56,629) (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 37,707 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 1,064,967 985,546    
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 50,004 58,728    
Trading Account Assets Fair Value Disclosure 17,584 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 2,217,042 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 38,913 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 1,672,117 2,132,134    
Trading Account Assets Fair Value Disclosure 175,522 303,428    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 3,589 3,451    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 24,878 24,962    
Trading Account Assets Fair Value Disclosure 15,509 13,212    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure 708 737    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
       
Assets        
Available For Sale Securities Fair Value Disclosure 7,143 7,435    
Trading Account Assets Fair Value Disclosure 17,593 28,621    
Mortgage servicing rights 158,367 151,323    
Derivatives 0 0    
Total 183,103 187,379    
Liabilities        
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0    
Business Acquisition, Contingent Consideration, at Fair Value (103,688) (99,762)    
Total (103,688) (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 7,143 7,435    
Trading Account Assets Fair Value Disclosure 12,569 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 2,390 4,036    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations Member
       
Assets        
Trading Account Assets Fair Value Disclosure $ 2,634 $ 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.