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Carrying amount of loans accounted for pursuant to ASC310-30 (Detail) (Westernbank Puerto Rico [Member], Acquired Loans In An F D I C Assisted Transaction [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount $ 3,627,209 $ 3,729,489 $ 4,036,471 $ 4,139,359 $ 4,216,808 $ 4,539,928
Less: Allowance for loan losses (103,547)   (83,477) (62,446)    
Carrying amount, net of allowance 3,523,662   3,952,994 4,076,913    
Commercial Real Estate Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 2,027,823   2,135,701      
Commercial And Industrial Loans [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 60,379   90,480      
Commercial Real Estate Construction Financing Receivable Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 381,797   539,769      
Mortgages
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 1,089,270   1,167,869      
Consumer Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 67,940   102,652      
Performing Financing Receivable Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 3,156,914 3,244,957 3,446,451 3,489,906 3,588,002 3,894,379
Less: Allowance for loan losses (64,015)   (62,951) (49,386)    
Carrying amount, net of allowance 3,092,899   3,383,500 3,440,520    
Performing Financing Receivable Member | Commercial Real Estate Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 1,833,800   1,920,141      
Performing Financing Receivable Member | Commercial And Industrial Loans [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 54,753   85,859      
Performing Financing Receivable Member | Commercial Real Estate Construction Financing Receivable Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 186,942   279,561      
Performing Financing Receivable Member | Mortgages
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 1,019,667   1,065,842      
Performing Financing Receivable Member | Consumer Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 61,752   95,048      
Nonperforming Financing Receivable Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 470,295 484,532 590,020 649,453 628,806 645,549
Less: Allowance for loan losses (39,532)   (20,526) (13,060)    
Carrying amount, net of allowance 430,763   569,494 636,393    
Nonperforming Financing Receivable Member | Commercial Real Estate Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 194,023   215,560      
Nonperforming Financing Receivable Member | Commercial And Industrial Loans [Member]
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 5,626   4,621      
Nonperforming Financing Receivable Member | Commercial Real Estate Construction Financing Receivable Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 194,855   260,208      
Nonperforming Financing Receivable Member | Mortgages
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 69,603   102,027      
Nonperforming Financing Receivable Member | Consumer Portfolio Segment Member
            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount $ 6,188   $ 7,604