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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
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 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 $ 3,894,905 $ 4,036,471 $ 4,423,496  
Less: Allowance for loan losses (94,559) (83,477) (5,297)  
Carrying amount, net of allowance 3,800,346 3,952,994 4,418,199 4,539,928
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 2,069,437 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 82,817 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 509,142 539,769    
Mortgages
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount 1,138,931 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 94,578 102,652    
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 3,345,311 3,446,451 3,788,650  
Less: Allowance for loan losses (63,240) (62,951) 0  
Carrying amount, net of allowance 3,282,071 3,383,500 3,788,650 3,894,379
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 1,853,679 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 79,335 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 199,724 279,561    
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 1,125,643 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 86,930 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 549,594 590,020 634,846  
Less: Allowance for loan losses (31,319) (20,526) (5,297)  
Carrying amount, net of allowance 518,275 569,494 629,549 645,549
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 215,758 215,560    
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 3,482 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 309,418 260,208    
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 13,288 102,027    
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 $ 7,648 $ 7,604