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Changes in the Accretable Yield for the Acquired Loans in the Westernbank FDIC-Assisted Transaction (Detail) (Westernbank Puerto Rico [Member], Acquired Loans In An F D I C Assisted Transaction [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Accretable yield    
Beginning Balance $ 1,331,108 $ 0
Additions 0 1,538,059
Accretion (352,401) (206,951)
Reclassifications from nonaccretable balance 491,552 0
Ending Balance 1,470,259 1,331,108
Carrying amount of loans    
Beginning Balance 4,539,928 0
Additions 0 4,909,647
Accretion 352,401 206,951
Collections (855,858) (576,670)
Ending Balance 4,036,471 4,539,928
Less: Allowance for loan losses (83,477) 0
Carrying amount, net of allowance 3,952,994 4,539,928
Non-credit Impaired Loans
   
Accretable yield    
Beginning Balance 1,307,927 0
Additions 0 1,487,634
Accretion (271,760) (179,707)
Reclassifications from nonaccretable balance 392,597 0
Ending Balance 1,428,764 1,307,927
Carrying amount of loans    
Beginning Balance 3,894,379 0
Additions 0 4,212,857
Accretion 271,760 179,707
Collections (719,688) (498,185)
Ending Balance 3,446,451 3,894,379
Less: Allowance for loan losses (62,951) 0
Carrying amount, net of allowance 3,383,500 3,894,379
Credit Impaired Loans
   
Accretable yield    
Beginning Balance 23,181 0
Additions 0 50,425
Accretion (80,641) (27,244)
Reclassifications from nonaccretable balance 98,955 0
Ending Balance 41,495 23,181
Carrying amount of loans    
Beginning Balance 645,549 0
Additions 0 696,790
Accretion 80,641 27,244
Collections (136,170) (78,485)
Ending Balance 590,020 645,549
Less: Allowance for loan losses (20,526) 0
Carrying amount, net of allowance $ 569,494 $ 645,549