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Changes in the Carrying Amount and the Accretable Yield for the Acquired Loans in the Westernbank FDIC-Assisted Transaction (Detail) (Acquired loans in an FDIC assisted transaction, Westernbank Puerto Rico, USD $)
In Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Accretable yield    
Beginning Balance $ 1,331,108  
Additions   1,538,059 [1]
Accretion (173,117) (206,951)
Decrease in cash flow estimates    
Reclassifications from nonaccretable balance 458,928  
Ending Balance 1,616,919 1,331,108
Carrying amount of loans    
Beginning Balance 4,539,928  
Additions   4,909,647 [1]
Accretion 173,117 206,951
Decrease in cash flow estimates (52,682)  
Collections (443,555) (576,670)
Ending Balance 4,216,808 4,539,928
Credit Impaired Loans
   
Accretable yield    
Beginning Balance 23,181  
Additions   50,425 [1]
Accretion (36,242) (27,244)
Decrease in cash flow estimates    
Reclassifications from nonaccretable balance 83,747  
Ending Balance 70,686 23,181
Carrying amount of loans    
Beginning Balance 645,549  
Additions   696,790 [1]
Accretion 36,242 27,244
Decrease in cash flow estimates (14,049)  
Collections (38,936) (78,485)
Ending Balance 628,806 645,549
Non-credit Impaired Loans
   
Accretable yield    
Beginning Balance 1,307,927  
Additions   1,487,634 [1]
Accretion (136,875) (179,707)
Decrease in cash flow estimates    
Reclassifications from nonaccretable balance 375,181  
Ending Balance 1,546,233 1,307,927
Carrying amount of loans    
Beginning Balance 3,894,379  
Additions   4,212,857 [1]
Accretion 136,875 179,707
Decrease in cash flow estimates (38,633)  
Collections (404,619) (498,185)
Ending Balance $ 3,588,002 $ 3,894,379
[1] Amount presented in the "Carrying amount of loans" column represents the estimated fair value of the loans at the date of acquisition.