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Amortized Cost, Gross Unrealized Gains and Losses, Approximate Fair Value, Weighted Average Yield and Contractual Maturities of Investment Securities Held-To-Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 125,383 $ 122,354 $ 212,962
Gross Unrealized Gains 825 454  
Gross Unrealized Losses 954 1,935  
Fair Value 125,254 120,873  
Weighted Average Yield 4.28% 3.51%  
Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 7,275    
Fair Value 7,281    
More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 37,424    
Fair Value 37,937    
More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 18,512    
Fair Value 18,688    
More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 62,172    
Fair Value 61,348    
U.S. Treasury securities
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 25,873 25,777
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 1  
Fair Value 0 25,872  
Weighted Average Yield 0.00% 0.11%  
U.S. Treasury securities | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 25,873 25,777
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 1  
Fair Value 0 25,872  
Weighted Average Yield 0.00% 0.11%  
U.S. Treasury securities | More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
U.S. Treasury securities | More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
U.S. Treasury securities | More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 160 176 220
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 9 10  
Fair Value 151 166  
Weighted Average Yield 5.45% 5.45%  
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 160 176 220
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 9    
Fair Value 151 166  
Weighted Average Yield 5.45% 5.45%  
Other
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 26,250 4,330 4,823
Gross Unrealized Gains 83 0  
Gross Unrealized Losses 0 7  
Fair Value 26,333 4,323  
Weighted Average Yield 3.41% 1.15%  
Other | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 4,080 3,573
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 4,080  
Weighted Average Yield 0.00% 1.15%  
Other | More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 26,250 250 1,250
Gross Unrealized Gains 83 0  
Gross Unrealized Losses 0 7  
Fair Value 26,333 243  
Weighted Average Yield 3.41% 1.20%  
Other | More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Other | More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0 0 0
Gross Unrealized Gains 0 0  
Gross Unrealized Losses 0 0  
Fair Value 0 0  
Weighted Average Yield 0.00% 0.00%  
Obligations of U.S. Government sponsored entities
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0    
Gross Unrealized Gains 0    
Gross Unrealized Losses 0    
Fair Value 0    
Weighted Average Yield 0.00%    
Obligations of U.S. Government sponsored entities | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0    
Gross Unrealized Gains 0    
Gross Unrealized Losses 0    
Fair Value 0    
Weighted Average Yield 0.00%    
Obligations of U.S. Government sponsored entities | More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0    
Gross Unrealized Gains 0    
Gross Unrealized Losses 0    
Fair Value 0    
Weighted Average Yield 0.00%    
Obligations of U.S. Government sponsored entities | More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0    
Gross Unrealized Gains 0    
Gross Unrealized Losses 0    
Fair Value 0    
Weighted Average Yield 0.00%    
Obligations of U.S. Government sponsored entities | More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 0    
Gross Unrealized Gains 0    
Gross Unrealized Losses 0    
Fair Value 0    
Weighted Average Yield 0.00%    
Obligations of Puerto Rico, States and political subdivisions
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 98,973 91,975 182,142
Gross Unrealized Gains 742 454  
Gross Unrealized Losses 945 1,917  
Fair Value 98,770 90,512  
Weighted Average Yield 4.51% 4.58%  
Obligations of Puerto Rico, States and political subdivisions | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 7,275 2,150 7,015
Gross Unrealized Gains 6 6  
Gross Unrealized Losses 0 0  
Fair Value 7,281 2,156  
Weighted Average Yield 2.24% 5.33%  
Obligations of Puerto Rico, States and political subdivisions | More Than One And Within Five Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 11,174 15,529 109,415
Gross Unrealized Gains 430 333  
Gross Unrealized Losses 0 0  
Fair Value 11,604 15,862  
Weighted Average Yield 5.80% 4.10%  
Obligations of Puerto Rico, States and political subdivisions | More Than Five And Within Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 18,512 17,594 17,112
Gross Unrealized Gains 266 115  
Gross Unrealized Losses 90 268  
Fair Value 18,688 17,441  
Weighted Average Yield 5.99% 5.96%  
Obligations of Puerto Rico, States and political subdivisions | More Than Ten Years From Balance Sheet Date [Member]
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 62,012 56,702 48,600
Gross Unrealized Gains 40 0  
Gross Unrealized Losses 855 1,649  
Fair Value $ 61,197 $ 55,053  
Weighted Average Yield 4.11% 4.25%