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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
Jun. 30, 2012
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 124,646 $ 125,383
Gross Unrealized Gains 2,295 825
Gross Unrealized Losses 418 954
Fair Value 126,523 125,254
Weighted Average Yield 4.25% 4.28%
US Treasury Securities [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [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
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [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
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 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 0 160
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 9
Fair Value 0 151
Weighted Average Yield 0.00% 5.45%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 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
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
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 0 160
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 9
Fair Value 0 151
Weighted Average Yield 0.00% 5.45%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 147  
Gross Unrealized Gains 5  
Gross Unrealized Losses 0  
Fair Value 152  
Weighted Average Yield 5.45%  
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 147  
Gross Unrealized Gains 5  
Gross Unrealized Losses 0  
Fair Value 152  
Weighted Average Yield 5.45%  
Other
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 26,500 26,250
Gross Unrealized Gains 29 83
Gross Unrealized Losses 0 0
Fair Value 26,529 26,333
Weighted Average Yield 3.38% 3.41%
Other | One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 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 One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 26,500 26,250
Gross Unrealized Gains 29 83
Gross Unrealized Losses 0 0
Fair Value 26,529 26,333
Weighted Average Yield 3.38% 3.41%
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
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
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Government Sponsored Enterprises Debt Securities 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%  
US Government Sponsored Enterprises Debt Securities Member | One Year 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%  
US Government Sponsored Enterprises Debt Securities Member | 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%  
US Government Sponsored Enterprises Debt Securities Member | 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%  
US Government Sponsored Enterprises Debt Securities Member | 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 97,999 98,973
Gross Unrealized Gains 2,261 742
Gross Unrealized Losses 418 945
Fair Value 99,842 98,770
Weighted Average Yield 4.48% 4.51%
Obligations of Puerto Rico, States and political subdivisions | One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,375 7,275
Gross Unrealized Gains 18 6
Gross Unrealized Losses 0 0
Fair Value 7,393 7,281
Weighted Average Yield 2.31% 2.24%
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 11,649 11,174
Gross Unrealized Gains 579 430
Gross Unrealized Losses 0 0
Fair Value 12,228 11,604
Weighted Average Yield 5.83% 5.80%
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 19,301 18,512
Gross Unrealized Gains 960 266
Gross Unrealized Losses 13 90
Fair Value 20,248 18,688
Weighted Average Yield 6.00% 5.99%
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 59,674 62,012
Gross Unrealized Gains 704 40
Gross Unrealized Losses 405 855
Fair Value $ 59,973 $ 61,197
Weighted Average Yield 4.00% 4.11%