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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, 2011
Dec. 31, 2010
Jun. 30, 2010
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 129,910 $ 122,354 $ 209,416
Gross Unrealized Gains 8,050 454 878
Gross Unrealized Losses 1,001 1,935 1,087
Fair Value 136,959 120,873 209,207
Weighted Average Yield 3.87% 3.51% 4.38%
U.S. Treasury securities
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 12,362 25,873 25,797
Gross Unrealized Gains 1   4
Gross Unrealized Losses   1  
Fair Value 12,363 25,872 25,801
Weighted Average Yield 0.09% 0.11% 0.22%
U.S. Treasury securities | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 12,362 25,873 25,797
Gross Unrealized Gains 1   4
Gross Unrealized Losses   1  
Fair Value 12,363 25,872 25,801
Weighted Average Yield 0.09% 0.11% 0.22%
Collateralized mortgage obligations - private label
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 166 176 209
Gross Unrealized Losses 9 10 12
Fair Value 157 166 197
Weighted Average Yield 5.43% 5.45% 5.45%
Collateralized mortgage obligations - private label | After 10 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 166 176 209
Gross Unrealized Losses 9 10 12
Fair Value 157 166 197
Weighted Average Yield 5.43% 5.45% 5.45%
Other
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 26,500 4,330 2,622
Gross Unrealized Gains 375    
Gross Unrealized Losses   7  
Fair Value 26,875 4,323 2,622
Weighted Average Yield 3.35% 1.15% 1.40%
Other | After 1 to 5 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 25,250 250 1,250
Gross Unrealized Gains 375    
Gross Unrealized Losses   7  
Fair Value 25,625 243 1,250
Weighted Average Yield 3.47% 1.20% 0.84%
Other | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 1,250 4,080 1,372
Fair Value 1,250 4,080 1,372
Weighted Average Yield 0.88% 1.15% 1.91%
Obligations of U.S. Government sponsored entities
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 90,882    
Gross Unrealized Gains 7,674    
Gross Unrealized Losses 992    
Fair Value 97,564    
Weighted Average Yield 4.54%    
Obligations of U.S. Government sponsored entities | After 1 to 5 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 15,974    
Gross Unrealized Gains 495    
Fair Value 16,469    
Weighted Average Yield 4.19%    
Obligations of U.S. Government sponsored entities | After 5 to 10 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 18,340    
Gross Unrealized Gains 393    
Gross Unrealized Losses 78    
Fair Value 18,655    
Weighted Average Yield 5.97%    
Obligations of U.S. Government sponsored entities | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 2,235    
Gross Unrealized Gains 22    
Fair Value 2,257    
Weighted Average Yield 5.56%    
Obligations of U.S. Government sponsored entities | After 10 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 54,333    
Gross Unrealized Gains 6,764    
Gross Unrealized Losses 914    
Fair Value 60,183    
Weighted Average Yield 4.12%    
Obligations of Puerto Rico, States and political subdivisions
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost   91,975 180,788
Gross Unrealized Gains   454 874
Gross Unrealized Losses   1,917 1,075
Fair Value   90,512 180,587
Weighted Average Yield   4.58% 5.01%
Obligations of Puerto Rico, States and political subdivisions | After 1 to 5 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost   15,529 109,820
Gross Unrealized Gains   333 509
Fair Value   15,862 110,329
Weighted Average Yield   4.10% 5.52%
Obligations of Puerto Rico, States and political subdivisions | After 5 to 10 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost   17,594 17,808
Gross Unrealized Gains   115 289
Gross Unrealized Losses   268 75
Fair Value   17,441 18,022
Weighted Average Yield   5.96% 5.94%
Obligations of Puerto Rico, States and political subdivisions | Within 1 year
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost   2,150 7,110
Gross Unrealized Gains   6 13
Fair Value   2,156 7,123
Weighted Average Yield   5.33% 2.12%
Obligations of Puerto Rico, States and political subdivisions | After 10 years
     
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost   56,702 46,050
Gross Unrealized Gains     63
Gross Unrealized Losses   1,649 1,000
Fair Value   $ 55,053 $ 45,113
Weighted Average Yield   4.25% 3.88%