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Amortized Cost, Gross Unrealized Gains and Losses, Approximate Fair Value, Weighted Average Yield and Contractual Maturities of Investment Securities Available-For-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 5,174,026 $ 5,052,278 $ 6,260,169
Gross Unrealized Gains 221,951 191,899 231,214
Gross Unrealized Losses 6,486 7,325 10,196
Fair Value 5,389,491 5,236,852 6,481,187
Weighted Average Yield 3.66% 3.78% 3.70%
U.S. Treasury securities
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 35,334 35,677 136,799
Gross Unrealized Gains 2,858 2,459 3,888
Fair Value 38,192 38,136 140,687
Weighted Average Yield 3.35% 3.36% 1.97%
U.S. Treasury securities | After 1 to 5 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 35,334 7,001 107,776
Gross Unrealized Gains 2,858 122 1,311
Fair Value 38,192 7,123 109,087
Weighted Average Yield 3.35% 1.50% 1.47%
U.S. Treasury securities | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost   28,676 29,023
Gross Unrealized Gains   2,337 2,577
Fair Value   31,013 31,600
Weighted Average Yield   3.81% 3.80%
Obligations of U.S. Government sponsored entities
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,200,962 1,156,205 1,677,585
Gross Unrealized Gains 47,799 55,760 71,890
Gross Unrealized Losses 73 661  
Fair Value 1,248,688 1,211,304 1,749,475
Weighted Average Yield 3.45% 3.68% 3.49%
Obligations of U.S. Government sponsored entities | After 1 to 5 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 914,238 1,000,955 1,254,234
Gross Unrealized Gains 45,355 53,681 65,786
Gross Unrealized Losses 73 661  
Fair Value 959,520 1,053,975 1,320,020
Weighted Average Yield 3.67% 3.72% 3.41%
Obligations of U.S. Government sponsored entities | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 180,000 1,512 11,928
Gross Unrealized Gains 1,950 36 83
Fair Value 181,950 1,548 12,011
Weighted Average Yield 2.66% 6.30% 5.30%
Obligations of U.S. Government sponsored entities | Within 1 year
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 106,724 153,738 384,536
Gross Unrealized Gains 494 2,043 5,504
Fair Value 107,218 155,781 390,040
Weighted Average Yield 2.91% 3.39% 3.52%
Obligations of U.S. Government sponsored entities | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost     26,887
Gross Unrealized Gains     517
Fair Value     27,404
Weighted Average Yield     5.68%
Obligations of Puerto Rico, States and political subdivisions
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 33,897 52,527 55,015
Gross Unrealized Gains 393 393 621
Gross Unrealized Losses 24 218 4
Fair Value 34,266 52,702 55,632
Weighted Average Yield 4.51% 4.70% 4.72%
Obligations of Puerto Rico, States and political subdivisions | After 1 to 5 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 15,567 15,853 22,406
Gross Unrealized Gains 277 279 171
Gross Unrealized Losses 24 5  
Fair Value 15,820 16,127 22,577
Weighted Average Yield 4.52% 4.52% 4.09%
Obligations of Puerto Rico, States and political subdivisions | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 2,055 20,765 27,049
Gross Unrealized Gains 25 43 321
Gross Unrealized Losses   194 4
Fair Value 2,080 20,614 27,366
Weighted Average Yield 5.30% 5.07% 5.12%
Obligations of Puerto Rico, States and political subdivisions | Within 1 year
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 10,845 10,404  
Gross Unrealized Gains 12 19  
Fair Value 10,857 10,423  
Weighted Average Yield 3.96% 3.92%  
Obligations of Puerto Rico, States and political subdivisions | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 5,430 5,505 5,560
Gross Unrealized Gains 79 52 129
Gross Unrealized Losses   19  
Fair Value 5,509 5,538 5,689
Weighted Average Yield 5.29% 5.28% 5.28%
Collateralized mortgage obligations - federal agencies
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,570,571 1,205,380 1,413,796
Gross Unrealized Gains 43,046 33,861 33,651
Gross Unrealized Losses 555 947 2,429
Fair Value 1,613,062 1,238,294 1,445,018
Weighted Average Yield 2.93% 2.84% 2.92%
Collateralized mortgage obligations - federal agencies | After 1 to 5 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 2,728 1,846 4,714
Gross Unrealized Gains 93 105 136
Fair Value 2,821 1,951 4,850
Weighted Average Yield 4.67% 4.77% 4.61%
Collateralized mortgage obligations - federal agencies | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 78,595 107,186 98,717
Gross Unrealized Gains 1,077 1,507 1,507
Gross Unrealized Losses 339 936 88
Fair Value 79,333 107,757 100,136
Weighted Average Yield 2.45% 2.50% 2.65%
Collateralized mortgage obligations - federal agencies | Within 1 year
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost   77 159
Gross Unrealized Gains   1 3
Fair Value   78 162
Weighted Average Yield   3.88% 4.06%
Collateralized mortgage obligations - federal agencies | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,489,248 1,096,271 1,310,206
Gross Unrealized Gains 41,876 32,248 32,005
Gross Unrealized Losses 216 11 2,341
Fair Value 1,530,908 1,128,508 1,339,870
Weighted Average Yield 2.95% 2.87% 2.93%
Collateralized mortgage obligations - private label
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 75,696 89,519 108,949
Gross Unrealized Gains 3 109 137
Gross Unrealized Losses 5,213 4,690 7,099
Fair Value 70,486 84,938 101,987
Weighted Average Yield 2.12% 2.17% 2.32%
Collateralized mortgage obligations - private label | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 7,224 10,208 16,737
Gross Unrealized Gains 3 31 21
Gross Unrealized Losses 308 158 522
Fair Value 6,919 10,081 16,236
Weighted Average Yield 0.72% 1.20% 2.08%
Collateralized mortgage obligations - private label | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 68,472 79,311 92,212
Gross Unrealized Gains   78 116
Gross Unrealized Losses 4,905 4,532 6,577
Fair Value 63,567 74,857 85,751
Weighted Average Yield 2.27% 2.29% 2.37%
Mortgage backed securities
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 2,224,658 2,478,593 2,859,020
Gross Unrealized Gains 124,709 98,200 120,825
Gross Unrealized Losses 343 638 161
Fair Value 2,349,024 2,576,155 2,979,684
Weighted Average Yield 4.28% 4.29% 4.33%
Mortgage backed securities | After 1 to 5 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 11,516 15,738 20,438
Gross Unrealized Gains 444 649 544
Gross Unrealized Losses   3  
Fair Value 11,960 16,384 20,982
Weighted Average Yield 3.99% 3.98% 3.96%
Mortgage backed securities | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 159,166 170,662 188,865
Gross Unrealized Gains 11,198 10,580 12,762
Gross Unrealized Losses 2 3  
Fair Value 170,362 181,239 201,627
Weighted Average Yield 4.71% 4.71% 4.72%
Mortgage backed securities | Within 1 year
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 633 2,983 20,661
Gross Unrealized Gains 52 101 177
Fair Value 685 3,084 20,838
Weighted Average Yield 4.91% 3.62% 2.96%
Mortgage backed securities | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 2,053,343 2,289,210 2,629,056
Gross Unrealized Gains 113,015 86,870 107,342
Gross Unrealized Losses 341 632 161
Fair Value 2,166,017 2,375,448 2,736,237
Weighted Average Yield 4.25% 4.26% 4.31%
Equity securities (without contractual maturity)
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 7,795 8,722 9,005
Gross Unrealized Gains 748 855 202
Gross Unrealized Losses 278 102 503
Fair Value 8,265 9,475 8,704
Weighted Average Yield 3.44% 3.43% 3.46%
Other
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 25,113 25,655  
Gross Unrealized Gains 2,395 262  
Gross Unrealized Losses   69  
Fair Value 27,508 25,848  
Weighted Average Yield 8.86% 8.74%  
Other | After 5 to 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 17,849 17,850  
Gross Unrealized Gains 2,363 262  
Fair Value 20,212 18,112  
Weighted Average Yield 10.99% 10.98%  
Other | After 10 years
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 7,264 7,805  
Gross Unrealized Gains 32    
Gross Unrealized Losses   69  
Fair Value $ 7,296 $ 7,736  
Weighted Average Yield 3.62% 3.62%