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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 5,791,925 $ 5,345,877
Gross Unrealized Gains 80,761 79,357
Gross Unrealized Losses 103,796 130,434
Fair Value 5,768,890 5,294,800
Weighted Average Yield 2.15% 2.30%
US Treasury Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26,281 26,474
Gross Unrealized Gains 1,809 2,008
Gross Unrealized Losses 0 0
Fair Value 28,090 28,482
Weighted Average Yield 3.86% 3.85%
US Treasury Securities [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 Available-for-sale Securities [Line Items]    
Amortized Cost 26,281 26,474
Gross Unrealized Gains 1,809 2,008
Gross Unrealized Losses 0 0
Fair Value 28,090 28,482
Weighted Average Yield 3.86% 3.85%
US Treasury Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 Available-for-sale 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 Available-for-sale Securities [Line Items]    
Amortized Cost 2,211,113 1,664,085
Gross Unrealized Gains 1,586 1,817
Gross Unrealized Losses 27,560 36,697
Fair Value 2,185,139 1,629,205
Weighted Average Yield 1.27% 1.38%
US Government Sponsored Enterprises Debt Securities Member | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 6,998 25,021
Gross Unrealized Gains 8 39
Gross Unrealized Losses 0 0
Fair Value 7,006 25,060
Weighted Average Yield 0.14% 1.85%
US Government Sponsored Enterprises Debt Securities Member | More Than One And Within Five Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,803,615 1,087,453
Gross Unrealized Gains 1,415 1,678
Gross Unrealized Losses 12,537 12,715
Fair Value 1,792,493 1,076,416
Weighted Average Yield 1.20% 1.26%
US Government Sponsored Enterprises Debt Securities Member | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 377,500 528,611
Gross Unrealized Gains 163 100
Gross Unrealized Losses 13,396 21,742
Fair Value 364,267 506,969
Weighted Average Yield 1.52% 1.52%
US Government Sponsored Enterprises Debt Securities Member | More Than Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 23,000 23,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,627 2,240
Fair Value 21,373 20,760
Weighted Average Yield 3.13% 3.12%
Puerto Rico States And Political Subdivisions Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 77,475 78,178
Gross Unrealized Gains 88 74
Gross Unrealized Losses 8,935 11,875
Fair Value 68,628 66,377
Weighted Average Yield 5.52% 5.89%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,391 6,228
Gross Unrealized Gains 35 45
Gross Unrealized Losses 47 85
Fair Value 5,379 6,188
Weighted Average Yield 2.86% 4.64%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 23,261 23,147
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,248 1,978
Fair Value 22,013 21,169
Weighted Average Yield 5.46% 6.33%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 48,823 48,803
Gross Unrealized Gains 53 29
Gross Unrealized Losses 7,640 9,812
Fair Value 41,236 39,020
Weighted Average Yield 5.85% 5.84%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,433,404 2,474,765
Gross Unrealized Gains 18,329 19,554
Gross Unrealized Losses 63,126 76,023
Fair Value 2,388,607 2,418,296
Weighted Average Yield 2.07% 2.06%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 U S Government Sponsored Enterprises And U S Government [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,510 5,131
Gross Unrealized Gains 84 101
Gross Unrealized Losses 0 0
Fair Value 4,594 5,232
Weighted Average Yield 1.84% 1.79%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 30,681 31,613
Gross Unrealized Gains 1,036 921
Gross Unrealized Losses 13 0
Fair Value 31,704 32,534
Weighted Average Yield 2.90% 2.98%
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 Available-for-sale Securities [Line Items]    
Amortized Cost 2,398,213 2,438,021
Gross Unrealized Gains 17,209 18,532
Gross Unrealized Losses 63,113 76,023
Fair Value 2,352,309 2,380,530
Weighted Average Yield 2.06% 2.05%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 311 509
Gross Unrealized Gains 2 4
Gross Unrealized Losses 0 0
Fair Value 313 513
Weighted Average Yield 3.91% 3.78%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 Available-for-sale 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 Available-for-sale 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 Available-for-sale Securities [Line Items]    
Amortized Cost 311 509
Gross Unrealized Gains 2 4
Gross Unrealized Losses 0 0
Fair Value 313 513
Weighted Average Yield 3.91% 3.78%
Collateralized Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,028,177 1,086,446
Gross Unrealized Gains 57,718 54,722
Gross Unrealized Losses 3,965 5,527
Fair Value 1,081,930 1,135,641
Weighted Average Yield 3.92% 3.95%
Collateralized Mortgage Backed Securities [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 166 419
Gross Unrealized Gains 10 24
Gross Unrealized Losses 0 0
Fair Value 176 443
Weighted Average Yield 2.65% 3.14%
Collateralized Mortgage Backed Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 19,809 15,921
Gross Unrealized Gains 1,018 833
Gross Unrealized Losses 0 0
Fair Value 20,827 16,754
Weighted Average Yield 4.41% 4.50%
Collateralized Mortgage Backed Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 104,025 62,373
Gross Unrealized Gains 3,589 3,058
Gross Unrealized Losses 1,525 1,214
Fair Value 106,089 64,217
Weighted Average Yield 3.36% 4.12%
Collateralized Mortgage Backed Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 904,177 1,007,733
Gross Unrealized Gains 53,101 50,807
Gross Unrealized Losses 2,440 4,313
Fair Value 954,838 1,054,227
Weighted Average Yield 3.97% 3.93%
Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,178 3,178
Gross Unrealized Gains 1,166 1,109
Gross Unrealized Losses 135 171
Fair Value 4,209 4,116
Weighted Average Yield 4.12% 4.06%
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,986 12,242
Gross Unrealized Gains 63 69
Gross Unrealized Losses 75 141
Fair Value 11,974 12,170
Weighted Average Yield 2.07% 2.09%
Other Securities [Member] | Within One Year From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,547 9,638
Gross Unrealized Gains 0 0
Gross Unrealized Losses 75 141
Fair Value 9,472 9,497
Weighted Average Yield 1.68% 1.68%
Other Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale 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 Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,439 2,604
Gross Unrealized Gains 63 69
Gross Unrealized Losses 0 0
Fair Value $ 2,502 $ 2,673
Weighted Average Yield 3.61% 3.61%