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Investment securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Other securities, Amortized cost $ 298,479 $ 302,648
Other securities, Gross unrealized gains      
Other securities, Gross unrealized losses      
Other securities, Estimated fair value 298,479 302,648
Investment securities, available for sale, amortized cost 4,555,109 4,643,070
Gross unrealized gains 160,328 253,619
Gross unrealized losses 23,257 157,252
Estimated fair value 4,692,180 4,739,437
Amortized cost for held to maturity 3,319,114 1,032,276
Gross unrealized gains for held to maturity 44,266 39,534
Gross unrealized losses for held to maturity 85,994 94,927
Estimated fair value for held to maturity 3,277,386 976,883
Total Amortized cost 8,172,702 5,977,994
Total for Gross unrealized gains 204,594 293,153
Total for Gross unrealized losses 109,251 252,179
Total for Estimated fair value 8,268,045 6,018,968
Government Issued or Guaranteed [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 4,214,895 3,163,210
Gross unrealized gains 116,758 208,060
Gross unrealized losses 1,254 229
Estimated fair value 4,330,399 3,371,041
Amortized cost for held to maturity 2,914,687 597,340
Gross unrealized gains for held to maturity 39,987 31,727
Gross unrealized losses for held to maturity 29,015   
Estimated fair value for held to maturity 2,925,659 629,067
Privately issued [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Amortized cost for held to maturity 224,767 242,378
Gross unrealized gains for held to maturity    160
Gross unrealized losses for held to maturity 56,891 94,900
Estimated fair value for held to maturity 167,876 147,638
Privately Issued Mortgage-Backed Securities [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 2,789 1,142,287
Gross unrealized gains 1,032 7,272
Gross unrealized losses 5 125,673
Estimated fair value 3,816 1,023,886
Collateralized Debt Obligations [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 42,686 43,228
Gross unrealized gains 17,724 19,663
Gross unrealized losses 1,107 1,022
Estimated fair value 59,303 61,869
Obligations of States and Political Subdivisions [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 17,614 20,375
Gross unrealized gains 355 534
Gross unrealized losses 6 8
Estimated fair value 17,963 20,901
Amortized cost for held to maturity 170,370 182,103
Gross unrealized gains for held to maturity 4,279 7,647
Gross unrealized losses for held to maturity 88 27
Estimated fair value for held to maturity 174,561 189,723
Other Debt Securities [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 137,661 136,603
Gross unrealized gains 1,758 2,247
Gross unrealized losses 20,015 26,900
Estimated fair value 119,404 111,950
Amortized cost for held to maturity 9,290 10,455
Gross unrealized gains for held to maturity      
Gross unrealized losses for held to maturity      
Estimated fair value for held to maturity 9,290 10,455
U.S. Treasury and Federal Agencies [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 37,432 38,422
Gross unrealized gains 480 922
Gross unrealized losses 25   
Estimated fair value 37,887 39,344
Equity Securities [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Investment securities, available for sale, amortized cost 102,032 98,945
Gross unrealized gains 22,221 14,921
Gross unrealized losses 845 3,420
Estimated fair value $ 123,408 $ 110,446