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Deposits - Schedule of Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 8,101,773 $ 8,096,937
Total interest-bearing deposits 11,877,121 11,400,429
Total deposits 19,978,894 19,497,366
Total non-interest-bearing demand deposits, Percentage of Total 40.60% 41.50%
Total interest-bearing deposits, Percentage of Total 59.40% 58.50%
Total deposits, Percentage of Total 100.00% 100.00%
Commercial and Individual [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 7,343,136 7,186,105
Total non-interest-bearing demand deposits, Percentage of Total 36.80% 36.90%
Correspondent Banks [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 341,127 436,381
Total non-interest-bearing demand deposits, Percentage of Total 1.70% 2.20%
Private Accounts [Member]
   
Deposit [Line Items]    
Savings and interest checking 3,652,924 3,812,712
Money market accounts 6,863,314 6,127,256
Time accounts of $100,000 or more 509,985 514,346
Time accounts under $100,000 443,296 464,641
Total private accounts 11,469,519 10,918,955
Savings and interest checking, Percentage of Total 18.30% 19.60%
Money market accounts, Percentage of Total 34.30% 31.40%
Time accounts of $100,000 or more, Percentage of Total 2.60% 2.60%
Time accounts under $100,000, Percentage of Total 2.20% 2.40%
Total private accounts, Percentage of Total 57.40% 56.00%
Public Funds [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 417,510 474,451
Savings and interest checking 222,236 287,391
Money market accounts 34,467 50,600
Time accounts of $100,000 or more 148,111 140,191
Time accounts under $100,000 2,788 3,292
Total public funds $ 407,602 $ 481,474
Total non-interest-bearing demand deposits, Percentage of Total 2.10% 2.40%
Savings and interest checking, Percentage of Total 1.10% 1.50%
Money market accounts, Percentage of Total 0.20% 0.30%
Time accounts under $100,000, Percentage of Total 0.00% 0.00%
Time accounts of $100,000 or more, Percentage of Total 0.70% 0.70%
Total public funds, Percentage of Total 2.00% 2.50%