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Deposits - Schedule of Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 10,162,415 $ 8,311,149
Total interest-bearing deposits 13,328,188 12,377,637
Total deposits 23,490,603 20,688,786
Total non-interest-bearing demand deposits, Percentage of Total 43.30% 40.20%
Total interest-bearing deposits, Percentage of Total 56.70% 59.80%
Total deposits, Percentage of Total 100.00% 100.00%
Commercial and Individual [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 9,321,120 7,445,656
Total non-interest-bearing demand deposits, Percentage of Total 39.70% 36.00%
Correspondent Banks [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 387,048 427,134
Total non-interest-bearing demand deposits, Percentage of Total 1.70% 2.10%
Private Accounts [Member]
   
Deposit [Line Items]    
Savings and interest checking 4,313,781 4,020,313
Money market accounts 7,669,157 6,883,869
Time accounts of $100,000 or more 523,615 508,441
Time accounts under $100,000 458,874 438,800
Total private accounts 12,965,427 11,851,423
Savings and interest checking, Percentage of Total 18.40% 19.40%
Money market accounts, Percentage of Total 32.60% 33.30%
Time accounts of $100,000 or more, Percentage of Total 2.20% 2.50%
Time accounts under $100,000, Percentage of Total 2.00% 2.10%
Total private accounts, Percentage of Total 55.20% 57.30%
Public Funds [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 454,247 438,359
Savings and interest checking 251,303 305,976
Money market accounts 44,284 56,015
Time accounts of $100,000 or more 65,739 160,637
Time accounts under $100,000 1,435 3,586
Total public funds $ 362,761 $ 526,214
Total non-interest-bearing demand deposits, Percentage of Total 1.90% 2.10%
Savings and interest checking, Percentage of Total 1.10% 1.50%
Money market accounts, Percentage of Total 0.10% 0.20%
Time accounts under $100,000, Percentage of Total 0.00% 0.00%
Time accounts of $100,000 or more, Percentage of Total 0.30% 0.80%
Total public funds, Percentage of Total 1.50% 2.50%