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Deposits - Schedule of Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 9,507,581 $ 8,311,149
Total interest-bearing deposits 13,009,025 12,377,637
Total deposits 22,516,606 20,688,786
Total non-interest-bearing demand deposits, Percentage of Total 42.20% 40.20%
Total interest-bearing deposits, Percentage of Total 57.80% 59.80%
Total deposits, Percentage of Total 100.00% 100.00%
Commercial and Individual [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 8,711,011 7,445,656
Total non-interest-bearing demand deposits, Percentage of Total 38.70% 36.00%
Correspondent Banks [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 409,839 427,134
Total non-interest-bearing demand deposits, Percentage of Total 1.80% 2.10%
Private Accounts [Member]
   
Deposit [Line Items]    
Savings and interest checking 4,221,278 4,020,313
Money market accounts 7,348,003 6,883,869
Time accounts of $100,000 or more 568,487 508,441
Time accounts under $100,000 473,711 438,800
Total private accounts 12,611,479 11,851,423
Savings and interest checking, Percentage of Total 18.80% 19.40%
Money market accounts, Percentage of Total 32.60% 33.30%
Time accounts of $100,000 or more, Percentage of Total 2.50% 2.50%
Time accounts under $100,000, Percentage of Total 2.10% 2.10%
Total private accounts, Percentage of Total 56.00% 57.30%
Public Funds [Member]
   
Deposit [Line Items]    
Total non-interest-bearing demand deposits 386,731 438,359
Savings and interest checking 250,579 305,976
Money market accounts 55,749 56,015
Time accounts of $100,000 or more 87,045 160,637
Time accounts under $100,000 4,173 3,586
Total public funds $ 397,546 $ 526,214
Total non-interest-bearing demand deposits, Percentage of Total 1.70% 2.10%
Savings and interest checking, Percentage of Total 1.10% 1.50%
Money market accounts, Percentage of Total 0.30% 0.20%
Time accounts under $100,000, Percentage of Total 0.00% 0.00%
Time accounts of $100,000 or more, Percentage of Total 0.40% 0.80%
Total public funds, Percentage of Total 1.80% 2.50%