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Deposits - Schedule of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 10,468,605 $ 10,149,061
Total interest-bearing deposits 13,855,792 13,986,869
Total deposits $ 24,324,397 $ 24,135,930
Total non-interest-bearing demand deposits, Percentage of Total 43.00% 42.00%
Total interest-bearing deposits, Percentage of Total 57.00% 58.00%
Total deposits, Percentage of Total 100.00% 100.00%
Commercial and Individual [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 9,496,386 $ 9,256,045
Total non-interest-bearing demand deposits, Percentage of Total 39.00% 38.30%
Correspondent Banks [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 336,918 $ 429,000
Total non-interest-bearing demand deposits, Percentage of Total 1.40% 1.80%
Private Accounts [Member]    
Deposit [Line Items]    
Savings and interest checking $ 4,898,952 $ 4,743,963
Money market accounts 7,647,442 7,860,403
Time accounts of $100,000 or more 428,425 490,209
Time accounts under $100,000 413,938 454,220
Total private accounts $ 13,388,757 $ 13,548,795
Savings and interest checking, Percentage of Total 20.10% 19.70%
Money market accounts, Percentage of Total 31.40% 32.60%
Time accounts of $100,000 or more, Percentage of Total 1.80% 2.00%
Time accounts under $100,000, Percentage of Total 1.70% 1.90%
Total private accounts, Percentage of Total 55.00% 56.20%
Public Funds [Member]    
Deposit [Line Items]    
Total non-interest-bearing demand deposits $ 635,301 $ 464,016
Savings and interest checking 311,474 326,090
Money market accounts 103,961 57,145
Time accounts of $100,000 or more 50,819 53,684
Time accounts under $100,000 781 1,155
Total public funds $ 467,035 $ 438,074
Total non-interest-bearing demand deposits, Percentage of Total 2.60% 1.90%
Savings and interest checking, Percentage of Total 1.30% 1.40%
Money market accounts, Percentage of Total 0.50% 0.20%
Time accounts of $100,000 or more, Percentage of Total 0.20% 0.20%
Time accounts under $100,000, Percentage of Total 0.00% 0.00%
Total public funds, Percentage of Total 2.00% 1.80%