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Loans and Allowance for Credit Losses - Schedule of Contractual Maturities of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value $ 7,906,303
Loans with a predetermined interest rate 3,451,196
Loans with a floating interest rate 4,455,107
Total 7,906,303
Commercial and Industrial [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 1,313,108
Construction, land development and other land loans [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 874,758
1-4 Family residential (includes home equity) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 2,141,379
Commercial (includes multi-family residential) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 2,822,661
Agriculture (includes farmland) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 539,269
Consumer and other [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 215,128
One Year Or Less [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 1,171,082
Loans with a predetermined interest rate 373,155
Loans with a floating interest rate 797,927
Total 1,171,082
One Year Or Less [Member] | Commercial and Industrial [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 505,151
One Year Or Less [Member] | Construction, land development and other land loans [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 280,838
One Year Or Less [Member] | 1-4 Family residential (includes home equity) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 30,352
One Year Or Less [Member] | Commercial (includes multi-family residential) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 113,892
One Year Or Less [Member] | Agriculture (includes farmland) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 172,535
One Year Or Less [Member] | Consumer and other [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 68,314
After One Through Five Years [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 1,445,943
Loans with a predetermined interest rate 721,115
Loans with a floating interest rate 724,828
Total 1,445,943
After One Through Five Years [Member] | Commercial and Industrial [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 472,113
After One Through Five Years [Member] | Construction, land development and other land loans [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 172,245
After One Through Five Years [Member] | 1-4 Family residential (includes home equity) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 134,488
After One Through Five Years [Member] | Commercial (includes multi-family residential) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 498,971
After One Through Five Years [Member] | Agriculture (includes farmland) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 72,384
After One Through Five Years [Member] | Consumer and other [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 95,742
After Five Years [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 5,289,278
Loans with a predetermined interest rate 2,356,926
Loans with a floating interest rate 2,932,352
Total 5,289,278
After Five Years [Member] | Commercial and Industrial [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 335,844
After Five Years [Member] | Construction, land development and other land loans [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 421,675
After Five Years [Member] | 1-4 Family residential (includes home equity) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 1,976,539
After Five Years [Member] | Commercial (includes multi-family residential) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 2,209,798
After Five Years [Member] | Agriculture (includes farmland) [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value 294,350
After Five Years [Member] | Consumer and other [Member]
 
Financing Receivable, Allowance for Credit Losses [Line Items]  
Loans receivable gross of acquired loan discount and fair value $ 51,072