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Loans and Allowance for Credit Losses - Schedule of Past Due Loans with Age Analysis, Segregated by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days $ 39,635 $ 21,342      
90 or More Days 4,947 331      
Total Past Due Loans 44,582 21,673      
Nonaccrual Loans 10,231 5,382 3,578 4,439 6,079
Current Loans 7,720,408 5,152,885      
Total Loans 7,775,221 5,179,940      
Construction, land development and other land loans [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 6,258 3,863      
90 or More Days 2         
Total Past Due Loans 6,260 3,863      
Nonaccrual Loans 386 1,170      
Current Loans 858,865 545,735      
Total Loans 865,511 550,768      
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 5,634 310      
90 or More Days 218 21      
Total Past Due Loans 5,852 331      
Nonaccrual Loans 62 396      
Current Loans 525,344 284,910      
Total Loans 531,258 285,637      
1-4 Family residential (includes home equity) [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 8,684 2,307      
90 or More Days 2,012 310      
Total Past Due Loans 10,696 2,617      
Nonaccrual Loans 3,086 1,598      
Current Loans 2,117,938 1,438,351      
Total Loans 2,131,720 1,442,566      
Commercial Real Estate (Includes Multi-Family Residential) [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 8,163 9,163      
90 or More Days 1,752         
Total Past Due Loans 9,915 9,163      
Nonaccrual Loans 4,333         
Current Loans 2,739,549 1,981,479      
Total Loans 2,753,797 1,990,642      
Commercial and Industrial [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 9,552 4,843      
90 or More Days 933         
Total Past Due Loans 10,485 4,843      
Nonaccrual Loans 2,208 1,469      
Current Loans 1,267,084 764,802      
Total Loans 1,279,777 771,114      
Consumer and other [Member]
         
Financing Receivable, Recorded Investment, Past Due [Line Items]          
30-89 Days 1,344 856      
90 or More Days 30         
Total Past Due Loans 1,374 856      
Nonaccrual Loans 156 749      
Current Loans 211,628 137,608      
Total Loans $ 213,158 $ 139,213