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Acquisitions and Intangibles (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mid-America Bancshares, Inc [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Number of bank owned by holding company 2    
Period of amortization for remaining adjustment 5 years    
Mid-America Bancshares, Inc [Member] | Core Deposits [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Acquired finite-lived intangible asset $ 9,400,000    
Amortization period of intangible assets 10 years    
Amortization of acquired intangible assets 987,000 1,026,000 1,062,000
Mid-America Bancshares, Inc [Member] | Core Deposits [Member] | Minimum [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 700,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 700,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 700,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 700,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 700,000    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 700,000    
Mid-America Bancshares, Inc [Member] | Core Deposits [Member] | Maximum [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 1,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1,200,000    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 1,200,000    
Cavalry Bancorp, Inc [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Number of bank owned by holding company 1    
Cavalry Bancorp, Inc [Member] | Core Deposits [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Acquired finite-lived intangible asset 13,200,000    
Amortization period of intangible assets 7 years    
Amortization of acquired intangible assets 1,600,000 1,700,000 1,800,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 273,000    
Beach & Gentry Insurance LLC [Member] | Customer Lists [Member]
     
Acquired Finite-Lived Intangible Assets [Line Items]      
Acquired finite-lived intangible asset 1,270,000    
Amortization period of intangible assets 20 years    
Amortization of acquired intangible assets $ 103,000 $ 109,000 $ 115,000