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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Company's nonaccrual loans:      
Nonaccrual loans $ 32,796 $ 47,810 $ 47,720
Commercial, financial, and agricultural [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,253 2,964 2,852
Real estate construction, land development & other land loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 3,858 4,704 5,434
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 17,989 23,829 25,206
Real estate mortgage home equity loans / lines of credit [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,441 3,525 2,472
Real estate mortgage commercial and other [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 6,151 12,571 11,398
Installment loans to individuals [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 104 217 358
Covered [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 7,816 5,373
All Total Loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 32,796 47,810 $ 47,720
All Total Loans [Member] | Commercial, financial, and agricultural [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,253 2,964  
All Total Loans [Member] | Real estate construction, land development & other land loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 3,858 4,704  
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 17,989 23,829  
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,441 3,525  
All Total Loans [Member] | Real estate mortgage commercial and other [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 6,151 12,571  
All Total Loans [Member] | Installment loans to individuals [Member]      
Company's nonaccrual loans:      
Nonaccrual loans $ 104 $ 217