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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Company's nonaccrual loans:    
Nonaccrual loans $ 37,975 $ 47,810
Commercial, financial, and agricultural [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,870 2,964
Real estate construction, land development & other land loans [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 4,154 4,704
Real estate mortgage residential (1-4 family) first mortgages [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 21,156 23,829
Real estate mortgage home equity loans / lines of credit [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,759 3,525
Real estate mortgage commercial and other [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 6,821 12,571
Installment loans to individuals [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 215 217
Non-covered [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 33,781 39,994
Non-covered [Member] | Commercial, financial, and agricultural [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,870 2,964
Non-covered [Member] | Real estate construction, land development & other land loans [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 4,154 4,652
Non-covered [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 17,315 18,822
Non-covered [Member] | Real estate mortgage home equity loans / lines of credit [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,406 3,142
Non-covered [Member] | Real estate mortgage commercial and other [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 6,821 10,197
Non-covered [Member] | Installment loans to individuals [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 215 217
Covered [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 4,194 7,816
Covered [Member] | Commercial, financial, and agricultural [Member]    
Company's nonaccrual loans:    
Nonaccrual loans
Covered [Member] | Real estate construction, land development & other land loans [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 52
Covered [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 3,841 5,007
Covered [Member] | Real estate mortgage home equity loans / lines of credit [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 353 383
Covered [Member] | Real estate mortgage commercial and other [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,374
Covered [Member] | Installment loans to individuals [Member]    
Company's nonaccrual loans:    
Nonaccrual loans