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Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Analysis of the payment status of loans      
Nonaccrual loans $ 21,849 $ 20,968 $ 25,684
Total loans 4,113,785 4,042,369 3,289,355
Unamortized net deferred loan fees (251) (986) (704)
Total loans 4,113,785 4,042,369 $ 3,289,355
Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 801 1,001  
Real estate construction, land development & other land loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,766 1,822  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 12,073 12,201  
Real estate mortgage home equity loans / lines of credit [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,980 2,524  
Real estate mortgage commercial and other [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 5,119 3,345  
Installment loans to individuals [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 110 75  
All Total Loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 21,849 20,968  
Current 4,077,619 4,007,515  
Total loans 4,114,036 4,043,355  
Unamortized net deferred loan fees (251) (986)  
Total loans 4,113,785 4,042,369  
All Total Loans [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 12,343 11,903  
All Total Loans [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 1,741 2,368  
All Total Loans [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 484 601  
All Total Loans [Member] | Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 801 1,001  
Current 410,223 379,241  
Total loans 411,248 380,482  
All Total Loans [Member] | Commercial, financial, and agricultural [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 59 89  
All Total Loans [Member] | Commercial, financial, and agricultural [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 165 151  
All Total Loans [Member] | Commercial, financial, and agricultural [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Real estate construction, land development & other land loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,766 1,822  
Current 539,702 535,423  
Total loans 542,560 538,613  
All Total Loans [Member] | Real estate construction, land development & other land loans [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 997 1,154  
All Total Loans [Member] | Real estate construction, land development & other land loans [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 95 214  
All Total Loans [Member] | Real estate construction, land development & other land loans [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 12,073 12,201  
Current 967,993 943,565  
Total loans 987,333 963,913  
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 6,852 6,777  
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 415 1,370  
All Total Loans [Member] | Real estate mortgage residential (1-4 family) first mortgages [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,980 2,524  
Current 370,956 375,814  
Total loans 373,524 379,695  
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 578 1,347  
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 10 10  
All Total Loans [Member] | Real estate mortgage home equity loans / lines of credit [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Real estate mortgage commercial and other [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 5,119 3,345  
Current 1,697,506 1,678,529  
Total loans 1,706,382 1,683,595  
All Total Loans [Member] | Real estate mortgage commercial and other [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 2,771 1,270  
All Total Loans [Member] | Real estate mortgage commercial and other [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 986 451  
All Total Loans [Member] | Real estate mortgage commercial and other [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Installment loans to individuals [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 110 75  
Current 70,168 73,277  
Total loans 70,842 73,892  
All Total Loans [Member] | Installment loans to individuals [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 503 445  
All Total Loans [Member] | Installment loans to individuals [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 61 95  
All Total Loans [Member] | Installment loans to individuals [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due  
All Total Loans [Member] | Purchased credit impaired [Member]      
Analysis of the payment status of loans      
Nonaccrual loans  
Current 21,071 21,666  
Total loans 22,147 23,165  
All Total Loans [Member] | Purchased credit impaired [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 583 821  
All Total Loans [Member] | Purchased credit impaired [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 9 77  
All Total Loans [Member] | Purchased credit impaired [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due $ 484 $ 601