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Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Analysis of the payment status of loans      
Nonaccrual loans $ 22,795 $ 27,468 $ 37,975
Total loans 3,375,976 2,710,712 2,598,134
Unamortized net deferred loan costs (808) (49) 1,074
Total loans 3,375,976 2,710,712 $ 2,598,134
Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,027 1,842  
Real estate construction, land development & other land loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,007 2,945  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 15,262 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,942 2,355  
Real estate mortgage commercial and other [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 3,451 4,208  
Installment loans to individuals [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 106 101  
All Total Loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 22,795 27,468  
Current 3,343,883 2,673,391  
Total loans 3,376,784    
Unamortized net deferred loan costs (808) (49)  
Total loans 3,375,976 2,710,712  
All Total Loans [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 6,482 8,471  
All Total Loans [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 3,194 1,431  
All Total Loans [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 430    
All Total Loans [Member] | Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,027 1,842  
Current 382,282 259,879  
Total loans 383,565 261,813  
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 236 92  
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 20  
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 1,007 2,945  
Current 443,985 351,081  
Total loans 446,206 354,667  
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 1,040 473  
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 174 168  
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 15,262 16,017  
Current 759,414 729,732  
Total loans 780,307 750,679  
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 2,847 4,487  
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 2,784 443  
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 1,942 2,355  
Current 317,214 234,821  
Total loans 320,228 239,105  
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 1,018 1,751  
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 54 178  
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 3,451 4,208  
Current 1,368,065 1,042,807  
Total loans 1,372,682 1,048,946  
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 1,094 1,482  
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 72 449  
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 106 101  
Current 56,644 54,557  
Total loans 56,950 55,037  
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 115 186  
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 85 193  
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 16,279 514  
Total loans 16,846 514  
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 132  
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 5  
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 $ 430