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Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Analysis of the payment status of loans      
Nonaccrual loans $ 25,684 $ 27,468 $ 41,411
Current  
Total loans 3,289,355 2,710,712 2,439,830
Unamortized net deferred loan costs (704) (49) 1,258
Total loans 3,289,355 2,710,712 $ 2,539,353
Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,368 1,842  
Real estate construction, land development & other land loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,607 2,945  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 15,833 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 2,238 2,355  
Real estate mortgage commercial and other [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 4,577 4,208  
Installment loans to individuals [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 61 101  
All Total Loans [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 25,684 27,468  
Current 3,243,085 2,673,391  
Total loans 3,290,059 2,710,761  
Total loans   2,710,712  
All Total Loans [Member] | 30-59 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 17,846 8,471  
All Total Loans [Member] | 60-89 Days past due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 1,700 1,431  
All Total Loans [Member] | 90 Days or More Past Due [Member]      
Analysis of the payment status of loans      
Financing receivable, past due 1,744    
All Total Loans [Member] | Commercial, financial, and agricultural [Member]      
Analysis of the payment status of loans      
Nonaccrual loans 1,368 1,842  
Current 360,633 259,879  
Total loans 362,936 261,813  
Total loans    
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 519 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 416  
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 1,607 2,945  
Current 421,003 351,081  
Total loans 424,085 354,667  
Total loans    
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 1,309 473  
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 166 168  
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 15,833 16,017  
Current 760,896 729,732  
Total loans 789,114 750,679  
Total loans    
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 11,794 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 591 443  
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 2,238 2,355  
Current 313,526 234,821  
Total loans 316,593 239,105  
Total loans    
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 586 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 243 178  
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 4,577 4,208  
Current 1,313,638 1,043,321  
Total loans 1,321,416 1,049,460  
Total loans    
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 3,123 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 78 449  
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 61 101  
Current 55,853 51,557  
Total loans 56,250 55,037  
Total loans    
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 192 186  
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 144 193  
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 17,536 514  
Total loans 19,665 514  
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 323  
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 62  
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 $ 1,744