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Loans and Asset Quality Information (Schedule of Analysis of Payment Status of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Analysis of the payment status of loans
Nonaccrual loans	$ 23,350	$ 27,468	$ 32,796
Total loans	3,429,755	2,710,712	2,651,459
Unamortized net deferred loan fees	(437)	(49)	198
Total loans	3,429,755	2,710,712	$ 2,651,459
Commercial, financial, and agricultural [Member]
Analysis of the payment status of loans
Nonaccrual loans	996	1,842
Real estate construction, land development & other land loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	1,565	2,945
Real estate mortgage residential (1-4 family) first mortgages [Member]
Analysis of the payment status of loans
Nonaccrual loans	14,878	16,017
Real estate mortgage home equity loans / lines of credit [Member]
Analysis of the payment status of loans
Nonaccrual loans	2,250	2,355
Real estate mortgage commercial and other [Member]
Analysis of the payment status of loans
Nonaccrual loans	3,534	4,208
Installment loans to individuals [Member]
Analysis of the payment status of loans
Nonaccrual loans	127	101
All Total Loans [Member]
Analysis of the payment status of loans
Nonaccrual loans	23,350	27,468
Current	3,395,400	2,673,391
Total loans	3,430,192	2,710,761
Unamortized net deferred loan fees	(437)	(49)
Total loans	3,429,755	2,710,712
All Total Loans [Member] | 30-59 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	9,973	8,471
All Total Loans [Member] | 60-89 Days past due [Member]
Analysis of the payment status of loans
Financing receivable, past due	1,020	1,431
All Total Loans [Member] | 90 Days or More Past Due [Member]
Analysis of the payment status of loans
Financing receivable, past due	449
All Total Loans [Member] | Commercial, financial, and agricultural [Member]
Analysis of the payment status of loans
Nonaccrual loans	996	1,842
Current	375,364	259,879
Total loans	376,685	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	325	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
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	1,565	2,945
Current	447,873	351,081
Total loans	449,870	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	432	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		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	14,878	16,017
Current	772,651	729,732
Total loans	792,912	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	4,911	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	472	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	2,250	2,355
Current	309,906	234,821
Total loans	314,611	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	2,455	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		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	3,534	4,208
Current	1,417,012	1,042,807
Total loans	1,422,109	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	469	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	127	101
Current	58,620	54,557
Total loans	58,971	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	145	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	79	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	13,974	514
Total loans	15,034	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	611
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
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	$ 449

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