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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
All loans (non-covered and covered):
Amount of loans	$ 4,302,163	$ 4,247,765	$ 4,114,036
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs (fees)	$ 1,624	$ 1,299	$ (251)
Total loans	4,303,787	4,249,064	4,113,785
Commercial, financial, and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 468,388	$ 457,037	$ 411,662
Percentage of Loans	11.00%	11.00%	10.00%
Real estate - construction, land development & other land loans [Member]
All loans (non-covered and covered):
Amount of loans	$ 553,760	$ 518,976	$ 542,960
Percentage of Loans	13.00%	12.00%	13.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
All loans (non-covered and covered):
Amount of loans	$ 1,061,049	$ 1,054,176	$ 995,662
Percentage of Loans	25.00%	25.00%	24.00%
Real estate - mortgage - home equity loans / lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 354,669	$ 359,162	$ 373,797
Percentage of Loans	8.00%	8.00%	9.00%
Real estate - mortgage - commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	$ 1,794,794	$ 1,787,022	$ 1,718,698
Percentage of Loans	42.00%	42.00%	42.00%
Installment loans to individuals [Member]
All loans (non-covered and covered):
Amount of loans	$ 69,503	$ 71,392	$ 71,257
Percentage of Loans	1.00%	2.00%	2.00%

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