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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
All loans (non-covered and covered):
Amount of loans	$ 4,114,036	$ 4,043,355	$ 3,290,059
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs (fees)	$ (251)	$ (986)	$ (704)
Total loans	4,113,785	4,042,369	3,289,355
Commercial, financial, and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 411,662	$ 381,130	$ 363,219
Percentage of Loans	10.00%	10.00%	11.00%
Real estate - construction, land development & other land loans [Member]
All loans (non-covered and covered):
Amount of loans	$ 542,960	$ 539,020	$ 424,539
Percentage of Loans	13.00%	13.00%	13.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
All loans (non-covered and covered):
Amount of loans	$ 995,662	$ 972,772	$ 792,791
Percentage of Loans	24.00%	24.00%	24.00%
Real estate - mortgage - home equity loans / lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 373,797	$ 379,978	$ 317,336
Percentage of Loans	9.00%	9.00%	10.00%
Real estate - mortgage - commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	$ 1,718,698	$ 1,696,107	$ 1,335,924
Percentage of Loans	42.00%	42.00%	40.00%
Installment loans to individuals [Member]
All loans (non-covered and covered):
Amount of loans	$ 71,257	$ 74,348	$ 56,250
Percentage of Loans	2.00%	2.00%	2.00%

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