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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
All loans (non-covered and covered):
Amount of loans	$ 4,043,355	$ 2,710,761
Percentage of Loans	100.00%	100.00%
Unamortized net deferred loan costs (fees)	$ (986)	$ (49)
Total loans	4,042,369	2,710,712
Commercial, financial, and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 381,130	$ 261,813
Percentage of Loans	10.00%	9.00%
Real estate - construction, land development & other land loans [Member]
All loans (non-covered and covered):
Amount of loans	$ 539,020	$ 354,667
Percentage of Loans	13.00%	13.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
All loans (non-covered and covered):
Amount of loans	$ 972,772	$ 750,679
Percentage of Loans	24.00%	28.00%
Real estate - mortgage - home equity loans / lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 379,978	$ 239,105
Percentage of Loans	9.00%	9.00%
Real estate - mortgage - commercial and other [Member]
All loans (non-covered and covered):
Amount of loans	$ 1,696,107	$ 1,049,460
Percentage of Loans	42.00%	39.00%
Installment loans to individuals [Member]
All loans (non-covered and covered):
Amount of loans	$ 74,348	$ 55,037
Percentage of Loans	2.00%	2.00%

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