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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
All loans (non-covered and covered):
Amount of loans	$ 4,190,139	$ 4,043,355	$ 3,430,192
Percentage of Loans	100.00%	100.00%	100.00%
Unamortized net deferred loan costs (fees)	$ 489	$ (986)	$ (437)
Total loans	4,190,628	4,042,369	3,429,755
Commercial, financial, and agricultural [Member]
All loans (non-covered and covered):
Amount of loans	$ 435,730	$ 381,130	$ 376,940
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	$ 559,450	$ 539,020	$ 450,746
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	$ 1,038,436	$ 972,772	$ 796,222
Percentage of Loans	25.00%	24.00%	23.00%
Real estate - mortgage - home equity loans / lines of credit [Member]
All loans (non-covered and covered):
Amount of loans	$ 362,829	$ 379,978	$ 315,322
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	$ 1,723,598	$ 1,696,107	$ 1,431,934
Percentage of Loans	41.00%	42.00%	41.00%
Installment loans to individuals [Member]
All loans (non-covered and covered):
Amount of loans	$ 70,096	$ 74,348	$ 59,028
Percentage of Loans	2.00%	2.00%	2.00%

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