Summary of Significant Accounting Policies - Operations, Segments - (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) item
Nature of Operations
Number of unconsolidated subsidiaries | item	6
Trust preferred securities to be issued	$ 53.0
Maximum
Segments
Number of reportable operating segments | item	1
SCBT Capital Trust I
Nature of Operations
Trust preferred securities to be issued	$ 12.0
SCBT Capital Trust II
Nature of Operations
Trust preferred securities to be issued	8.0
SCBT Capital Trust III
Nature of Operations
Trust preferred securities to be issued	20.0
TSB Statutory Trust I
Nature of Operations
Trust preferred securities to be issued	3.0
SAVB Capital Trust I
Nature of Operations
Trust preferred securities to be issued	6.0
SAVB Capital Trust II
Nature of Operations
Trust preferred securities to be issued	$ 4.0
South Carolina
Nature of Operations
Number of counties | item	24
North Carolina
Nature of Operations
Number of counties | item	4
Northeast Georgia
Nature of Operations
Number of counties | item	11
Coastal Georgia
Nature of Operations
Number of counties | item	2