Other Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Borrowings
Shot-term borrowings	$ 100,000,000
Long term borrowings	116,385,000	$ 55,358,000
Total borrowings	216,385,000	$ 55,358,000
Weighted average interest rate (as a percent)		2.84%
Discount		$ 213,000
Federal Home Loan Bank Rate Credit maturing 04/27/2018
Other Borrowings
Shot-term borrowings	$ 50,000,000
Fixed interest rate (as a percent)	1.57%
Federal Home Loan Bank Rate Credit maturing 01/16/2018
Other Borrowings
Shot-term borrowings	$ 50,000,000
Fixed interest rate (as a percent)	1.40%
Short term borrowings
Other Borrowings
Weighted average interest rate (as a percent)	1.48%
LIBOR | Minimum
Other Borrowings
Spread on variable rate basis (as a percent)	140.00%
LIBOR | Maximum
Other Borrowings
Spread on variable rate basis (as a percent)	285.00%
SCBT Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 12,372,000	$ 12,372,000
Fixed interest rate (as a percent)	3.38%	2.75%
SCBT Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248,000	$ 8,248,000
Fixed interest rate (as a percent)	3.38%	2.75%
SCBT Capital Trust III junior subordinated debt
Other Borrowings
Long term borrowings	$ 20,619,000	$ 20,619,000
Fixed interest rate (as a percent)	3.18%	2.55%
SAVB Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 6,186,000	$ 6,186,000
Fixed interest rate (as a percent)	4.21%	3.73%
SAVB Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124,000	$ 4,124,000
Fixed interest rate (as a percent)	3.79%	3.16%
TSB Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 3,093,000	$ 3,093,000
Fixed interest rate (as a percent)	3.31%	2.68%
Southeastern Bank Financial Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310,000
Fixed interest rate (as a percent)	2.99%
Southeastern Bank Financial Statutory Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310,000
Fixed interest rate (as a percent)	2.99%
CSBC Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 15,464,000
Fixed interest rate (as a percent)	3.16%
Community Capital Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310,000
Fixed interest rate (as a percent)	3.14%
FCRV Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 5,155,000
Fixed interest rate (as a percent)	3.29%
Provident Community Bancshares Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124,000
Fixed interest rate (as a percent)	3.08%
Provident Community Bancshares Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248,000
Fixed interest rate (as a percent)	3.22%
Fair Market Value Discount Trust Preferred Debt Acquired
Other Borrowings
Other long term debt acquired	$ (4,063,000)	$ (213,000)
Other
Other Borrowings
Long term borrowings	1,885,000	$ 929,000
Total borrowings	$ 1,885,000
Fixed interest rate (as a percent)	4.09%	4.07%
Long term borrowings
Other Borrowings
Weighted average interest rate (as a percent)	3.26%