Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Borrowings
Shot-term borrowings	$ 700,000	$ 150,000
Long term borrowings	115,936	116,084
Total borrowings	815,936	266,084
Discount	2,700	3,400
Federal Home Loan Bank Rate Credit maturing 3/4/2020
Other Borrowings
Shot-term borrowings	$ 200,000
Fixed interest rate (as a percent)	1.75%
Federal Home Loan Bank Rate Credit maturing 3/19/2020
Other Borrowings
Shot-term borrowings	$ 350,000
Fixed interest rate (as a percent)	1.73%
Federal Home Loan Bank Rate Credit Maturing Three 3/30/2020
Other Borrowings
Shot-term borrowings	$ 150,000
Fixed interest rate (as a percent)	1.72%
Federal Home Loan Bank Short Term Advance 12/31/2019
Other Borrowings
Shot-term borrowings		$ 150,000
Fixed interest rate (as a percent)		2.64%
Short term borrowings
Other Borrowings
Weighted average interest rate (as a percent)	2.35%	2.64%
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	$ 12,372
Fixed interest rate (as a percent)	3.68%	4.58%
SCBT Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	3.68%	4.58%
SCBT Capital Trust III junior subordinated debt
Other Borrowings
Long term borrowings	$ 20,619	$ 20,619
Fixed interest rate (as a percent)	3.48%	4.38%
SAVB Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 6,186	$ 6,186
Fixed interest rate (as a percent)	4.84%	5.29%
SAVB Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	4.09%	4.99%
TSB Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 3,093	$ 3,093
Fixed interest rate (as a percent)	3.61%	4.51%
Southeastern Bank Financial Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	3.29%	4.19%
Southeastern Bank Financial Statutory Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	3.29%	4.19%
CSBC Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 15,464	$ 15,464
Fixed interest rate (as a percent)	3.46%	4.36%
Community Capital Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	3.44%	4.34%
FCRV Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 5,155	$ 5,155
Fixed interest rate (as a percent)	3.59%	4.49%
Provident Community Bancshares Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	3.84%	4.14%
Provident Community Bancshares Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	3.65%	4.48%
Fair Market Value Discount Trust Preferred Debt Acquired
Other Borrowings
Other long term debt acquired	$ (2,730)	$ (3,397)
Other
Other Borrowings
Long term borrowings	103	$ 918
Total borrowings	$ 103
Fixed interest rate (as a percent)	0.50%	4.14%
Long term borrowings
Other Borrowings
Weighted average interest rate (as a percent)	3.60%	4.45%