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Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Borrowings
Long term borrowings	$ 327,066	$ 390,179
Total borrowings	327,066	390,179
Short term borrowings, Average balance	1,986	745,939
Long term borrowings, Average balance	352,813	271,493
Total borrowings, Average balance	$ 354,799	$ 1,017,432
Fixed interest rate (as a percent)	4.40%	4.40%
Weighted average interest rate (as a percent)	4.35%	1.58%
Junior subordinated debt securities	$ 117,200	$ 144,300
Short term borrowings
Other Borrowings
Weighted average interest rate (as a percent)	2.22%	0.63%
SCBT Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 12,372	$ 12,372
Fixed interest rate (as a percent)	1.99%	2.01%
SCBT Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	1.99%	2.01%
SCBT Capital Trust III junior subordinated debt
Other Borrowings
Long term borrowings	$ 20,619	$ 20,619
Fixed interest rate (as a percent)	1.79%	1.81%
SAVB Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 6,186	$ 6,186
Fixed interest rate (as a percent)	2.97%	3.09%
SAVB Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	2.40%	2.42%
TSB Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 3,093	$ 3,093
Fixed interest rate (as a percent)	1.92%	1.94%
Southeastern Bank Financial Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.60%	1.62%
Southeastern Bank Financial Statutory Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.60%	1.62%
CSBC Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 15,464	$ 15,464
Fixed interest rate (as a percent)	1.77%	1.79%
Community Capital Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.75%	1.77%
FCRV Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 5,155	$ 5,155
Fixed interest rate (as a percent)	1.90%	1.92%
Provident Community Bancshares Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	1.87%	1.97%
Provident Community Bancshares Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	1.91%	1.97%
CenterState Banks of Florida Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings		$ 10,310
Fixed interest rate (as a percent)		3.30%
Valrico Capital Statutory Trust junior subordinated debt
Other Borrowings
Long term borrowings		$ 2,577
Fixed interest rate (as a percent)		2.93%
Federal Trust Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings		$ 5,155
Fixed interest rate (as a percent)		3.18%
Gulfstream Bancshares Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings		$ 3,093
Fixed interest rate (as a percent)		1.93%
Homestead Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings		$ 10,495
Fixed interest rate (as a percent)		1.88%
BSA Financial Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings		$ 5,155
Fixed interest rate (as a percent)		1.77%
MRCB Statutory Trust II junior subordinated debt
Other Borrowings
Long term borrowings		$ 3,093
Fixed interest rate (as a percent)		1.82%
Fair Market Value Discount Trust Preferred Debt Acquired
Other Borrowings
Other long term debt acquired	$ (1,398)	$ (14,116)
Junior Subordinated Debt
Other Borrowings
Long term borrowings	117,165	144,325
Long term borrowings, Average balance	$ 130,048	$ 131,817
Fixed interest rate (as a percent)	1.89%	2.05%
Weighted average interest rate (as a percent)	1.97%	2.51%
Junior subordinated debt securities	$ 117,200
Junior Subordinated Debt | LIBOR | Minimum
Other Borrowings
Spread on variable rate basis (as a percent)	1.40%
Junior Subordinated Debt | LIBOR | Maximum
Other Borrowings
Spread on variable rate basis (as a percent)	2.85%
Residential Warranty Corp. subordinated note
Other Borrowings
Long term borrowings		$ 7,000
Fixed interest rate (as a percent)		5.00%
Messiah College subordinated note
Other Borrowings
Long term borrowings		$ 4,000
Fixed interest rate (as a percent)		5.00%
National Bank of Commerce subordinated debt
Other Borrowings
Long term borrowings		$ 25,000
Fixed interest rate (as a percent)	6.00%	6.00%
National Bank of Commerce subordinated debt | LIBOR
Other Borrowings
Spread on variable rate basis (as a percent)	4.79%
Landmark Bancshares subordinated debt
Other Borrowings
Long term borrowings	$ 13,000	$ 13,000
Fixed interest rate (as a percent)	6.50%	6.50%
Landmark Bancshares subordinated debt | LIBOR
Other Borrowings
Spread on variable rate basis (as a percent)	4.67%
CenterState Bank Corporation subordinated debt
Other Borrowings
Long term borrowings	$ 200,000	$ 200,000
Debt issuance cost	$ (3,100)	$ (3,100)
Fixed interest rate (as a percent)	5.75%	5.75%
CenterState Bank Corporation subordinated debt | LIBOR
Other Borrowings
Fixed interest rate (as a percent)	5.75%
Spread on variable rate basis (as a percent)	5.62%
Long-term subordinated debt costs
Other Borrowings
Debt issuance cost	$ (3,099)	$ (3,146)
Subordinated Debt.
Other Borrowings
Long term borrowings	209,901	245,854
Long term borrowings, Average balance	$ 222,765	$ 139,584
Fixed interest rate (as a percent)	5.80%	5.78%
Weighted average interest rate (as a percent)	5.81%	5.69%
Other.
Other Borrowings
Long term borrowings, Average balance		$ 92
Weighted average interest rate (as a percent)		0.50%
Long term borrowings
Other Borrowings
Fixed interest rate (as a percent)		4.40%
Weighted average interest rate (as a percent)	4.36%	3.60%

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