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Other Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Borrowings
Shot-term borrowings	$ 0	$ 700,000
Long term borrowings	390,179	115,936
Total borrowings	390,179	815,936
Short term borrowings, Average balance	745,939	538,627
Long term borrowings, Average balance	271,493	116,126
Total borrowings, Average balance	$ 1,017,432	$ 654,753
Fixed interest rate (as a percent)	4.40%	2.00%
Weighted average interest rate (as a percent)	1.58%	2.57%
Junior subordinated debt securities	$ 144,300	$ 115,800
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%
Short term borrowings
Other Borrowings
Fixed interest rate (as a percent)		1.73%
Weighted average interest rate (as a percent)	0.63%	2.35%
SCBT Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 12,372	$ 12,372
Fixed interest rate (as a percent)	2.01%	3.68%
SCBT Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	2.01%	3.68%
SCBT Capital Trust III junior subordinated debt
Other Borrowings
Long term borrowings	$ 20,619	$ 20,619
Fixed interest rate (as a percent)	1.81%	3.48%
SAVB Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 6,186	$ 6,186
Fixed interest rate (as a percent)	3.09%	4.84%
SAVB Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	2.42%	4.09%
TSB Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 3,093	$ 3,093
Fixed interest rate (as a percent)	1.94%	3.61%
Southeastern Bank Financial Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.62%	3.29%
Southeastern Bank Financial Statutory Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.62%	3.29%
CSBC Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 15,464	$ 15,464
Fixed interest rate (as a percent)	1.79%	3.46%
Community Capital Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 10,310	$ 10,310
Fixed interest rate (as a percent)	1.77%	3.44%
FCRV Statutory Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 5,155	$ 5,155
Fixed interest rate (as a percent)	1.92%	3.59%
Provident Community Bancshares Capital Trust I junior subordinated debt
Other Borrowings
Long term borrowings	$ 4,124	$ 4,124
Fixed interest rate (as a percent)	1.97%	3.84%
Provident Community Bancshares Capital Trust II junior subordinated debt
Other Borrowings
Long term borrowings	$ 8,248	$ 8,248
Fixed interest rate (as a percent)	1.97%	3.65%
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 [Member]
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	$ (14,116)	$ (2,730)
Junior Subordinated Debt
Other Borrowings
Long term borrowings	144,325	115,833
Long term borrowings, Average balance	$ 131,817	$ 115,490
Fixed interest rate (as a percent)	2.05%	3.60%
Weighted average interest rate (as a percent)	2.51%	4.20%
Junior Subordinated Debt | LIBOR | Minimum
Other Borrowings
Spread on variable rate basis (as a percent)	140.00%
Junior Subordinated Debt | LIBOR | Maximum
Other Borrowings
Spread on variable rate basis (as a percent)	305.00%
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%
National Bank of Commerce subordinated debt | LIBOR
Other Borrowings
Spread on variable rate basis (as a percent)	479.00%
Landmark Bancshares subordinated debt
Other Borrowings
Long term borrowings	$ 13,000
Fixed interest rate (as a percent)	6.50%
Landmark Bancshares subordinated debt | LIBOR
Other Borrowings
Spread on variable rate basis (as a percent)	467.00%
CenterState Bank Corporation subordinated debt
Other Borrowings
Long term borrowings	$ 200,000
Debt issuance cost	$ (3,100)
Fixed interest rate (as a percent)	5.75%
Junior subordinated debt securities	$ 196,900
CenterState Bank Corporation subordinated debt | LIBOR
Other Borrowings
Fixed interest rate (as a percent)	5.75%
Spread on variable rate basis (as a percent)	562.00%
Subordinated Debt
Other Borrowings
Long term borrowings	$ 245,854
Debt issuance cost	(3,146)
Long term borrowings, Average balance	$ 139,584
Fixed interest rate (as a percent)	5.78%
Weighted average interest rate (as a percent)	5.69%
Other
Other Borrowings
Long term borrowings		$ 103
Long term borrowings, Average balance	$ 92	$ 636
Fixed interest rate (as a percent)		0.50%
Weighted average interest rate (as a percent)	0.50%	6.02%
Long term borrowings
Other Borrowings
Fixed interest rate (as a percent)		3.60%
Weighted average interest rate (as a percent)	3.60%	3.60%

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