SUBORDINATED DEFERRABLE INTEREST DEBENTURES - Subordinated Deferrable Interest Debentures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Securities Financing Transaction [Line Items]
Issuance Amount	$ 154,390
Unaccreted Purchase Discount	28,062
Carrying Value	$ 126,328
Prosperity Bank Statutory Trust II
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	3.15%
Trust preferred securities interest rate	3.37%
Issuance Amount	$ 4,640
Unaccreted Purchase Discount	890
Carrying Value	$ 3,750
Fidelity Southern Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	3.10%
Trust preferred securities interest rate	3.32%
Issuance Amount	$ 15,464
Unaccreted Purchase Discount	1,129
Carrying Value	$ 14,335
Coastal Bankshares Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	3.15%
Trust preferred securities interest rate	3.27%
Issuance Amount	$ 5,155
Unaccreted Purchase Discount	910
Carrying Value	$ 4,245
Jacksonville Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	2.63%
Trust preferred securities interest rate	2.85%
Issuance Amount	$ 4,124
Unaccreted Purchase Discount	752
Carrying Value	$ 3,372
Prosperity Banking Capital Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	2.57%
Trust preferred securities interest rate	2.79%
Issuance Amount	$ 5,155
Unaccreted Purchase Discount	1,280
Carrying Value	$ 3,875
Merchants & Southern Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.90%
Trust preferred securities interest rate	2.12%
Issuance Amount	$ 3,093
Unaccreted Purchase Discount	836
Carrying Value	$ 2,257
Fidelity Southern Statutory Trust II
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.89%
Trust preferred securities interest rate	2.11%
Issuance Amount	$ 10,310
Unaccreted Purchase Discount	1,903
Carrying Value	$ 8,407
Atlantic BancGroup, Inc. Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.50%
Trust preferred securities interest rate	1.70%
Issuance Amount	$ 3,093
Unaccreted Purchase Discount	1,061
Carrying Value	$ 2,032
Coastal Bankshares Statutory Trust II
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.60%
Trust preferred securities interest rate	1.80%
Issuance Amount	$ 10,310
Unaccreted Purchase Discount	3,199
Carrying Value	$ 7,111
Cherokee Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.50%
Trust preferred securities interest rate	1.70%
Issuance Amount	$ 3,093
Unaccreted Purchase Discount	640
Carrying Value	$ 2,453
Prosperity Bank Statutory Trust III
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.60%
Trust preferred securities interest rate	1.80%
Issuance Amount	$ 10,310
Unaccreted Purchase Discount	3,563
Carrying Value	$ 6,747
Merchants & Southern Statutory Trust II
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.50%
Trust preferred securities interest rate	1.70%
Issuance Amount	$ 3,093
Unaccreted Purchase Discount	977
Carrying Value	$ 2,116
Jacksonville Statutory Trust II
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.73%
Trust preferred securities interest rate	1.93%
Issuance Amount	$ 3,093
Unaccreted Purchase Discount	875
Carrying Value	$ 2,218
Ameris Statutory Trust I
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.63%
Trust preferred securities interest rate	1.83%
Issuance Amount	$ 37,114
Unaccreted Purchase Discount	0
Carrying Value	$ 37,114
Fidelity Southern Statutory Trust III
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.40%
Trust preferred securities interest rate	1.60%
Issuance Amount	$ 20,619
Unaccreted Purchase Discount	5,211
Carrying Value	$ 15,408
Prosperity Bank Statutory Trust IV
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	1.54%
Trust preferred securities interest rate	1.74%
Issuance Amount	$ 7,940
Unaccreted Purchase Discount	3,897
Carrying Value	$ 4,043
Jacksonville Bancorp, Inc. Statutory Trust III
Securities Financing Transaction [Line Items]
Trust preferred securities, variable basis spread	3.75%
Trust preferred securities interest rate	3.95%
Issuance Amount	$ 7,784
Unaccreted Purchase Discount	939
Carrying Value	$ 6,845