SUBORDINATED DEFERRABLE INTEREST DEBENTURES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2006	Dec. 31, 2005
Securities Financing Transaction [Line Items]
Preferred stock, value, issued	$ 0	$ 0
First National Banc Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized								$ 5,000,000
Preferred stock spread variable dividend rate								2.80%
Trust preferred securities interest rate	4.74%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 5,000,000
Long-term debt, gross	5,155,000
Common stock held in trust	$ 155,000
Prosperity Banking Capital Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized						$ 5,000,000
Preferred stock spread variable dividend rate						2.57%
Trust preferred securities interest rate	4.53%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 5,000,000
Long-term debt, gross	5,155,000
Common stock held in trust	155,000
Subordinated debt obligations, net carrying value	$ 3,670,000
Prosperity Banking Capital Trust II
Securities Financing Transaction [Line Items]
Preferred stock value authorized						$ 4,500,000
Preferred stock spread variable dividend rate						3.15%
Trust preferred securities interest rate	5.10%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 4,500,000
Long-term debt, gross	4,640,000
Common stock held in trust	140,000
Subordinated debt obligations, net carrying value	$ 3,592,000
Prosperity Bank Statutory Trust III
Securities Financing Transaction [Line Items]
Preferred stock value authorized						$ 10,000,000
Preferred stock spread variable dividend rate						1.60%
Trust preferred securities interest rate	3.49%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 10,000,000
Long-term debt, gross	10,310,000
Common stock held in trust	310,000
Subordinated debt obligations, net carrying value	$ 6,241,000
Prosperity Bank Statutory Trust IV
Securities Financing Transaction [Line Items]
Preferred stock value authorized						$ 10,000,000
Preferred stock spread variable dividend rate						1.54%
Trust preferred securities interest rate	3.43%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 5,000,000
Long-term debt, gross	5,155,000
Common stock held in trust	310,000
Subordinated debt obligations, net carrying value	$ 3,587,000
Coastal Bankshares Statutory Trust One
Securities Financing Transaction [Line Items]
Preferred stock value authorized					$ 5,000,000
Preferred stock spread variable dividend rate					3.15%
Trust preferred securities interest rate	5.14%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 5,000,000
Long-term debt, gross	5,155,000
Common stock held in trust	155,000
Subordinated debt obligations, net carrying value	$ 4,091,000
Coastal Bankshares Statutory Trust Two
Securities Financing Transaction [Line Items]
Preferred stock value authorized					$ 10,000,000
Preferred stock spread variable dividend rate					1.60%
Trust preferred securities interest rate	3.49%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 10,000,000
Long-term debt, gross	10,310,000
Common stock held in trust	310,000
Subordinated debt obligations, net carrying value	$ 6,650,000
Merchants & Southern Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized				$ 3,000,000
Preferred stock spread variable dividend rate				1.90%
Trust preferred securities interest rate	3.80%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 3,000,000
Long-term debt, gross	3,093,000
Common stock held in trust	93,000
Subordinated debt obligations, net carrying value	$ 2,131,000
Merchants & Southern Statutory Trust II
Securities Financing Transaction [Line Items]
Preferred stock value authorized				$ 3,000,000
Preferred stock spread variable dividend rate				1.50%
Trust preferred securities interest rate	3.39%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 3,000,000
Long-term debt, gross	3,093,000
Common stock held in trust	93,000
Subordinated debt obligations, net carrying value	$ 1,979,000
Atlantic BancGroup, Inc. Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized			$ 3,000,000
Preferred stock spread variable dividend rate			1.50%
Trust preferred securities interest rate	3.39%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 3,000,000
Long-term debt, gross	3,093,000
Common stock held in trust	93,000
Subordinated debt obligations, net carrying value	$ 1,902,000
Jacksonville Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized			$ 4,000,000
Preferred stock spread variable dividend rate			2.63%
Trust preferred securities interest rate	4.53%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 4,000,000
Long-term debt, gross	4,124,000
Common stock held in trust	124,000
Subordinated debt obligations, net carrying value	$ 3,251,000
Jacksonville Statutory Trust II
Securities Financing Transaction [Line Items]
Preferred stock value authorized			$ 3,000,000
Preferred stock spread variable dividend rate			1.73%
Trust preferred securities interest rate	3.62%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 3,000,000
Long-term debt, gross	3,093,000
Common stock held in trust	93,000
Subordinated debt obligations, net carrying value	$ 2,100,000
Jacksonville Bancorp, Inc. Statutory Trust III
Securities Financing Transaction [Line Items]
Preferred stock value authorized		$ 3,000,000	$ 7,550,000
Preferred stock spread variable dividend rate			3.75%
Trust preferred securities interest rate	5.64%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 7,550,000
Long-term debt, gross	7,784,000
Common stock held in trust	234,000
Subordinated debt obligations, net carrying value	$ 6,730,000
Cherokee Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock spread variable dividend rate		1.50%
Trust preferred securities interest rate	3.39%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 3,093,000
Long-term debt, gross	3,000,000
Common stock held in trust	93,000
Subordinated debt obligations, net carrying value	2,362,000
Fidelity Southern Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock value authorized	$ 15,000,000
Preferred stock spread variable dividend rate	3.10%
Trust preferred securities interest rate	5.05%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 15,000,000
Long-term debt, gross	15,464,000
Common stock held in trust	464,000
Subordinated debt obligations, net carrying value	14,139,000
Fidelity Southern Statutory Trust II
Securities Financing Transaction [Line Items]
Preferred stock value authorized	$ 10,000,000
Preferred stock spread variable dividend rate	1.89%
Trust preferred securities interest rate	3.79%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 10,000,000
Long-term debt, gross	10,310,000
Common stock held in trust	310,000
Subordinated debt obligations, net carrying value	8,120,000
Fidelity Southern Statutory Trust III
Securities Financing Transaction [Line Items]
Preferred stock value authorized	$ 20,000,000
Preferred stock spread variable dividend rate	1.40%
Trust preferred securities interest rate	3.29%
Preferred stock maturity period	30 years
Preferred stock, value, outstanding	$ 20,000,000
Long-term debt, gross	20,619,000
Common stock held in trust	619,000
Subordinated debt obligations, net carrying value	14,746,000
Ameris Statutory Trust I
Securities Financing Transaction [Line Items]
Preferred stock spread variable dividend rate							1.63%
Long-term debt, gross							$ 37,114,000
Common stock held in trust	$ 1,114,000
Preferred stock, value, issued							$ 36,000,000
Preferred stock and debt rate percentage	3.52%