SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Estimated Useful Lives (Details) - Maximum	12 Months Ended
	Dec. 31, 2019
Bank Buildings
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Software
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Automobiles
Property, Plant and Equipment [Line Items]
Estimated useful life	4 years