SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Federal reserve bank required reserve	$ 75,600
Other real estate owned	$ 7,299	$ 10,869
Useful life of intangible assets	10 years
Advertising expense	$ 648	382	$ 336
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		348
Payments to Acquire Limited Partnership Interests	$ 4,400
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of Total Loans	0.68%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of Total Loans	1.39%
Building [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Furniture and Fixtures [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Limited Partner [Member]
Summary Of Significant Accounting Policies [Line Items]
Real Estate Investments	$ 3,000	$ 3,400
Affordable Housing Tax Credits And Other Tax Benefits	$ 481