SIGNIFICANT ACCOUNTING POLICIES - Other Information (Details)		1 Months Ended	12 Months Ended
	Aug. 30, 2019	Oct. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Shares sold			$ 13,911,000
Proceeds received, before expenses		$ 13,900,000	13,911,000
Underwriting discounts and commission		1,100,000
Expenses of stock issuance		$ 1,600,000
Public price offering | $ / shares		$ 13.50
Common stock split ratio	2
Cash and due from banks			270,496,000	$ 130,263,000
Compensation cost			1,526,000	1,499,000	$ 718,000
Stock Options
Total unrecognized compensation cost			714,000	1,200,000
Compensation cost			476,000	238,000	0
Restricted Stock
Total unrecognized compensation cost			1,100,000	1,500,000
Compensation cost			1,000,000	1,300,000	$ 718,000
Cash and Due From Banks
Cash and due from banks			$ 16,400,000	$ 14,400,000
IPO
IPO Shares issued (in shares) | shares		1,224,513
Over-Allotment Option
IPO Shares issued (in shares) | shares		224,513
Proceeds received, before expenses		$ 16,500,000
Shares sold in offering | shares		939,000