LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Summary of unpaid principal balance of loans classified as TDRs (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 9,881	$ 12,270
Allowance for loan associated with TDR	(1,423)	(833)
Net recorded investment	8,458	11,437
Additional funds to loans classified as TDRs	1,300	$ 200
Cash collateral received	$ 1,500
Number of contracts modified | loan	1	2
Cash, Securities and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 66	$ 2,803
Allowance for loan associated with TDR	(2)
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	9,815	9,467
Allowance for loan associated with TDR	(1,421)	(833)
Accrual Loans | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	6,136	5,055
Loans on nonaccrual status | Cash, Securities and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	64	2,803
Loans on nonaccrual status | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 3,679	$ 4,412