ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) loan borrower	Mar. 31, 2019 USD ($) loan
Troubled Debt Restructuring
Increase (decrease) in allowance for loan loss	$ 122,000
Loan amount of credit quality analysis	250,000
Financing receivable, loan portfolio, deferrals, COVID-19	$ 99,800,000
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	77
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	2.00%
Financing receivable, loan portfolio, deferrals, COVID-19, three-month principal only, percentage of deferrals (as a percent)	95.00%
Charge-offs recorded for new troubled debt restructurings	$ 666,000
All Modifications [Member]
Troubled Debt Restructuring
Number of Loans | loan	1	1
Commercial Real Estate Building
Troubled Debt Restructuring
Financing Receivable, Modifications, Recorded Investment		$ 533,000
Commercial and Industrial Nonworking Capital
Troubled Debt Restructuring
Financing Receivable, Modifications, Recorded Investment		$ 70,000
Commercial Loan
Troubled Debt Restructuring
Financing receivable, loan portfolio, deferrals, COVID-19	$ 99,300,000
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	50
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	3.00%
Consumer Loan
Troubled Debt Restructuring
Financing receivable, loan portfolio, deferrals, COVID-19	$ 528,000
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	27
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	1.00%