LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR LOAN LOSSES - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) application loan contract category component class	Dec. 31, 2020 USD ($) loan contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum amount to evaluate individual loans for possible impairment	$ 100,000
Maximum amount to evaluate individual loans for possible impairment on a case by case basis	$ 100,000
Payment delays period up to which loans are not classified as impaired, maximum (in days)	90 days
Impaired financing receivable commitment to lend	$ 1,000
Period to classify TDR non performing loans to performing (in months)	6 months
Number of TDRs granted | loan	6	5
Number of loan modifications considered TDRs (in contracts) | contract	1	0
Number of categories, internal risk rating to monitor credit quality (in categories) | category	10
Number of categories considered not criticized and rated as Pass | category	6
Minimum period after which loans are considered as substandard (in days)	90 days
Average outstanding commercial portfolio percentage	55.00%
Number of components that represents the allowance for loan losses | component	2
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 1,391,846,000	$ 1,343,304,000
Amount of foreclosed residential real estate held	339,000	614,000
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	$ 193,000	$ 51,000
Number of loan modifications (in contracts) | contract	6	5
Loans	$ 1,392,147,000	$ 1,344,327,000
Number of classes that groups of loans are collectively evaluated for impairment | class	2
Period considered for quarter moving average which used in calculating historical charge off (in months)	36 months
Adjustment of period considered for quarter moving average which used in calculating historical charge off (in months)	12 months
Other consumer installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process	$ 9,277,000	$ 19,940,000
Number of loan modifications (in contracts) | contract	0	0
COVID-19 Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan modifications (in contracts) | contract	1,450
Loans	$ 193,060,000
Number of remaining loan modifications (in contracts) | loan	5
Loan modifications	$ 379,000
Payment Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 10,600,000
Number of loan applications (in applications) | application	444
Loan application value	$ 30,556,000
Payment Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs granted | loan	2	4
Amount of TDRs granted	$ 842,000	$ 1,231,000
Rate Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs granted | loan	1	1
Amount of TDRs granted	$ 124,000	$ 1,060,000
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of categories in which real estate loans are segmented | category	3