COVID-19 AND CURRENT ECONOMIC CONDITIONS (Details) $ in Millions		12 Months Ended
	Jan. 20, 2021 USD ($) borrower	Dec. 31, 2020 USD ($) borrower
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable, loan portfolio, deferrals, COVID-19	$ 102.2	$ 100.7
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	50	49
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	2.30%	2.20%
Loans under second deferral action	$ 20.8
Loans under fourth deferral action	$ 26.6
Period of deferral loans	90 days
Number of borrowers | borrower	14
Commercial real estate
Unusual or Infrequent Item, or Both [Line Items]
Number of borrowers | borrower	2
Commercial loan
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable, loan portfolio, deferrals, COVID-19	$ 99.7	$ 98.2
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	24	22
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	2.40%	2.30%
Loans under first deferral action		$ 11.9
Loans under second deferral action		22.8
Loans under third deferral action	$ 40.2	41.9
Loans under fourth deferral action		24.1
Number of borrowers | borrower	11
Population percent	89.00%
Consumer loan open-ended revolving lines
Unusual or Infrequent Item, or Both [Line Items]
Financing receivable, loan portfolio, deferrals, COVID-19	$ 2.5	$ 2.5
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower	26	27
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent)	0.70%	0.70%