ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Types of TDR (Details) - loan	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	28	4	34	23
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	1	0	2	2
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	27	4	31	21
Contractual payment reduction and term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	3	0
Contractual payment reduction and term extension | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
Contractual payment reduction and term extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	1	0
Contractual payment reduction and term extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	1	0
Maturity Date Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	26	0	26	0
Maturity Date Extension | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Maturity Date Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	0	0
Maturity Date Extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	26	0	26	0
Discharged in bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	2	3	4	22
Discharged in bankruptcy | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Discharged in bankruptcy | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	1	0	1	2
Discharged in bankruptcy | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	1	3	3	20
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	1	1	1
Other | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Other | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	0	0
Other | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	1	1	1