ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Types of TDR (Details) - loan	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	66	4	100	27
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	2		3
Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0	0	2	2
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	64	4	93	25
Contractual payment reduction and term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	50	0	53	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 | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Contractual payment reduction and term extension | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
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	50	0	51	0
Maturity Date Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	8	1	34	1
Maturity Date Extension | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Maturity Date Extension | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
Maturity Date Extension | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		1
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	8	1	32	1
Discharged in bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	4	3	8	25
Discharged in bankruptcy | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Discharged in bankruptcy | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Discharged in bankruptcy | Commercial | Construction
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	0	0	1	2
Discharged in bankruptcy | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	4	3	7	23
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	4	0	5	1
Other | Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	2		2
Other | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modifications	0		0
Other | Commercial | Construction
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	2	0	3	1