Allowance for Credit Losses and Credit Quality Information - Schedule of Types of TDR (Details) - loan	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	32	34
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	1
Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	3
Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	1
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	2	10
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	30	19
Contractual payment reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	4
Contractual payment reduction | Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	1
Contractual payment reduction | Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	3
Contractual payment reduction | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Contractual payment reduction | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Contractual payment reduction | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Contractual payment reduction | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Maturity date extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	1	1
Maturity date extension | Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Maturity date extension | Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Maturity date extension | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	1
Maturity date extension | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Maturity date extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Maturity date extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	1	0
Discharged in bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	25	18
Discharged in bankruptcy | Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Discharged in bankruptcy | Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Discharged in bankruptcy | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Discharged in bankruptcy | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Discharged in bankruptcy | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	2	6
Discharged in bankruptcy | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	23	12
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	6	11
Other | Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Other | Commercial | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Other | Commercial | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Other | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	0
Other | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	0	4
Other | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan modification total	6	7