Loans and Leases - Collateral-Dependent Loans Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss, writeoff, collateral	$ 1,000,000	$ 0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, collateral for secured borrowings	120,000,000	167,000,000
C&I (a)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, allowance for credit loss, writeoff, collateral	26,000,000	36,000,000
C&I (a) | Commercial | C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, collateral for secured borrowings	115,000,000
CRE (b) | Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, collateral for secured borrowings	5,000,000
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, collateral for secured borrowings	7,000,000	9,000,000
Real estate installment loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, collateral for secured borrowings	$ 20,000,000	$ 26,000,000