Loans and Leases - Summary of Collateral-Dependent Loans Held for Investment by Collateral Type (Details) $ in Millions	Dec. 31, 2021 USD ($)
Real Estate
Disclosure Of Summary Of Collateral Dependent Loans Held For Investment By Collateral Type [Line Items]
Loans and leases receivable, collateral for secured borrowings	$ 39
Assets received as collateral	39
Real Estate | Multi-Family
Disclosure Of Summary Of Collateral Dependent Loans Held For Investment By Collateral Type [Line Items]
Loans and leases receivable, collateral for secured borrowings	9
Real Estate | Commercial Real Estate
Disclosure Of Summary Of Collateral Dependent Loans Held For Investment By Collateral Type [Line Items]
Loans and leases receivable, collateral for secured borrowings	30
Other
Disclosure Of Summary Of Collateral Dependent Loans Held For Investment By Collateral Type [Line Items]
Loans and leases receivable, collateral for secured borrowings	6
Other | Commercial and Industrial
Disclosure Of Summary Of Collateral Dependent Loans Held For Investment By Collateral Type [Line Items]
Loans and leases receivable, collateral for secured borrowings	$ 6