Loans and Leases - Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Extended maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 132.0
% of Total Class	0.20%
Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Payment Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 3.0
% of Total Class	0.00%
Term Extension And Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 6.0
% of Total Class	0.00%
Term Extension, Interest Rate Reduction, and Interest Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Term Extension, Interest Rate Reduction, and Interest Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 15.0
% of Total Class	0.00%
Consumer | Consumer real estate | Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Consumer | Consumer real estate | Contractual Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	5.00%
Consumer | Consumer real estate | Contractual Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	8.60%
Consumer | Consumer real estate | Extended maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Weighted average life of loans	12 years
Consumer | Consumer real estate | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Decrease from loan modification	$ 1.3
Consumer | Consumer real estate | Payment Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 3.0
% of Total Class	0.00%
Weighted average life of loans	11 months
Consumer | Consumer real estate | Term Extension And Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 6.0
% of Total Class	0.00%
Weighted average life of loans	14 years 3 months 18 days
Consumer | Consumer real estate | Term Extension And Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	4.70%
Consumer | Consumer real estate | Term Extension And Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	5.00%
Consumer | Credit card and other | Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0
% of Total Class	0.00%
Consumer | Credit card and other | Contractual Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	0.00%
Consumer | Credit card and other | Contractual Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	11.20%
Commercial | C&I | Extended maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 90.0
% of Total Class	0.30%
Weighted average life of loans	1 year
Commercial | C&I | Term Extension And Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0
% of Total Class	0.00%
Weighted average life of loans	1 year 2 months 12 days
Commercial | C&I | Term Extension And Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	11.50%
Commercial | C&I | Term Extension And Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	13.00%
Commercial | C&I | Term Extension, Interest Rate Reduction, and Interest Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 2.0
% of Total Class	0.00%
Weighted average life of loans	3 years 8 months 12 days
Interest forgiveness	$ 1.0
Commercial | C&I | Term Extension, Interest Rate Reduction, and Interest Forgiveness | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	7.50%
Commercial | C&I | Term Extension, Interest Rate Reduction, and Interest Forgiveness | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	11.25%
Commercial | Commercial real estate | Extended maturities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 40.0
% of Total Class	0.30%
Weighted average life of loans	9 months 18 days
Commercial | Commercial real estate | Term Extension, Interest Rate Reduction, and Interest Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 15.0
% of Total Class	0.10%
Weighted average life of loans	1 year
Deferred interest	$ 1.0
Commercial | Commercial real estate | Term Extension, Interest Rate Reduction, and Interest Deferrals | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	8.00%
Commercial | Commercial real estate | Term Extension, Interest Rate Reduction, and Interest Deferrals | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	8.65%