Loans and Leases - Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 312.0	$ 132.0
% of Total Class	0.50%	0.20%
Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Payment Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 3.0
% of Total Class	0.00%	0.00%
Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 72.0	$ 6.0
% of Total Class	0.10%	0.00%
Combination - Term Extension, Interest Rate Reduction, and Interest Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Combination - Term Extension, Interest Rate Reduction, and Interest Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 15.0
% of Total Class	0.00%	0.00%
Consumer | Consumer real estate | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Consumer | Consumer real estate | Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	10.70%	8.60%
Consumer | Consumer real estate | Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	6.75%	5.00%
Consumer | Consumer real estate | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Weighted average life of loans	24 years 4 months 24 days	12 years
Consumer | Consumer real estate | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Decrease from loan modification	$ (1.0)	$ (1.3)
Consumer | Consumer real estate | Payment Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 3.0
% of Total Class	0.00%	0.00%
Weighted average life of loans		11 months
Consumer | Consumer real estate | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 3.0	$ 6.0
% of Total Class	0.00%	0.00%
Weighted average life of loans	11 years	14 years 3 months 18 days
Consumer | Consumer real estate | Combination - Term Extension and Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	8.72%	5.00%
Consumer | Consumer real estate | Combination - Term Extension and Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	4.09%	4.70%
Consumer | Credit card and other | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 0.0
% of Total Class	0.00%	0.00%
Consumer | Credit card and other | Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	4.63%	11.20%
Consumer | Credit card and other | Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	3.98%	0.00%
Commercial | Commercial and industrial | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 132.0	$ 90.0
% of Total Class	0.40%	0.30%
Weighted average life of loans	1 year 3 months 18 days	1 year
Commercial | Commercial and industrial | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 8.0	$ 0.0
% of Total Class	0.00%	0.00%
Weighted average life of loans	1 year	1 year 2 months 12 days
Commercial | Commercial and industrial | Combination - Term Extension and Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	8.00%	13.00%
Commercial | Commercial and industrial | Combination - Term Extension and Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	7.50%	11.50%
Commercial | Commercial and industrial | Combination - Term Extension, Interest Rate Reduction, and Interest Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 2.0
% of Total Class	0.00%	0.00%
Weighted average life of loans		3 years 8 months 12 days
Decrease from loan modification		$ 1.0
Commercial | Commercial and industrial | Combination - 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 and industrial | Combination - 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 | Commercial real estate | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 180.0	$ 40.0
% of Total Class	1.20%	0.30%
Weighted average life of loans	1 year 3 months 18 days	9 months 18 days
Commercial | Commercial real estate | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 61.0	$ 0.0
% of Total Class	0.40%	0.00%
Weighted average life of loans	2 years
Commercial | Commercial real estate | Combination - Term Extension and Interest Rate Reduction | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	7.01%
Commercial | Commercial real estate | Combination - Term Extension and Interest Rate Reduction | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average interest rate of loans	6.66%
Commercial | Commercial real estate | Combination - Term Extension, Interest Rate Reduction, and Interest Deferrals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance	$ 0.0	$ 15.0
% of Total Class	0.00%	0.10%
Weighted average life of loans		1 year
Decrease from loan modification		$ 1.0
Commercial | Commercial real estate | Combination - 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%
Commercial | Commercial real estate | Combination - 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%