Loans and Leases - Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 481.0	$ 384.0	$ 162.0
% of Total Class	0.75%	0.60%	0.26%
Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 45.0	$ 0.0	$ 2.0
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	379.0	312.0	132.0
Principal Forgiven/Payment Deferred
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1.0	0.0	5.0
Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 56.0	$ 72.0	$ 23.0
C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction	0.00%	0.00%	0.00%
Weighted-average Term Extension (in years)	1 year 18 days	1 year 3 months 14 days	1 year
Amount of Principal Forgiven/Payment Deferred	$ 0.0	$ 0.0	$ 0.0
C&I | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction	1.23%	0.50%	3.88%
Weighted-average Term Extension (in years)	1 year 2 months 12 days	9 months 3 days	3 years 10 months 6 days
CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction	0.68%	0.00%	0.00%
Weighted-average Term Extension (in years)	1 year 5 months 4 days	1 year 3 months	9 months 18 days
Amount of Principal Forgiven/Payment Deferred	$ 0.0	$ 0.0	$ 0.0
CRE | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction	0.90%	0.35%	0.72%
Weighted-average Term Extension (in years)	2 years 3 months 29 days	2 years 10 days	1 year 1 month 13 days
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction			3.60%
Weighted-average Term Extension (in years)			12 years
Amount of Principal Forgiven/Payment Deferred			$ 1.3
Consumer real estate | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted-average Interest Rate Reduction			1.09%
Weighted-average Term Extension (in years)			12 years 4 months 17 days
C&I
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 195.0	$ 140.0	$ 92.0
% of Total Class	0.54%	0.42%	0.28%
C&I | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 0.0	$ 0.0	$ 0.0
C&I | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	188.0	132.0	90.0
C&I | Principal Forgiven/Payment Deferred
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	0.0	0.0	0.0
C&I | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	7.0	8.0	2.0
CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 283.0	$ 241.0	$ 55.0
% of Total Class	2.09%	1.67%	0.39%
CRE | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 45.0	$ 0.0	$ 0.0
CRE | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	191.0	180.0	40.0
CRE | Principal Forgiven/Payment Deferred
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	0.0	0.0	0.0
CRE | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	47.0	61.0	15.0
Consumer real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 3.0	$ 3.0	$ 15.0
% of Total Class	0.02%	0.02%	0.11%
Consumer real estate | Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 0.0	$ 0.0	$ 2.0
Consumer real estate | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	0.0	0.0	2.0
Consumer real estate | Principal Forgiven/Payment Deferred
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1.0	0.0	5.0
Consumer real estate | Combination - Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 2.0	$ 3.0	$ 6.0