Commitments and Credit Risk (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Commitments to originate fixed-rate mortgage loans, term	30 days
Outstanding letters of credit	$ 1,120,000,000	$ 580,800,000
Term of letter of credit	1 year	1 year
Standby Letters of Credit
Other Commitments [Line Items]
Outstanding letters of credit	$ 41,600,000	$ 54,200,000
Deferred revenue	$ 0	$ 0
Minimum | Standby Letters of Credit
Other Commitments [Line Items]
Term of letter of credit	9 months	9 months
Maximum | Standby Letters of Credit
Other Commitments [Line Items]
Term of letter of credit	15 years	15 years
Credit Card Commitments
Other Commitments [Line Items]
Outstanding commitments	$ 756,900,000	$ 738,200,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments	4,030,000,000.00	4,170,000,000
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 17,800,000	$ 16,600,000