Commitments and Credit Risk (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Commitments to originate fixed-rate mortgage loans, term	30 days
Outstanding letters of credit	$ 1,300,000,000	$ 1,120,000,000
Investment, Type [Extensible Enumeration]	Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]	Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Term of letter of credit	1 year	1 year
Standby Letters of Credit
Other Commitments [Line Items]
Outstanding letters of credit	$ 49,400,000	$ 41,600,000
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	$ 762,400,000	$ 756,900,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments	4,190,000,000	4,030,000,000.00
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 33,300,000	$ 17,800,000