Commitments and Credit Risk (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Commitments to originate fixed-rate mortgage loans, term	30 days
Outstanding letters of credit	$ 580,800,000	$ 265,700,000
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	$ 54,200,000	$ 44,400,000
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	$ 738,200,000	$ 696,700,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments	4,170,000,000	5,640,000,000
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 16,600,000	$ 21,100,000