Commitments and Credit Risk (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Outstanding letters of credit	$ 52,000,000	$ 44,400,000
Standby Letters of Credit
Other Commitments [Line Items]
Deferred revenue	0	0
Federal Home Loan Bank Certificates and Obligations (FHLB)
Other Commitments [Line Items]
Outstanding letters of credit	$ 245,200,000	$ 265,700,000
Term of debt instrument (less than)	1 year	1 year
Minimum
Other Commitments [Line Items]
Term of letter of credit	9 months
Maximum
Other Commitments [Line Items]
Term of letter of credit		15 years
Credit Card Commitments
Other Commitments [Line Items]
Outstanding commitments	$ 717,100,000	$ 696,700,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments	4,710,000,000	5,640,000,000
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 30,400,000	$ 21,100,000