Commitments and Credit Risk - Textual (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Outstanding letters of credit	$ 50,600,000	$ 37,700,000
Federal Home Loan Bank Certificates and Obligations (FHLB)
Other Commitments [Line Items]
Outstanding letters of credit	113,800,000	59,100,000
Standby Letters of Credit
Other Commitments [Line Items]
Deferred revenue	$ 0	0
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	$ 696,700,000	685,300,000
Other loan commitments
Other Commitments [Line Items]
Outstanding commitments	5,620,000,000	3,410,000,000
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 37,200,000	$ 108,500,000