Commitments and Credit Risk - Textual (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Outstanding letters of credit	$ 39,400,000	$ 37,700,000
Federal Home Loan Bank Certificates and Obligations (FHLB)
Other Commitments [Line Items]
Outstanding letters of credit	59,300,000	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	$ 689,400,000	685,300,000
Other loan commitments
Other Commitments [Line Items]
Outstanding commitments	3,780,000,000	3,410,000,000
Fixed Rate Mortgage Loans
Other Commitments [Line Items]
Outstanding commitments	$ 96,700,000	$ 108,500,000