Commitments and Credit Risk (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Outstanding letters of credit	$ 37,700,000	$ 49,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB)
Other Commitments [Line Items]
Outstanding letters of credit	$ 59,100,000	$ 1,550,000,000
Term of debt instrument	1 year	1 year
Standby Letters of Credit
Other Commitments [Line Items]
Deferred revenue	$ 0	$ 0
Minimum
Other Commitments [Line Items]
Term of letter of credit	9 months	9 months
Maximum
Other Commitments [Line Items]
Term of letter of credit	15 years	15 years
Credit Card Commitments
Other Commitments [Line Items]
Outstanding commitments to extend credit	$ 685,300,000	$ 671,500,000
Other Loan Commitments
Other Commitments [Line Items]
Outstanding commitments to extend credit	3,410,000,000	2,360,000,000
Fixed Rate Residential Mortgage
Other Commitments [Line Items]
Outstanding commitments to extend credit	$ 108,500,000	$ 214,000,000