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Acquisition and Divestiture Activity (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	May 30, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) branch
Business Acquisition [Line Items]
Total loans		$ 13,601,846	$ 13,786,479
Assets		24,453,564	22,960,622
Deposits		$ 18,569,195	$ 17,037,453
Share price (in dollars per share) | $ / shares		$ 18.12
Transaction and integration costs associated with the acquisition		$ 11,000
Number of banking centers to be closed | branch			31
Wisconsin and Indiana
Business Acquisition [Line Items]
Number of banking centers to be closed | branch			10
Michigan
Business Acquisition [Line Items]
Number of banking centers to be closed | branch			5
Minnesota
Business Acquisition [Line Items]
Number of banking centers to be closed | branch			4
Kentucky
Business Acquisition [Line Items]
Number of banking centers to be closed | branch			2
First Midwest
Business Acquisition [Line Items]
Total loans		14,665,000
Assets		21,778,000
Deposits		$ 17,191,000
First Midwest
Business Acquisition [Line Items]
Shares exchange ratio	1.1336
Transaction value	$ 2,400,000
First Midwest | Former First Midwest Stockholders
Business Acquisition [Line Items]
Stock merger acquisition ratio	44.00%
First Midwest | Series A Preferred Stock
Business Acquisition [Line Items]
Dividend rate	7.00%
First Midwest | Series C Preferred Stock
Business Acquisition [Line Items]
Dividend rate	7.00%

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