Acquisitions - Additional Information (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 17, 2021 USD ($) county branch	Mar. 26, 2019 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Acquisition of goodwill			$ 154,572	$ 151,238	$ 151,238
Common stock, shares outstanding | shares			43,547,942	43,880,562
TCF National Bank
Business Acquisition [Line Items]
Number of branches acquired | branch	14
Number of counties branches acquired | county	11
Net cash received	$ (618,200)
Total loans	212,000
Premises and equipment, net	6,901
Cash and due from banks	$ 4,012
Percentage of premium on deposits	1.75%
Customer deposits	$ 846,400
Net intangible assets acquired	1,630
Acquisition of goodwill	$ 3,334
TCF National Bank | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Useful life	10 years
Salin
Business Acquisition [Line Items]
Total loans		$ 568,918
Premises and equipment, net		20,425
Cash and due from banks		152,745
Net intangible assets acquired		19,818
Acquisition of goodwill		$ 31,358
Exchange ratio per share		23907.50%
Cash paid for each share (in USD per share) | $ / shares		$ 87,417.17
Common stock, shares outstanding | shares		275
Common stock issued (in shares) | shares		6,563,697
Market closing price per share | $ / shares		$ 15.65
Estimated transaction value		$ 126,700
Costs related to the acquisition		5,600
Total purchase price		$ 126,722
Core deposit intangible amortization period			10 years