Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Feb. 28, 2022	Feb. 15, 2022	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Issuance of common stock				$ 2,446,312
Series A Preferred Stock
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)		108,000
Series C Preferred Stock
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)		122,500
Preferred Stock
Property, Plant and Equipment [Line Items]
Issuance of common stock	$ 243,700
First Midwest
Property, Plant and Equipment [Line Items]
Shares issued for acquisition (in shares)	129,400,000
Issuance of common stock	$ 2,400,000
Minimum
Property, Plant and Equipment [Line Items]
Maturity of short-term securities sold under agreements to repurchase			1 day
Minimum | Core Deposits and Other Intangible Assets
Property, Plant and Equipment [Line Items]
Estimated useful lives of core deposits and customer relationships			5 years
Minimum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			10 years
Minimum | Furniture and Equipment
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			3 years
Maximum
Property, Plant and Equipment [Line Items]
Maturity of short-term securities sold under agreements to repurchase			4 days
Maximum | Core Deposits and Other Intangible Assets
Property, Plant and Equipment [Line Items]
Estimated useful lives of core deposits and customer relationships			15 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			39 years
Maximum | Furniture and Equipment
Property, Plant and Equipment [Line Items]
Useful lives for premises and equipment, years			7 years