Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)		12 Months Ended
	Aug. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Acquisitions and adjustments		$ 0	$ 961,722,000	$ 0
Goodwill impairment	$ 0
Impairment charges		0	0	0
Amortization of other intangible assets		$ 24,155,000	25,857,000	$ 11,336,000
Core Deposits and Other Intangible Assets | Minimum
Goodwill [Line Items]
Estimated useful lives		5 years
Core Deposits and Other Intangible Assets | Maximum
Goodwill [Line Items]
Estimated useful lives		15 years
Core deposit
Goodwill [Line Items]
Estimated fair value of intangible assets acquired			77,900,000
Customer trust relationships
Goodwill [Line Items]
Estimated fair value of intangible assets acquired			39,700,000
First Midwest
Goodwill [Line Items]
Acquisitions and adjustments			$ 961,700,000