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Merger, Acquisition, and Divestiture Activity - Total Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 15, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Assets |  |  |  |  |
Goodwill |  | $ 1,998,716,000 | $ 1,998,716,000 | $ 1,036,994,000 | $ 1,036,994,000
Fair value of consideration |  |  |  |  |
Issuance of common stock |  |  | 2,446,312,000 |  |
Common Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock |  | $ 129,365,000 | $ 129,365,000 |  |
Share price (in dollars per share) |  | $ 18.92 |  |  |
First Midwest |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents | $ 1,912,629,000 |  |  |  |
Investment securities | 3,526,278,000 |  |  |  |
FHLB/Federal Reserve Bank stock | 106,097,000 |  |  |  |
Loans held-for-sale | 13,809,000 |  |  |  |
Loans, net of allowance for credit losses | 14,298,873,000 |  |  |  |
Premises and equipment | 111,867,000 |  |  |  |
Operating lease right-of-use assets | 129,698,000 |  |  |  |
Accrued interest receivable | 53,502,000 |  |  |  |
Goodwill | 961,722,000 |  |  |  |
Other intangible assets | 117,584,000 |  |  |  |
Company-owned life insurance | 301,025,000 |  |  |  |
Other assets | 317,258,000 |  |  |  |
Total assets | 21,850,342,000 |  |  |  |
Liabilities |  |  |  |  |
Deposits | 17,249,404,000 |  |  |  |
Securities sold under agreements to repurchase | 135,194,000 |  |  |  |
Federal Home Loan Bank advances | 1,158,623,000 |  |  |  |
Other borrowings | 274,569,000 |  |  |  |
Accrued expenses and other liabilities | 342,369,000 |  |  |  |
Total liabilities | 19,160,159,000 |  |  |  |
Fair value of consideration |  |  |  |  |
Total consideration | $ 2,690,182,000 |  |  |  |
First Midwest | Preferred Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock shares for acquisitions of business (in shares) | 243,870 |  |  |  |
First Midwest | Common Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock shares for acquisitions of business (in shares) | 2,446,312 |  |  |  |

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