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Acquisition Activity - Total Consideration (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 15, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Assets |  |  |  |  |
Goodwill |  | $ 1,997,157 | $ 1,036,994 | $ 1,036,994 | $ 1,036,994
Fair value of consideration |  |  |  |  |
Issuance of common stock |  | 2,446,312 |  |  |
Preferred Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock |  | 243,870 | 0 |  |
Common Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock | $ 129,365 | $ 129,365 | $ 0 |  |
Share price (in dollars per share) | $ 18.92 |  |  |  |
First Midwest |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents | $ 1,912,629 |  |  |  |
Investment securities | 3,526,278 |  |  |  |
FHLB/Federal Reserve Bank stock | 106,097 |  |  |  |
Loans held for sale | 13,809 |  |  |  |
Loans, net of allowance for credit losses | 14,308,309 |  |  |  |
Premises and equipment | 108,306 |  |  |  |
Operating lease right-of-use assets | 134,388 |  |  |  |
Accrued interest receivable | 53,502 |  |  |  |
Goodwill | 960,163 |  |  |  |
Other intangible assets | 117,584 |  |  |  |
Company-owned life insurance | 301,025 |  |  |  |
Other assets | 322,267 |  |  |  |
Total assets | 21,864,357 |  |  |  |
Liabilities |  |  |  |  |
Deposits | 17,249,404 |  |  |  |
Securities sold under agreements to repurchase | 135,194 |  |  |  |
Federal Home Loan Bank advances | 1,158,623 |  |  |  |
Other borrowings | 274,569 |  |  |  |
Accrued expenses and other liabilities | 356,385 |  |  |  |
Total liabilities | 19,174,175 |  |  |  |
Fair value of consideration |  |  |  |  |
Total consideration | $ 2,690,182 |  |  |  |
First Midwest | Preferred Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock shares for acquisitions of business | 243,870 |  |  |  |
First Midwest | Common Stock |  |  |  |  |
Fair value of consideration |  |  |  |  |
Issuance of common stock shares for acquisitions of business | 2,446,312 |  |  |  |

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