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v3.22.4

Merger, Acquisition, and Divestiture Activity - Additional Information (Details) $ in Thousands |  |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 18, 2022 USD ($) | Feb. 15, 2022 USD ($) agreement shares | May 30, 2021 shares | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) branch | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of deposit agreements (in agreements) | agreement |  | 2 |  |  |  |  |  |  |
Purchase price of loans at acquisition |  | $ 1,400,000 |  |  |  | $ 1,390,273 |  |  |
Par value of acquired loans at acquisition |  | 1,500,000 |  |  |  | 1,488,365 |  |  |
Allowance for credit losses at acquisition |  | $ 89,100 |  |  |  | 89,089 |  |  |
Plan assets |  |  |  | $ 16,600 | $ 16,600 | 16,600 |  |  |
Allowance for credit losses |  |  |  | 303,671 | 303,671 | 303,671 | $ 107,341 | $ 131,388 | $ 54,619
Deposits, health savings accounts | $ 382,000 |  |  |  |  |  |  |  |
Gain on sale of health savings accounts | $ 90,700 |  |  |  |  | 90,673 | 0 | 0 |
Property optimization |  |  |  | 26,800 |  | 26,818 | $ 0 | $ 27,050 |
Number of banking centers to be closed | branch |  |  |  |  |  |  |  | 31 |
Series A Preferred Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued for acquisition (in shares) | shares |  | 108,000 |  |  |  |  |  |  |
Depositary shares, interest in non-cumulative perpetual preferred stock |  | 2.50% |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued for acquisition (in shares) | shares |  | 122,500 |  |  |  |  |  |  |
Depositary shares, interest in non-cumulative perpetual preferred stock |  | 2.50% |  |  |  |  |  |  |
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued for acquisition (in shares) | shares |  | 4,320,000 |  |  |  |  |  |  |
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued for acquisition (in shares) | shares |  | 4,900,000 |  |  |  |  |  |  |
First Midwest |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares exchange ratio |  |  | 1.1336 |  |  |  |  |  |
Number of shares to be received upon conversion (in shares) | shares |  |  | 1 |  |  |  |  |  |
Increase in goodwill |  |  |  |  | 1,600 |  |  |  |
Other intangible assets |  | $ 117,584 |  |  |  |  |  |  |
Transaction costs, expensed |  |  |  |  |  | 120,900 |  |  |
Transaction costs |  |  |  |  |  | 120,900 |  |  |
Allowance for credit losses |  |  |  | 96,300 | 96,300 | 96,300 |  |  |
First Midwest | Unfunded Loan Commitment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | $ 11,000 | $ 11,000 | $ 11,000 |  |  |
First Midwest | Core deposit |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Other intangible assets |  | $ 77,900 |  |  |  |  |  |  |
Estimated useful lives |  | 10 years |  |  |  |  |  |  |
First Midwest | Customer trust relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Other intangible assets |  | $ 39,700 |  |  |  |  |  |  |
Estimated useful lives |  | 13 years |  |  |  |  |  |  |
First Midwest | Series A Preferred Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate |  |  | 7.00% |  |  |  |  |  |
First Midwest | Series C Preferred Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate |  |  | 7.00% |  |  |  |  |  |

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