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v3.22.1

Acquisition Activity - Additional Information (Details) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 15, 2022 USD ($) shares | May 30, 2021 | Mar. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |
Purchase price of loans at acquisition |  |  | $ 1,400,831
Par value of acquired loans at acquisition |  |  | 1,488,365
Allowance for credit losses at acquisition |  |  | 78,531
Accumulated benefit obligation |  |  | 60,200
Plan assets |  |  | 77,200
Series A Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued for acquisition (in shares) | shares | 108,000 |  |
Series C Preferred Stock |  |  |
Business Acquisition [Line Items] |  |  |
Shares issued for acquisition (in shares) | shares | 122,500 |  |
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 |
Other intangible assets | $ 117,584 |  |
Transaction costs, expensed |  |  | 41,300
Transaction costs |  |  | 41,300
Increase in allowance for loan loss |  |  | 96,300
Transaction value | 2,690,182 |  |
First Midwest | Unfunded Loan Commitment |  |  |
Business Acquisition [Line Items] |  |  |
Increase in allowance for loan loss |  |  | $ 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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