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Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) portfolio segment | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) portfolio segment | Jun. 30, 2021 USD ($) loan | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Number of loan portfolios | portfolio | 4 |  | 4 |  |  |  |  |
Number of loan segments | segment | 7 |  | 7 |  |  |  |  |
Accrued interest receivable on loans | $ 104,600,000 |  | $ 104,600,000 |  |  | $ 47,600,000 |  |
Provision for loan losses | 0 | $ 0 | 78,531,000 | $ 0 |  |  |  |
Allowance for credit losses | 288,003,000 | 109,444,000 | $ 288,003,000 | $ 109,444,000 | $ 280,507,000 | 107,341,000 | $ 114,037,000 | $ 131,388,000
Loan placed on nonaccrual when past due, number of days |  |  | 90 days |  |  |  |  |
Loan participations | 2,400,000,000 |  | $ 2,400,000,000 |  |  |  |  |
Loan participations sold | 1,200,000,000 |  | 1,200,000,000 |  |  |  |  |
Loan participations retained | 1,200,000,000 |  | $ 1,200,000,000 |  |  |  |  |
TDR term |  |  | 6 months |  |  |  |  |
Minimum number of days for loan charge off to be recorded |  |  | 120 days |  |  |  |  |
Maximum number of days for loan charge off to be recorded |  |  | 180 days |  |  |  |  |
Financing receivable TDRs included with non-accrual loans | 24,300,000 |  | $ 24,300,000 |  |  | 11,700,000 |  |
Financing receivable TDR specific reserves | 5,800,000 |  | 5,800,000 |  |  | 700,000 |  |
Unfunded commitments on TDRs | 0 |  | 0 |  |  | 0 |  |
Financing receivable, TDR, number of loans qualified for removal | loan |  |  |  | 1 |  |  |  |
Charge-offs | 0 | (7,000) | $ (9,000) | $ (22,000) |  |  |  |
Number of days for a loan to be considered to be in payment default |  |  | 90 days |  |  |  |  |
Troubled Debt Restructurings During Period |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Increase in allowance for loan losses |  |  | $ 5,500,000 | 0 |  |  |  |
Charge-offs |  |  | 0 | 0 |  |  |  |
First Midwest |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for loan losses |  |  | 78,500,000 |  |  |  |  |
Allowance for credit losses | 96,300,000 |  | 96,300,000 |  |  |  |  |
Commercial |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for loan losses | 0 | 0 | 35,040,000 | 0 |  |  |  |
Allowance for credit losses | 102,819,000 | 25,731,000 | 102,819,000 | 25,731,000 | 99,471,000 | 27,232,000 | 25,130,000 | 30,567,000
Charge-offs | $ 0 | 0 | $ 0 | 0 |  |  |  |
Commercial real estate |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |
Percentage of risk-based capital | 224.00% |  | 224.00% |  |  |  |  |
Regulatory guideline limit | 300.00% |  | 300.00% |  |  |  |  |
Provision for loan losses | $ 0 | 0 | $ 42,601,000 | 0 |  |  |  |
Allowance for credit losses | 141,802,000 | 65,469,000 | 141,802,000 | 65,469,000 | $ 140,490,000 | $ 64,004,000 | $ 70,561,000 | $ 75,810,000
Charge-offs | $ 0 | $ (5,000) | $ (4,000) | $ (15,000) |  |  |  |

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