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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2023
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets related to the market value |  | $ 238,300,000 |  |  |
Net deferred tax assets |  | 435,755,000 | $ 32,906,000 |  |
Bad debt reserves, created for tax purposes |  | 58,600,000 |  |  |
Valuation allowance recorded |  | 0 | 0 |  |
First Midwest |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net deferred tax assets |  | 133,900,000 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 8,800,000 |  |  |
Decrease in unrecognized tax benefits |  | 3,900,000 |  |  |
Reductions due to statute of limitations expiring | $ 1,100,000 | 1,139,000 | 0 | $ 0 |
Reductions for tax positions relating to prior years |  | 2,751,000 | 0 | $ 0 |
First Midwest | Forecast |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  | $ 7,900,000
Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 81,500,000 | 36,700,000 |  |
State |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 124,400,000 | $ 116,100,000 |  |

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- Definition Amount of bad debt reserves for tax purposes of qualified lenders excluded in calculating deferred taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 25 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=109255323&loc=d3e66323-112835 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6479915&loc=d3e66715-112838 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=126928070&loc=d3e28200-109314 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 740 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6487024&loc=d3e29054-158556 + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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