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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |
Acquisitions and adjustments |  | $ 0 | $ 961,722,000 | $ 0
Goodwill impairment | $ 0 |  |  |
Impairment charges |  | 0 | 0 | 0
Amortization of other intangible assets |  | $ 24,155,000 | 25,857,000 | $ 11,336,000
Core Deposits and Other Intangible Assets | Minimum |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives |  | 5 years |  |
Core Deposits and Other Intangible Assets | Maximum |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated useful lives |  | 15 years |  |
Core deposit |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated fair value of intangible assets acquired |  |  | 77,900,000 |
Customer trust relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Estimated fair value of intangible assets acquired |  |  | 39,700,000 |
First Midwest |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquisitions and adjustments |  |  | $ 961,700,000 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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