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Operating Segments Operating Segments - Additional Information (Details) $ in Billions | 12 Months Ended
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Dec. 31, 2022 USD ($) Segment | Dec. 31, 2021 USD ($) Segment | Dec. 31, 2020 USD ($) Segment
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | Segment | 2 | 2 | 2
Frost Wealth Advisors [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Fair value of off-balance sheet managed and custody assets | $ | $ 43.6 | $ 43.3 | $ 38.6

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- Definition The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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