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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Schedule of Brief Description of Accounting Standards Adopted or Issued | The following table provides a brief description of accounting standards adopted in 2025 or recently issued and the estimated effect on the Company’s financial statements.
Standard | Description | Required date of adoption | Effect on Company's financial statements or other significant matters
Standards Adopted (or partially adopted) in 2025
ASU 2023—09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures | In December 2023, the FASB issued ASU 2023-09 to enhance the transparency and decision usefulness of income tax disclosures. The ASU addresses investor requests for more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. Retrospective application in all prior periods is permitted. | Annual period beginning on January 1, 2025 | The Company has included the applicable and relevant required disclosures on a retrospective basis in Note 16 - Income Taxes.
Standard | Description | Required date of adoption | Effect on Company's financial statements or other significant matters
Standards Issued But Not Yet Adopted in 2025
ASU 2024—03, Income Statement (Topic 220): Disaggregation of Income Statement Expenses | In November 2024, the FASB issued ASU 2024-03 to improve the disclosures over expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions. The ASU addresses investors requests for more disaggregated expense information to better understand an entity's performance, better assess the entity's prospects for future cash flows, and compare an entity's performance over time and with that of other entities. This ASU requires disclosure in the notes to the financial statements of specified information about certain costs and expenses. Retrospective application in all prior periods is permitted. | January 1, 2027 | The Company expects Newco to adopt this standard as of January 1, 2027 and is currently evaluating the impact of the incremental expense information that will be required to be disclosed.
ASU 2025-06 —Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software | In September 2025, the FASB issued ASU 2025-06 to clarify and modernize the accounting for costs related to internal-use software. The ASU removes all references to project stages throughout ASC 350-40 and clarifies the threshold entities should apply to begin capitalizing costs. The ASU addresses investor feedback that the current guidance for software costs is outdated and not relevant given the evolution of software development. The ASU requires disclosures under ASC 360-10 be applied to all capitalized software costs accounted for under ASC 350-40, regardless of how those costs are presented in the financial statements. Early adoption is permitted, including adoption in an interim period but must be applied as of the beginning of the annual period that includes that interim period. The ASU may be adopted prospectively, retrospectively; or on a modified transition approach. | January 1, 2028 | The Company expects Newco to adopt this standard as of January 1, 2026 and does not expect there to be a significant impact on the consolidated financial statements or disclosures.
ASU 2025-08— Financial Instruments — Credit Losses (Topic 326) — Purchased Loans | In November 2025, the FASB issued ASU 2025-08 to expand the population of acquired financial assets subject to the gross-up approach in Topic 326. In accordance with the amendments in this ASU, loans (excluding credit cards) acquired without credit deterioration and deemed "seasoned" are purchased seasoned loans and accounted for using the gross-up approach at acquisition. All non-purchased credit deteriorated ("non-PCD") loans (excluding credit cards) that are acquired in a business combination are deemed seasoned. Other non-PCD loans (excluding credit cards) are seasoned if they were purchased at least 90 days after origination, and the acquirer was not involved in the origination of the loans. The amendments in this ASU are effective for all entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods.The amendments in this ASU should be applied prospectively to loans that are acquired on or after the initial application date. Early adoption is permitted in an interim or annual reporting period in which financial statements have not yet been issued or made available for issuance. | January 1, 2027 | The Company expects Newco to adopt this standard as of January 1, 2026 and apply the guidance to the Synovus loans that will be acquired by Pinnacle in conjunction with the merger with Pinnacle.

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