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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | 9 Months Ended
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Sep. 30, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | ​ 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES ​ The Company Headquartered in Richmond, Virginia, Atlantic Union Bankshares Corporation (NYSE: AUB) is the holding company for Atlantic Union Bank (the “Bank”), which provides banking and related financial products and services to consumers and businesses. Except as otherwise indicated or the context suggests otherwise, references to the “Company” refers to Atlantic Union Bankshares Corporation and its subsidiaries. Basis of Financial Information The accounting policies and practices of Atlantic Union Bankshares Corporation and subsidiaries conform to accounting principles generally accepted in the United States (“GAAP”) and follow general practices within the banking industry. The consolidated financial statements include the accounts of the Company, which is a financial holding company and a bank holding company that owns all of the outstanding common stock of its banking subsidiary, Atlantic Union Bank, which owns Union Insurance Group, LLC, Atlantic Union Financial Consultants, LLC, and Atlantic Union Equipment Finance, Inc. The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. The preparation of the unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses (“ACL”), the fair value of financial instruments, and the fair values associated with assets acquired and liabilities assumed in a business combination. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other period. On April 1, 2025, the Company completed its acquisition of Sandy Spring Bancorp, Inc. (“Sandy Spring”). Sandy Spring’s results of operations are included in the Company’s consolidated results since the date of acquisition. On April 1, 2024, the Company completed its acquisition of American National Bankshares Inc. (“American National”). American National’s results of operations are included in the Company’s consolidated results since the date of acquisition. The unaudited consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (the “2024 Form 10-K”). Certain prior period amounts have been reclassified to conform to current period presentation. None of these reclassifications had a material effect on the Company’s financial statements. See Note 1 “Summary of Significant Accounting Policies” in the “Notes to the Consolidated Financial Statements” contained in Item 8 “Financial Statements and Supplementary Data” in the Company’s 2024 Form 10-K for additional information on the Company’s accounting policies. There have not been any significant changes to the Company’s accounting policies from those disclosed in the Company’s 2024 Form 10-K that could have a material effect on the Company’s financial statements, except as discussed below. The accounting policy on acquired loans set forth below should be read in conjunction with the Company’s accounting policies for acquisition accounting and charge-offs contained in Note 1 of the Company’s 2024 Form 10-K under the headings “Acquisition Accounting” and “Nonaccruals, Past Dues and Charge-offs,” respectively, which include additional guidance on the accounting for acquired loans that have experienced a more-than insignificant amount of credit deterioration since origination (“PCD” loans). ​ Acquired Loans Acquired loans are recorded at their fair value at the acquisition date without carryover of the acquiree’s previously established allowance for loan and lease losses (“ALLL”). The fair value for acquired loans is determined using a discounted cash flow analysis that considers factors including loan type, interest rate type, prepayment speeds, duration and current discount rates. During evaluation upon acquisition, acquired loans are also classified as either PCD or non-PCD. Acquired loans are subject to the Company’s ALLL policy upon acquisition. ​ For loans that have not experienced a more-than an insignificant amount of credit deterioration since origination, the difference between the fair value and unpaid principal balance of the loans at the acquisition date (premium or discount) is amortized or accreted into interest income over the life of the loans in accordance with Accounting Standards Codification (“ASC”) 310-20, Receivables – Nonrefundable Fees and Other Costs. If the acquired performing loan has revolving privileges, the discount/premium is accounted for using the straight-line method; otherwise, the Company uses the effective interest rate method. ​ The Company records PCD loans at the amount paid and establishes an initial ALLL using the same methodology as other loans held for investment (“LHFI”). The sum of the PCD loan’s purchase price and initial ALLL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan under ASC 310-20, Receivables – Nonrefundable Fees and Other Costs. If the loan has revolving privileges, the discount/premium is amortized/accreted using the straight-line method; otherwise, the effective interest method is used. Subsequent changes to the ALLL are recorded through provision expense. ​ When determining the initial ALLL on PCD loans, the Company considers charge offs necessary at acquisition to comply with the Company’s charge off policy. For PCD loans that are subject to write-off under the Company’s charge-off policy at acquisition, the initial ALLL on PCD loans is included as part of the loan balance at the time of acquisition and is immediately written off with no impact on net income. See also Note 4 “Loans and Allowance for Loan and Lease Losses” within Part I, Item 1 of this Quarterly Report for additional detail regarding the ALLL on PCD loans. ​ See also Note 2 “Acquisitions” within Part I, Item 1 of this Quarterly Report for additional discussion of the Company’s acquisitions. ​

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