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Basis of Financial Statement Presentation
9 Months Ended
Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Basis of Financial Statement Presentation Basis of Financial Statement Presentation
    The accompanying consolidated financial statements include the accounts of Columbia Financial, Inc. ("Columbia Financial"), its wholly-owned subsidiary, Columbia Bank ("Columbia") (including the accounts of Freehold Bank, which merged with and into Columbia effective as of October 5, 2024), and Columbia's wholly-owned subsidiaries, Columbia Investment Services, Inc., 1901 Residential Management Co. LLC, First Jersey Title Services, Inc., 1901 Commercial Management Co. LLC, Stewardship Realty LLC, Columbia Insurance Services Inc. (formerly known as "RSI Insurance Agency, Inc."), and 19-01 Community Development Corporation, (collectively, the “Company”). In May 2024, Columbia dissolved its wholly-owned subsidiary 2500 Broadway Corp. In consolidation, all intercompany accounts and transactions are eliminated.

    Columbia Financial, Inc. is a majority-owned subsidiary of Columbia Bank, MHC (the "MHC"). The accounts of the MHC are not consolidated in the accompanying consolidated financial statements of the Company.
    
    In preparing the interim unaudited consolidated financial statements, management is required to make estimates, significant judgments and assumptions that affect the reported amounts of assets and liabilities as of the dates of the Consolidated Statements of Financial Condition and Consolidated Statements of Income for the periods presented. Actual results could differ from these judgments and estimates under different conditions, resulting in a change that could have a material impact on the carrying values of our assets and liabilities and our results of operations. Material estimates that involve significant judgments and assumptions that are particularly susceptible to change are the determination of the adequacy of the allowance for credit losses, evaluation of the need for valuation allowances on deferred tax assets, and determination of liabilities related to retirement and other post-retirement benefits. These estimates, significant judgments and assumptions are evaluated on an ongoing basis and are adjusted when facts and circumstances dictate.

    The interim unaudited consolidated financial statements reflect all normal and recurring adjustments, which are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. The results of operations for the three and nine months periods ended September 30, 2024 are not necessarily indicative of the results of operations that may be expected for the entire fiscal year or any other period.

    The interim unaudited consolidated financial statements of the Company presented herein have been prepared in accordance with the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and U.S. generally accepted accounting principles (“GAAP”). Certain information and note disclosures have been condensed or omitted pursuant to the rules and regulations of the SEC.
    These unaudited consolidated financial statements should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2023, and the audited consolidated financial statements included therein.