Basis of Presentation and Informational Disclosures (Policies) |
6 Months Ended |
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Jun. 30, 2026 | |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Basis of Presentation | Northwest Bancshares, Inc. (the “Company” or “Northwest”), a Maryland corporation headquartered in Columbus, Ohio, is a bank holding company regulated by the Board of Governors of the Federal Reserve Board (“Federal Reserve Board”). The primary activity of the Company is the ownership of all of the issued and outstanding common stock of Northwest Bank, a Pennsylvania-chartered savings bank (“Northwest Bank”). Northwest Bank is regulated by the Federal Deposit Insurance Corporation (“FDIC”) and the Pennsylvania Department of Banking and Securities. Northwest Bank operates 151 full-service financial centers and eleven free standing drive-up facilities in Pennsylvania, New York, Ohio and Indiana. The accompanying unaudited Consolidated Financial Statements include the accounts of the Company and its subsidiary, Northwest Bank, and Northwest’s subsidiaries Northwest Capital Group, Inc., Great Northwest Corporation, Mutual Federal Interest Corporation and the M Group, Inc. The unaudited Consolidated Financial Statements have been prepared in accordance with United States generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information or footnotes required for complete annual financial statements. In the opinion of management, all adjustments necessary for the fair presentation of the Company’s financial position and results of operations have been included. The Consolidated Financial Statements have been prepared using the accounting policies described in the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 updated, as required, for any new pronouncements or changes.
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| Allowance for Credit Losses and Provision for Credit Losses Update | Allowance for Credit Losses and Provision for Credit Losses Update During the quarter-ended June 30, 2026, the Bank implemented a new model to calculate the allowance for credit losses on our vehicle loan portfolio. This internally developed model uses loan, borrower, and collateral characteristics, and macroeconomic data as inputs and outputs monthly estimates of probability of default (PD), exposure at default (EAD), and loss given default (LGD). A given loan’s lifetime loss is a summarization of their monthly EAD x PD x LGD or expected loss. This change has been accounted for as a change in accounting estimates, with prospective application beginning in the period of change. This change in estimate did not materially impact the Company's results of operations or financial condition.
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| Reclassifications | Certain items previously reported have been reclassified to conform to the current year’s reporting format. |