Significant Accounting Policies (Policies) |
6 Months Ended | ||||||||||||||||||||||||
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Jun. 30, 2026 | |||||||||||||||||||||||||
| Accounting Policies [Abstract] | |||||||||||||||||||||||||
| Basis of Presentation and Consolidation | The consolidated financial statements include the accounts of Isabella Bank Corporation, a registered financial holding company, and its wholly owned banking subsidiary, Isabella Bank. All intercompany balances and accounts have been eliminated in consolidation. References to “we,” “our,” “us,” and “the Corporation” refer to Isabella Bank Corporation, a Michigan corporation and registered financial holding company, our wholly-owned banking subsidiary, Isabella Bank, and our other consolidated subsidiaries. References to “the Bank” refer to Isabella Bank.
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| Basis of Accounting | The accompanying unaudited interim condensed consolidated financial statements in this Form 10-Q have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In our opinion, all adjustments considered necessary for a fair presentation have been included. Operating results for the three and six-month periods ended June 30, 2026 are not necessarily indicative of the results that may be expected for the year ending December 31, 2026. For further information, refer to our Annual Report on Form 10-K for the year ended December 31, 2025, as filed with the SEC on March 13, 2026 (the “2025 Annual Report on Form 10-K”). All financial data presented in these notes, as well as in Management’s Discussion and Analysis of Financial Condition and Results of Operations of this Form 10-Q, including financial data presented in the tables and explanations thereof, are expressed in thousands except per share amounts and ratios and unless otherwise noted.
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| Identification and Classification Merger-Related Expenses | Merger-related expenses are costs incurred directly in connection with merger and acquisition activities and are expensed in the period in which the costs are incurred and services are received. The costs to issue equity securities associated with the Merger are netted against the value of the securities issued. Merger-related expenses are expected to include legal fees for negotiation and drafting of merger agreements, accounting and auditing fees related to due diligence and financial statement preparation, consulting fees for strategic advisory services specific to the merger, costs related to regulatory filings and compliance, expenses for integration planning and execution (including IT, systems integration, and contract terminations), severance and retention bonuses for employees affected by the Merger, and travel and accommodation expenses directly related to merger activities. | ||||||||||||||||||||||||
| Operating Segments | Segment information is prepared on the same basis that our Chief Executive Officer, who is our Chief Operating Decision Maker (“CODM”), manages our segments, evaluates financial results, and makes key operating decisions. While the CODM monitors the revenue streams of our various products and services, operations are managed, and financial performance is evaluated on a corporate-wide basis. Operating segments are aggregated into one as operating results for all segments are similar. Accordingly, all of the banking-related operations are considered by management to be aggregated in one reportable operating segment. The segment is also distinguished by the level of information provided to the CODM, who uses such information to review performance of various components of the business, which are then aggregated if operating performance, products and services, and geographical regions are similar. The CODM will evaluate the financial performance of our business components by evaluating revenue streams, significant expenses, and budget to actual results in assessing our reportable segment and in the determination of allocating resources. Further, the CODM uses revenue streams to evaluate product pricing and significant expenses to assess performance and evaluate return on assets. Consolidated net income is used to benchmark our results against our competitors. Benchmarking and monitoring of budget to actual results are used in assessing performance and in establishing compensation. Revenue from banking operations consists primarily of loan and investment interest, deposit related fees, and wealth fees. Interest expense, provision for credit losses, compensation, and occupancy and equipment costs provide the significant expenses in our banking operations. All operations are domestic.
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| Pending Accounting Standards | Pending Accounting Standards ASU No. 2024-03: “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” In November 2024, ASU No. 2024-03 was issued to improve the disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses (including purchases of inventory, employee compensation, depreciation, amortization, and depletion) in commonly presented expense captions (such as cost of sales, selling general and administrative expense, and research and development). The new authoritative guidance is effective for annual periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027, as clarified in ASU No. 2025-01 issued in January 2025. The new authoritative guidance under ASU No. 2024-03 is not expected to have a significant impact on our operations or financial statement disclosures.
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| Allowance for Credit Losses - Loans | The credit quality of our loan portfolio is continuously monitored and is reflected within the ACL for loans. The ACL is an estimate of expected losses inherent within our loan portfolio. The ACL is adjusted by a credit loss expense, which is reported in earnings, and reduced by the charge-off of loan amounts, net of recoveries. The ACL is evaluated on a regular basis for appropriateness. Our periodic review of the collectability of a loan considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. The primary factors behind the determination of the level of the ACL are specific allocations for loans individually evaluated, historical loss percentages, delinquency status, and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Determining the appropriateness of the allowance is complex and requires judgment by management about the effect of matters that are inherently uncertain. In future periods evaluations of the overall loan portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense in those future periods. The methodology for estimating the amount of expected credit losses reported in the ACL is described within Note 3, Loans and ACL, in the consolidated financial statements included within the 2025 Annual Report on Form 10-K. There have been no material changes to the ACL methodology in 2026.
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| Earnings Per Share | Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan, grant awards under the RSP, and purchase options under the ESPP.
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| Fair Value Measurement | Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:
The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods. Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally, we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.
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