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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation: The unaudited financial statements for the nine months ended September 30, 2025 include the consolidated results of operations of Mercantile Bank Corporation and its consolidated subsidiaries. These subsidiaries include Mercantile Community Partners, LLC ("MCP") and Mercantile Bank (“our bank”) and its subsidiaries, including Mercantile Insurance Center, Inc. These consolidated financial statements have been prepared in accordance with the instructions for Form 10-Q and Item 303(b) of Regulation S-K and do not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for a complete presentation of our financial condition and results of operations. In the opinion of management, the information reflects all adjustments (consisting only of normal recurring adjustments) which are necessary in order to make the financial statements not misleading and for a fair presentation of the results of operations for such periods. The results for the period ended September 30, 2025 should not be considered as indicative of results for a full year. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2024. We have five separate business trusts that were formed to issue trust preferred securities. Subordinated debentures were issued to the trusts in return for the proceeds raised from the issuance of the trust preferred securities. The trusts are not consolidated, but instead we report the subordinated debentures issued to the trusts as a liability.
Recent Events [Policy Text Block] | Recent Events: On July 22, 2025, we entered into a definitive merger agreement ("Merger Agreement") with Eastern Michigan Financial Corporation (“EFIN”), pursuant to which EFIN will merge with and into an acquisition subsidiary of Mercantile, with the acquisition subsidiary as the surviving corporation (the “Merger”). Following the Merger, Mercantile will operate for a period of time as a two-bank holding company. The newly acquired Eastern Michigan Bank will operate alongside Mercantile’s existing bank, Mercantile Bank, until the first quarter of 2027 at which time Mercantile plans to consolidate Eastern Michigan Bank into Mercantile Bank. Under the terms of the agreement, each outstanding share of EFIN’s common stock will be converted into the right to receive $32.32 in cash and 0.7116 shares of Mercantile common stock, for an aggregate transaction value of approximately $90.3 million based upon the closing price of Mercantile's common stock of $43.14 on October 16, 2025. The Merger Agreement has been approved by the boards of directors of each of Mercantile and EFIN. The parties anticipate that the Merger will close in the fourth quarter of 2025, subject to receiving approval of the Merger Agreement by EFIN’s shareholders and applicable regulatory agencies, and the fulfillment of other customary closing conditions.
Segment Reporting, Policy [Policy Text Block] | Operating Segments: We conduct our operations through a single business segment, which derives interest and noninterest income through our banking products and services and investment securities. All of our income relates to our operations in the United States. Segment assets represent total assets on our Consolidated Balance Sheets and segment net income represents net income on our Consolidated Statements of Income.
Earnings Per Share, Policy [Policy Text Block] | Earnings Per Share: Basic earnings per share is based on the weighted average number of common shares and participating securities outstanding during the period. Diluted earnings per share include the dilutive effect of additional potential common shares issuable under our stock-based compensation plans and are determined using the treasury stock method. Our unvested restricted shares, which contain non-forfeitable rights to dividends whether paid or accrued (i.e., participating securities), are included in the number of shares outstanding for both basic and diluted earnings per share calculations. In the event of a net loss, our unvested restricted shares are excluded from the calculation of both basic and diluted earnings per share. Approximately 277,000 unvested restricted shares were included in determining both basic and diluted earnings per share for the three and nine months ended September 30, 2025. Approximately 311,000 unvested restricted shares were included in determining both basic and diluted earnings per share for the three and nine months ended September 30, 2024.
Marketable Securities, Policy [Policy Text Block] | Debt Securities: Debt securities classified as held to maturity are carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities available for sale consist of bonds which might be sold prior to maturity due to a number of factors, including changes in interest rates, prepayment risks, yield, availability of alternative investments or liquidity needs. Debt securities classified as available for sale are reported at their fair value. For available for sale debt securities in an unrealized loss position, we first assess whether we intend to sell, or if it is more likely than not that we will be required to sell the security before recovery of the amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the debt security’s amortized cost basis is written down to fair value through income with the establishment of an allowance. For debt securities available for sale that do not meet the aforementioned criteria, we evaluate whether any decline in fair value is due to credit loss factors. In making this assessment, we consider any changes to the rating of the security by a rating agency and adverse conditions specifically related to the issuer of the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of the cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance is recognized in other comprehensive income (loss). Changes in the allowance are recorded as provisions for (or reversals of) credit losses. Losses are charged against the allowance when the collectability of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. At September 30, 2025, and December 31, 2024, there was no allowance related to the available for sale debt securities portfolio. Interest income includes amortization of purchase premiums and accretion of discounts. Premiums on debt securities are amortized to the initial call date, if applicable, or to the maturity date, on the level-yield method. Discounts on debt securities are accreted to the maturity date on the level-yield method. Premiums and discounts on mortgage-backed securities are amortized or accreted based on anticipated prepayments on the level-yield method. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Federal Home Loan Bank of Indianapolis (“FHLBI”) stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value.
Financing Receivable, Held-for-Investment [Policy Text Block] | Loans: Loans that we have the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of deferred loan fees and costs. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. Net unamortized deferred loan costs amounted to $1.7 million and $2.2 million at September 30, 2025, and December 31, 2024, respectively. Interest income on commercial loans and mortgage loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Consumer and credit card loans are typically charged off no later than when they are 120 days past due. Past due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal and interest is considered doubtful. Accrued interest is included in other assets in the Consolidated Balance Sheets. All interest accrued but not received for loans placed on nonaccrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Financing Receivable, Held-for-Sale [Policy Text Block] | Loans Held for Sale: Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by outstanding commitments from investors. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings. As of September 30, 2025 and December 31, 2024, we determined that the fair value of our mortgage loans held for sale totaled $17.7 million and $16.0 million, respectively. Mortgage loans held for sale are generally sold with servicing rights retained. Gains and losses on sales of mortgage loans are based on the difference between the selling price, which includes a gain or loss on the interest rate commitment coverage position, and the carrying value of the related loan sold, which is reduced by the cost allocated to the servicing right. Market rate risk on interest rate commitments with borrowers prior to loan closing is mitigated through forward commitments referred to as to-be-announced mortgage-backed securities. These mortgage banking activities are not designated as hedges and are carried at fair value. The net gain or loss on mortgage banking derivatives, which is generally nominal in dollar amount, is included in the gain on sale of loans and recorded as part of mortgage banking income.
Credit Loss, Financial Instrument [Policy Text Block] | Allowance for Credit Losses (“a llowance”): The allowance is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. The allowance is increased by a provision for credit losses and decreased by charge-offs, net of recoveries of amounts previously charged-off. Loans are charged-off against the allowance when we believe the uncollectability of a loan balance is confirmed. The allowance is measured on a collective pool basis when similar risk characteristics exist and on an individual basis when a loan exhibits unique risk characteristic which differentiate the loan from other loans within the loan segments. Loan segments are further discussed in Note 3 - Loans and Allowance for Credit Losses. The “remaining life methodology” is utilized for substantially all loan pools. This non-discounted cash flow approach projects an estimated future amortized cost basis based on current loan balance and repayment terms. Our historical loss rate is then applied to future loan balances at the instrument level based on remaining contractual life adjusted for amortization, prepayment and default to develop a baseline lifetime loss. The baseline lifetime loss is adjusted for changes in macroeconomic conditions over the reasonable and supportable forecast and reversion periods via a series of macroeconomic forecast inputs, such as gross domestic product, unemployment rates, interest rates, credit spreads, stock market volatility and property price indices, to quantify the impact of current and forecasted economic conditions on expected loan performance. Reasonable and supportable economic forecasts have to be incorporated in determining expected credit losses. The forecast period represents the time frame from the current period end through the point in time that we can reasonably forecast and support entity and environmental factors that are expected to impact the performance of our loan portfolio. Ideally, the economic forecast period would encompass the contractual terms of all loans; however, the ability to produce a forecast that is considered reasonable and supportable becomes more difficult or may not be possible in later periods. The contractual term generally excludes potential extensions, renewals and modifications. Subsequent to the end of the forecast period, we revert to historical loan data based on an ongoing evaluation of each economic forecast in relation to then current economic conditions as well as any developing loan loss activity and resulting historical data. We are not required to develop and use our own economic forecast model, and we elect to utilize economic forecasts from third-party providers that analyze and develop forecasts of the economy for the entire United States at least quarterly. During each reporting period, we also consider the need to adjust the historical loss rates as determined to reflect the extent to which we expect current conditions and reasonable and supportable economic forecasts to differ from the conditions that existed for the period over which the historical loss information was determined. These qualitative adjustments may increase or decrease our estimate of expected future credit losses. Our qualitative factors include: o Changes in lending policies and procedures o Changes in the nature and volume of the loan portfolio and in the terms of loans o Changes in the experience, ability and depth of lending management and other relevant staff o Changes in the volume and severity of past due loans, nonaccrual loans and adversely classified loans o Changes in the quality of the loan review program o Changes in the value of underlying collateral dependent loans o Existence and effect of any concentrations of credit and any changes in such o Effect of other factors such as competition and legal and regulatory requirements o Local or regional conditions that depart from the conditions and forecasts for the entire country The estimation of future credit losses should reflect consideration of all significant factors that affect the collectability of the loan portfolio at each evaluation date. While our methodology considers both the historical loss rates as well as the traditional qualitative factors, there may be instances or situations where additional qualitative factors need to be considered. Due to the relatively low level of loan losses during the look-back period, we have established a historical loss information factor that has been included in the qualitative factors that are included in the estimation of future credit losses in the periods presented. We recorded a provision for credit losses of $3.9 million and $5.9 million during the nine months ended September 30, 2025 and 2024, respectively. The provision expense recorded during the first nine months of 2025 primarily reflected a net increase in specific allocations, changes to the economic forecast, and a net increase in qualitative factors stemming from changes in the makeup of the loan portfolio. The impacts of these factors were partially offset by reductions in the reserve related to faster residential mortgage and consumer loan prepayment speeds and the associated reduced average lives of the portfolios and changes in baseline loss rates. The provision expense recorded during the first nine months of 2024 primarily reflected a specific allocation for a nonperforming commercial loan relationship, allocations necessitated by net loan growth, a change in the volume and severity of past due loans, nonaccrual loans and adversely classified loans for commercial and industrial loans and a change in the historical loss information qualitative factor for commercial loans, which more than offset the impacts of an improved economic forecast and changes to the loan portfolio composition. Accrued interest receivable on loans totaling $16.7 million and $17.3 million as of September 30, 2025 and December 31, 2024, respectively, is included in other assets on the Consolidated Balance Sheets. We elected not to measure an allowance for accrued interest receivable and instead elected to reverse interest income on loans that are placed on nonaccrual status, which is generally when loans become 90 days past due, or earlier if we believe the collection of interest is doubtful. We believe this policy results in the timely reversal of uncollectable interest. Identified problem loans, which exhibit characteristics (financial or otherwise) that could cause the loans to become nonperforming or require restructuring in the future, are included on an internal watch list. Senior management and the Board of Directors review this list regularly. In some cases, we may determine that an individual loan exhibits unique risk characteristics which differentiate the loan from other loans within the loan segments. In such cases, the loans are evaluated for expected credit losses on an individual basis and excluded from the collective evaluation. Specific reserve allocations of the allowance for credit losses are determined by analyzing the borrower’s ability to repay amounts owed and collateral deficiencies, among other things. For individually analyzed loans which are deemed to be collateral dependent loans, we adopted the practical expedient to measure the allowance based on the fair value of collateral. The allowance is calculated on an individual loan basis based on the shortfall between the fair value of the loan’s collateral and the recorded principal balance. If the fair value of the collateral exceeds the recorded principal balance, no allowance is required. Fair value estimates of collateral on individually analyzed loans, as well as on foreclosed and repossessed assets, are reviewed periodically. We also have a process in place to monitor whether value estimates at each quarter-end are reflective of current market conditions. Our credit policies establish criteria for obtaining appraisals and determining internal value estimates. We may also adjust outside and internal valuations based on identifiable trends within our markets, such as recent sales of similar properties or assets, listing prices and offers received. In addition, we may discount certain appraised and internal value estimates to address distressed market conditions. We are also required to consider expected credit losses associated with loan commitments over the contractual period in which we are exposed to credit risk on the underlying commitments unless the obligation is unconditionally cancellable by us. Any allowance for off-balance sheet credit exposures is reported as an other liability on our Consolidated Balance Sheets and is increased or decreased via other noninterest expense on our Consolidated Statements of Income. The calculation includes consideration of the likelihood that funding will occur and forecasted credit losses on commitments expected to be funded over their estimated lives. The allowance is calculated using the same aggregate reserve rates calculated for the funded portion of loans at the portfolio level applied to the amount of commitments expected to be funded.
Mortgage Banking Activity [Policy Text Block] | Mortgage Banking Activities: Mortgage loans serviced for others totaled $1.62 billion and $1.55 billion as of September 30, 2025 and December 31, 2024, respectively. Mortgage loan servicing rights are recognized as assets based on the allocated value of retained servicing rights on mortgage loans sold and totaled $13.1 million and $12.5 million as of September 30, 2025 and December 31, 2024, respectively. Mortgage loan servicing rights are carried at the lower of amortized cost or fair value and are expensed in proportion to, and over the period of, estimated net servicing revenues. Impairment is evaluated based on the fair value of the rights using groupings of the underlying mortgage loans as to interest rates. Any impairment of a grouping is reported as a valuation allowance. The fair value of mortgage servicing rights totaled $21.7 million and $21.0 million as of September 30, 2025 and December 31, 2024, respectively. Servicing fee income is recorded for fees earned for servicing mortgage loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. Amortization of mortgage loan servicing rights is netted against mortgage loan servicing income and recorded in mortgage banking activities in the Consolidated Statements of Income.
Derivatives, Policy [Policy Text Block] | Derivatives: Derivative financial instruments are recognized as assets or liabilities at fair value. The accounting for changes in the fair value of derivatives depends on the use of the derivatives and whether the derivatives qualify for hedge accounting. Used as part of our asset and liability management to help manage interest rate risk, our derivatives have generally consisted of interest rate swap agreements that qualified for hedge accounting. We do not use derivatives for trading purposes. Changes in the fair value of derivatives that are designated, for accounting purposes, as a hedge of the variability of cash flows to be received on various assets and liabilities and are effective are reported in other comprehensive income (loss). They are later reclassified into earnings in the same periods during which the hedged transaction affects earnings and are included in the line item in which the hedged cash flows are recorded. If hedge accounting does not apply, changes in the fair value of derivatives are recognized immediately in current earnings as interest income or expense. We had no derivative instruments designated as hedges as of September 30, 2025, and December 31, 2024.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] | Goodwill: The acquisition method of accounting requires that assets and liabilities acquired in a business combination be recorded at fair value as of the acquisition date. The valuation of assets and liabilities often involves estimates based on third-party valuations or internal valuations based on discounted cash flow analyses or other valuation techniques, all of which are inherently subjective. This typically results in goodwill, the amount by which the cost of net assets acquired in a business combination exceeds their fair value, which is subject to impairment testing at least annually. We review goodwill for impairment on an annual basis as of October 1 during the fourth quarter or more often if events or circumstances indicate that it is more-likely-than-not that the fair value of a reporting unit is below its carrying value. Based on our annual impairment analysis of goodwill as of October 1 during the fourth quarter, it was determined that the fair value was in excess of its respective carrying value as of October 1, 2024; therefore, goodwill is considered not impaired.
Revenue from Contract with Customer [Policy Text Block] | Revenue from Contracts with Customers: We record revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, we must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) we satisfy a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. Our primary sources of revenue are derived from interest and dividends earned on loans, securities and other financial instruments that are not within the scope of Topic 606. We have evaluated the nature of our contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Consolidated Statements of Income was not necessary. We generally satisfy our performance obligations on contracts with customers as services are rendered, and the transaction prices are typically fixed and charged either on a periodic basis (generally monthly) or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers. The following table depicts our sources of noninterest income presented in the Consolidated Statements of Income that are scoped within Topic 606:
|  | Three Months |  |  | Three Months |  |  | Nine Months |  |  | Nine Months |
|  | Ended |  |  | Ended |  |  | Ended |  |  | Ended |
(Dollars in thousands) |  | September 30, 2025 |  |  | September 30, 2024 |  |  | September 30, 2025 |  |  | September 30, 2024 |
Service charges on deposit and sweep accounts |  | $ | 2,064 |  |  | $ | 1,753 |  |  | $ | 5,871 |  |  | $ | 4,976 |
Credit and debit card income |  |  | 2,371 |  |  |  | 2,257 |  |  |  | 6,922 |  |  |  | 6,644 |
Interest rate swap fees |  |  | 377 |  |  |  | 389 |  |  |  | 1,687 |  |  |  | 2,494 |
Payroll services income |  |  | 825 |  |  |  | 713 |  |  |  | 2,648 |  |  |  | 2,295 |
Customer service fees |  |  | 298 |  |  |  | 231 |  |  |  | 674 |  |  |  | 611 |
Service Charges on Deposit and Sweep Accounts: We earn fees from deposit and sweep customers for account maintenance, transaction-based and overdraft services. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of the month reflecting the period over which we satisfy the performance obligation. Transaction-based fees, which include services such as stop payment and returned item charges, are recognized at the time the transaction is executed as that is the point in time we fulfill the customer request. Service charges on deposit and sweep accounts are withdrawn from the customer account balance. Credit and Debit Card Income: We earn interchange income on our cardholder debit and credit card usage. Interchange income is primarily comprised of fees whenever our debit and credit cards are processed through card payment networks such as Visa. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, concurrently with the transaction processing services provided to the cardholder. Interest Rate Swap Fees: We offer a loan swap program to certain commercial loan customers. Through this program, we originate a variable rate loan with the customer. We and the swap customer will then enter into a fixed interest rate swap. Separately, an identical offsetting swap is entered into by the Company with a counterparty. These “back-to-back” swap arrangements are intended to offset each other and allow us to book a variable rate loan, while providing the customer with a contract for fixed interest payments. Through this program, we receive an upfront, non-refundable fee from the counterparty, dependent upon the pricing, which is recognized upon receipt from the counterparty. Payroll Services Income: We earn fees from providing payroll processing services for our commercial clients. Fees are assessed for processing weekly or bi-weekly payroll files, reports and documents, as well as year-end tax-related files, reports and documents. Fees are recognized and collected as payroll processing services are completed for each payroll run and year-end processing activities. Customer Service Fees: We earn fees by providing a variety of other services to our customers, such as wire transfers, check ordering, sales of cashier checks and money orders, and rentals of safe deposit boxes. Generally, fees are recognized and collected daily, concurrently with the point in time we fulfill the customer request. Safe deposit box rentals are on annual contracts, with fees generally earned at the time of the contract signing or renewal. Customer service fees are recorded as other noninterest income on our Consolidated Statements of Income.

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