Consolidated Balance Sheets (Parentheticals) - $ / shares |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Preferred stock, par value (in dollars per share) | $ 0 | $ 0 |
| Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0 | $ 0 |
| Common stock, shares authorized (in shares) | 40,000,000 | 40,000,000 |
| Common stock, shares outstanding (in shares) | 17,181,096 | 16,146,374 |
| Common stock, shares issued (in shares) | 17,181,096 | 16,146,374 |
Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Net income | $ 88,753 | $ 79,593 | $ 82,217 |
| Other comprehensive income (loss): | |||
| Unrealized holding gains (losses) on securities available for sale | 32,697 | 836 | 18,804 |
| Total other comprehensive income (loss) | 32,697 | 836 | 18,804 |
| Tax effect of unrealized holding gains (losses) on securities available for sale | (6,867) | (174) | (3,950) |
| Total tax effect of other comprehensive income (loss) | (6,867) | (174) | (3,950) |
| Other comprehensive income (loss), net of tax effect | 25,830 | 662 | 14,854 |
| Comprehensive income (loss) | $ 114,583 | $ 80,255 | $ 97,071 |
Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Employee stock purchase plan (in shares) | 2,954 | 1,194 | 1,410 |
| Dividend reinvestment plan (in shares) | 16,848 | 19,684 | 27,306 |
| Stock grants to directors for retainer fees (in shares) | 10,007 | 11,316 | 11,529 |
| Cash dividends per common share (in dollars per share) | $ 1.5 | $ 1.4 | $ 1.34 |
| Common stock issued to acquire Eastern Michigan Financial Corp. (in shares) | 924,999 | ||
Award Timing Disclosure |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Award Tmg Disc Line Items | |
| Award Timing MNPI Considered [Flag] | true |
Insider Trading Arrangements |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 | |||
| Trading Arrangements, by Individual [Table] | |||
| Material Terms of Trading Arrangement [Text Block] |
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| Non-Rule 10b5-1 Arrangement Adopted [Flag] | false | ||
| Rule 10b5-1 Arrangement Adopted [Flag] | false | ||
| Rule 10b5-1 Arrangement Terminated [Flag] | false | ||
| Non-Rule 10b5-1 Arrangement Terminated [Flag] | false |
Insider Trading Policies and Procedures |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Insider Trading Policies and Procedures [Line Items] | |
| Insider Trading Policies and Procedures Adopted [Flag] | true |
Cybersecurity Risk Management and Strategy Disclosure |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Cybersecurity Risk Management, Strategy, and Governance [Line Items] | |
| Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] |
Risk Management and Strategy
Our enterprise risk management program is designed to identify, assess, and mitigate risks across various aspects of our company, including financial, operational, regulatory, reputational, and legal. Cybersecurity is a critical component of this program given the increasing reliance on technology and potential of cyber threats. Our Chief Information Security Officer (the "CISO") is primarily responsible for this cybersecurity component and is a key member of the risk management organization, reporting directly to the Senior Management Team (“SMT”) and our Tech Oversight Committee. Our Tech Oversight Committee includes members of our Board of Directors and management. Our CISO has served in this capacity for more than a decade and maintains multiple certifications issued by the Information Systems Audit and Control Association ("ISACA") and the SANS Institute. As part of our overall enterprise risk management program, we maintain both an Information & Cyber Security Program Policy (“ICSPP”) and Information & Cyber Security Incident Response Policy (“ICSIRP”).
Our ICSPP is overseen by the SMT, which is responsible for designating the CISO. The CISO is responsible for leading company-wide cybersecurity strategy, policy, standards, architecture, and processes. The CISO is charged with all logical security related matters, which include but are not limited to, PC/server security, network security, internet security, and database and application security. Our ICSIRP is based on applicable federal and state laws as well as cybersecurity incident response best practices. The purpose of the ICSIRP is to define procedures for reporting and responding to cybersecurity incidents. It creates objectives for actionable procedures that can be measured, evaluated, scaled and revised as necessary for each specific incident. These objectives include maximizing the effectiveness of our company's operations through an established plan of action and assigning responsibilities to appropriate personnel and/or -party contractors.
Our company has engaged a -party managed detection and response company to monitor the security of our information systems around-the-clock, including intrusion detection and response, and to provide instantaneous alerting should a cybersecurity event occur. If a cybersecurity threat or cybersecurity incident is identified through our company's information systems, the CISO and Incident Response Team (“IRT”) will take immediate steps to mitigate the threat and assess any damages. Upon report from the CISO, the SMT will evaluate the materiality of the cybersecurity threat or cybersecurity incident to determine if any public disclosures are required under the Security and Exchange Commission’s cybersecurity disclosure rule. If deemed necessary, third-party consultants, legal counsel, and assessors will be engaged to evaluate the materiality assessment.
Our company has training and awareness programs designed to educate its employees about cybersecurity risks and how to protect our company, our customers and themselves from cyber-attacks and to keep its employees informed about cybersecurity threats and how to stay safe online, including secure access practice, phishing schemes, remote work and response to suspicious activities.
Our cybersecurity program interfaces with other functional areas within our company, including but not limited to, our company's business segments and information technology, legal, risk, human resources and internal audit departments, as well as external third-party partners, to identify and understand potential cybersecurity threats. We regularly assess and update our processes, procedures and management techniques in light of ongoing cybersecurity developments.
Recognizing the complexity and evolving nature of cybersecurity threats, we also engage with a range of external experts, including cybersecurity assessors, consultants, and auditors in evaluating and testing our risk management systems. These partnerships enable our company to leverage specialized knowledge and insights, ensuring its cybersecurity strategies and processes remain at the forefront of industry best practices. Our company's collaboration with these third parties includes regular audits, testing, threat assessments and consultation on security enhancements. To date, risks from cybersecurity threats or incidents have not materially affected our company. However, the sophistication of and risks from cybersecurity threats and incidents continue to increase, and the preventative actions that we have taken and continue to take to reduce the risk of cybersecurity threats and incidents and protect our systems and information may not successfully protect against all cybersecurity threats and incidents. For more information on how cybersecurity risk could materially affect our company's business strategy, results of operations, or financial condition, please refer to Item 1A Risk Factors. |
| Cybersecurity Risk Management Processes Integrated [Flag] | true |
| Cybersecurity Risk Management Processes Integrated [Text Block] | Our enterprise risk management program is designed to identify, assess, and mitigate risks across various aspects of our company, including financial, operational, regulatory, reputational, and legal. Cybersecurity is a critical component of this program given the increasing reliance on technology and potential of cyber threats. Our Chief Information Security Officer (the "CISO") is primarily responsible for this cybersecurity component and is a key member of the risk management organization, reporting directly to the Senior Management Team (“SMT”) and our Tech Oversight Committee. Our Tech Oversight Committee includes members of our Board of Directors and management. Our CISO has served in this capacity for more than a decade and maintains multiple certifications issued by the Information Systems Audit and Control Association ("ISACA") and the SANS Institute. As part of our overall enterprise risk management program, we maintain both an Information & Cyber Security Program Policy (“ICSPP”) and Information & Cyber Security Incident Response Policy (“ICSIRP”). |
| Cybersecurity Risk Management Third Party Engaged [Flag] | true |
| Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] | true |
| Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] | false |
| Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block] | To date, risks from cybersecurity threats or incidents have not materially affected our company. However, the sophistication of and risks from cybersecurity threats and incidents continue to increase, and the preventative actions that we have taken and continue to take to reduce the risk of cybersecurity threats and incidents and protect our systems and information may not successfully protect against all cybersecurity threats and incidents. For more information on how cybersecurity risk could materially affect our company's business strategy, results of operations, or financial condition, please refer to Item 1A Risk Factors. |
| Cybersecurity Risk Board of Directors Oversight [Text Block] |
Governance
Our Board of Directors has tasked the SMT with overseeing efforts to develop, implement and maintain an effective information and cybersecurity program. The SMT designates the CISO, who also serves as the IRT leader. As part of its oversight responsibilities, our Board of Directors is responsible for discussing with the SMT our company’s major risk exposures, such as cybersecurity, and the steps management has taken to monitor and control those exposures, including our risk assessment and risk management policies. Our Board of Directors also monitors our compliance with legal and regulatory requirements and the risks associated therewith. On a regular basis, our Tech Oversight Committee reviews with the SMT significant areas of risk exposure involving cybersecurity.
At the direction of the SMT, the CISO, and IRT monitor internal and external cybersecurity threats and review and revise our company’s cybersecurity defenses on an ongoing basis. The CISO, together with other members of the IRT, bring a wealth of expertise to their respective roles, including expertise in security technologies; designing and implementing security strategies; security standards such as NIST, ISO, COBIT and ITIL; and risk management and incident response. The CISO prepares reports on IT general controls and cybersecurity metrics for the SMT and Tech Oversight Committee periodically. Our Board of Directors meets with the CISO periodically to discuss cybersecurity. |
| Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block] | Our Board of Directors has tasked the SMT with overseeing efforts to develop, implement and maintain an effective information and cybersecurity program. The SMT designates the CISO, who also serves as the IRT leader. As part of its oversight responsibilities, our Board of Directors is responsible for discussing with the SMT our company’s major risk exposures, such as cybersecurity, and the steps management has taken to monitor and control those exposures, including our risk assessment and risk management policies. Our Board of Directors also monitors our compliance with legal and regulatory requirements and the risks associated therewith. On a regular basis, our Tech Oversight Committee reviews with the SMT significant areas of risk exposure involving cybersecurity. |
| Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] | Our Board of Directors has tasked the SMT with overseeing efforts to develop, implement and maintain an effective information and cybersecurity program. The SMT designates the CISO, who also serves as the IRT leader. As part of its oversight responsibilities, our Board of Directors is responsible for discussing with the SMT our company’s major risk exposures, such as cybersecurity, and the steps management has taken to monitor and control those exposures, including our risk assessment and risk management policies. Our Board of Directors also monitors our compliance with legal and regulatory requirements and the risks associated therewith. On a regular basis, our Tech Oversight Committee reviews with the SMT significant areas of risk exposure involving cybersecurity. |
| Cybersecurity Risk Role of Management [Text Block] | Our Board of Directors has tasked the SMT with overseeing efforts to develop, implement and maintain an effective information and cybersecurity program. The SMT designates the CISO, who also serves as the IRT leader. As part of its oversight responsibilities, our Board of Directors is responsible for discussing with the SMT our company’s major risk exposures, such as cybersecurity, and the steps management has taken to monitor and control those exposures, including our risk assessment and risk management policies. Our Board of Directors also monitors our compliance with legal and regulatory requirements and the risks associated therewith. On a regular basis, our Tech Oversight Committee reviews with the SMT significant areas of risk exposure involving cybersecurity. |
| Cybersecurity Risk Management Positions or Committees Responsible [Flag] | true |
| Cybersecurity Risk Management Positions or Committees Responsible [Text Block] | Our Board of Directors has tasked the SMT with overseeing efforts to develop, implement and maintain an effective information and cybersecurity program. The SMT designates the CISO, who also serves as the IRT leader. As part of its oversight responsibilities, our Board of Directors is responsible for discussing with the SMT our company’s major risk exposures, such as cybersecurity, and the steps management has taken to monitor and control those exposures, including our risk assessment and risk management policies. Our Board of Directors also monitors our compliance with legal and regulatory requirements and the risks associated therewith. On a regular basis, our Tech Oversight Committee reviews with the SMT significant areas of risk exposure involving cybersecurity. |
| Cybersecurity Risk Management Expertise of Management Responsible [Text Block] | Our company recognizes the importance of safeguarding company and customer information. Therefore, our Board of Directors recognizes that the protection of this information ranks as one of our highest priorities. Our Board of Directors is responsible for reviewing and approving the ICSPP and ICSIRP at least annually and monitoring material risks facing our company. In January 2025, our Board of Directors added a member who possesses specialized expertise in cybersecurity matters. Director Sara A. Schmidt currently serves as chief information security officer for US Foods and executive sponsor of the West Michigan Cyber Security Consortium. |
| Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block] | At the direction of the SMT, the CISO, and IRT monitor internal and external cybersecurity threats and review and revise our company’s cybersecurity defenses on an ongoing basis. The CISO, together with other members of the IRT, bring a wealth of expertise to their respective roles, including expertise in security technologies; designing and implementing security strategies; security standards such as NIST, ISO, COBIT and ITIL; and risk management and incident response. The CISO prepares reports on IT general controls and cybersecurity metrics for the SMT and Tech Oversight Committee periodically. Our Board of Directors meets with the CISO periodically to discuss cybersecurity. |
| Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] | true |
Note 1 - Summary of Significant Accounting Policies |
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| Notes to Financial Statements | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Significant Accounting Policies [Text Block] |
NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Principles of Consolidation: The consolidated financial statements include the accounts of Mercantile Bank Corporation (“Mercantile”) and its subsidiaries, Mercantile Bank and Eastern Michigan Bank (collectively "our banks"), and Mercantile Community Partners LLC ("MCP"), and of Mercantile Insurance Center, Inc. (“our insurance company”), a subsidiary of Mercantile Bank, after elimination of significant intercompany transactions and accounts.
Mercantile has five separate business trusts: Mercantile Bank Capital Trust I, Firstbank Capital Trust I, Firstbank Capital Trust II, Firstbank Capital Trust III and Firstbank Capital Trust IV (“our trusts”). Our trusts were formed to issue trust preferred securities. We issued subordinated debentures to our trusts in return for the proceeds raised from the issuance of the trust preferred securities. Our trusts are not consolidated, but instead we report the subordinated debentures issued to the trusts as liabilities.
Nature of Operations: Mercantile was incorporated on July 15, 1997, to establish and own Mercantile Bank based in Grand Rapids, Michigan. Mercantile Bank began operations on December 15, 1997. Mercantile Bank completed the merger of Firstbank Corporation, a Michigan corporation with approximately $1.5 billion in total assets and 46 branch locations, into Mercantile as of June 1, 2014. On December 31, 2025, Mercantile completed the merger of Eastern Michigan Financial Corporation, and its wholly owned banking subsidiary, Eastern Michigan Bank, with approximately $572 million in total assets and 11 branch locations. Mercantile will operate for a period of time as a two-bank holding company. The newly acquired Eastern Michigan Bank will operate alongside Mercantile Bank until the first quarter of 2027, at which time Mercantile plans to consolidate Eastern Michigan Bank into Mercantile Bank.
Mercantile is a financial holding company whose principal activity is the ownership and management of Mercantile Bank and Eastern Michigan Bank. Both Mercantile Bank and Eastern Michigan Bank are community-based financial institutions. Their primary deposit products are checking, saving, and term certificate accounts, and their primary lending products are commercial loans, residential mortgage loans, and instalment loans. Substantially all loans are secured by specific items of collateral, including business assets, real estate or consumer assets. Commercial loans are expected to be repaid from cash flow from operations of businesses. Real estate loans are secured by commercial or residential real estate. We have no material foreign loans or significant overdraft balances. Our banks' loan accounts and retail deposits are primarily with customers located in the communities in which we have bank office locations. As an alternative source of funds, our banks have also issued certificates of deposit to depositors outside of their primary market areas.
Our insurance company acquired an existing shelf insurance agency effective April 15, 2002. An Agency and Institution Agreement was entered into among our insurance company, Mercantile Bank and Hub International for the purpose of providing programs of mass marketed personal lines of insurance. Insurance product offerings include private passenger automobile, homeowners, personal inland marine, boat owners, recreational vehicle, dwelling fire, umbrella policies, small business and life insurance products, all of which are provided by and written through companies that have appointed Hub International as their agent. To date, we have not provided the insurance products noted above and currently have no plans to do so.
We have evaluated subsequent events for potential recognition and/or disclosure through the date these financial statements were issued.
Use of Estimates: To prepare financial statements in conformity with accounting principles generally accepted in the United States of America, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. The allowance for credit losses and the fair value measurements are particularly subject to change.
Cash and Cash Equivalents and Cash Flow Reporting: Cash and cash equivalents include cash on hand, demand deposits with other financial institutions, short-term investments and federal funds sold. Cash flows are reported net for customer loan and deposit transactions, interest-earning deposits invested with other financial institutions and short-term borrowings with maturities of 90 days or less.
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.
Changes in the allowance are recorded as provisions for (or reversals of) credit loss expense. Losses are charged against the allowance when the collectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. At December 31, 2025, there was allowance related to the available for sale debt securities portfolio.
Interest income includes amortization of purchase premiums and accretion of discounts. Premiums and discounts on securities are amortized or accreted on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method.
on available for sale debt securities totaling $5.5 million and $3.6 million at December 31, 2025 and 2024, respectively, was reported in other assets on the Consolidated Balance Sheets. Management has made the accounting policy election to exclude accrued interest receivable on available for sale securities from the estimate of credit losses as accrued interest is written off in a timely manner when deemed uncollectible.
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 adjusted for partial charge-offs and the allowance, net of deferred loan fees and costs and purchase premiums and discounts. Interest income on loans is accrued over the term of the loans primarily using the simple interest method based on the principal balance outstanding. Accrued interest is included in other assets in the Consolidated Balance Sheets. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
The December 31, 2025, acquisition of Eastern Michigan Bank resulted in the recognition of $1.5 million of net purchased loan discounts. Purchased loan discounts were measured at the time of acquisition based upon the difference between the initial amortized cost basis and the par value of the loan. The premiums and discounts will be amortized into interest income over the life of the loans.
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 $1.3 million and $2.2 million at December 31, 2025 and 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. 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.
Commercial Loan Participations: As part of our credit risk administration practices and to manage exposure limits, we engage in commercial loan participations with other financial institutions from time-to-time. In all instances, the commercial loans are participated at par with no loan yield adjustments; therefore, no gain or loss on sale, or servicing right, is recorded. We retain a large portion of the loan exposure and continue to service the lending relationship. Commercial loan participations aggregated $71.8 million and $48.6 million as of December 31, 2025 and 2024, respectively.
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. 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 and the carrying value of the related mortgage loan sold, which is reduced by the cost allocated to the servicing right.
Year-end mortgage loans held for sale were as follows:
Mortgage Loan Derivatives: We enter into forward contracts and interest rate lock commitments in the ordinary course of business, which are accounted for as derivatives. The derivatives are not designated as hedges and are carried at fair value. The net gain or loss on derivatives is included in mortgage banking activities in the Consolidated Statements of Income. The net balance of mortgage loan derivatives aggregated to an asset of $0.3 million as of December 31, 2025, and an asset of $0.1 million as of December 31, 2024.
Mortgage Banking Activities: Income derived from mortgage banking activities include the net gain on sale of mortgage loans, originated mortgage servicing rights, and servicing fee income net of mortgage servicing rights amortization expense. The net gain on sale of mortgage loans represents the premium received in excess of the unpaid principal balance plus net origination fees.
Originated mortgage loan servicing rights are recorded at fair value at the time of sale and amortized in proportion to, and over the period of, estimated net servicing revenues. At each period end, 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. We have identified four classes of mortgage servicing rights based on the initial term of the underlying mortgage loans: 10 years, 15 years, 20 years and 30 years. We distinguish between these classes based on the differing sensitivities to the change in value from changes in mortgage interest rates. Any impairment of a grouping is reported as a valuation allowance. Servicing fees are earned for servicing mortgage loans and are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned.
Interest rate risk, prepayment risk and default risk are inherent in mortgage servicing rights valuations. Interest rate changes largely drive prepayment rates. Refinance activity generally increases as interest rates decline. A significant decrease in interest rates beyond expectation could cause a decline in the value of mortgage servicing rights. On the contrary, borrowers are less likely to refinance or prepay their mortgage loans if interest rates increase, which would extend the duration of the underlying mortgage loans and the associated mortgage servicing rights value would likely rise. Because of these risks, discount rates and prepayment speeds are used to estimate the fair value of mortgage servicing rights.
Allowance for Credit Losses (“allowance”): 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 provision expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. Loans are charged-off against the allowance when we believe the uncollectibility 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 characteristics that 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 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:
The estimation of future credit losses should reflect consideration of all significant factors that affect the collectibility 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. Effective January 1, 2022, we established a historical loss information factor to address the relatively low level of loan losses during the look-back period.
Purchased loans are recorded at fair value at the time of acquisition and distinguished between purchased seasoned loans ("PSL"), purchased credit deteriorated loans ("PCD loans"), and non-seasoned new acquisitions. PSL are loans purchased at least 90 days after its original origination date and without significant credit deterioration. PCD loans are acquired loans that have experienced a more-than-insignificant decline in credit quality since their origination. We considered all loans that were currently 60 days or more past due, ever on nonaccrual status, had ever been past due three or more times, consumer loans with borrower credit scores below 600, or commercial loans rated monitor, special mention, substandard or doubtful to be PCD loans. There were no non-seasoned new acquisition loans during 2025, 2024 and 2023.
PSL and PCD loans are accounted for using the gross-up approach prescribed in Accounting Standards Codification 326, Financial Instruments - Credit Losses. The gross-up approach requires recognition of an allowance for the estimate of credit losses at the acquisition date. The allowance is recorded with an offsetting gross-up adjustment to the purchase price of the acquired financial asset.
Accrued interest receivable on loans totaling $17.5 million and $17.3 million as of December 31, 2025 and 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 the loan becomes 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 uncollectible 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 that 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 that 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 its 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 Statement 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.
Transfers of Financial Assets: Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when: (1) the assets have been isolated from our banks and put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) our banks do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Our transfers of financial assets are generally limited to commercial loan participations sold and residential mortgage loans sold in the secondary market.
Premises and Equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Buildings and related components are depreciated using the straight-line method with useful lives ranging from 5 to 33 years. Furniture, fixtures and equipment are depreciated using the straight-line method with useful lives ranging from 3 to 7 years. Maintenance, repairs and minor alterations are charged to current operations as expenditures occur and major improvements are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable based on future undiscounted cash flows. If impaired, the assets are recorded at the lower of carrying value or fair value.
Foreclosed Assets: Assets acquired through or in lieu of foreclosure are initially recorded at their estimated fair value net of estimated selling costs, establishing a new cost basis. If fair value subsequently declines, a valuation allowance is recorded through noninterest expense, as are collection and operating costs after acquisition. We had no foreclosed assets as of December 31, 2025 and 2024.
Bank Owned Life Insurance: Our banks have purchased life insurance policies on certain key officers. Bank owned life insurance is recorded at its cash surrender value, or the amount that can be realized. Increases in the net cash surrender value of the policies, as well as insurance proceeds received, are recorded as noninterest income on the Consolidated Statements of Income and are not subject to income taxes.
Goodwill: The acquisition method of accounting requires that assets and liabilities acquired in a business combination to 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 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, it was determined that the fair value was in excess of its respective carrying value as of October 1, 2025; therefore, goodwill was considered not impaired. Subsequent to the analysis of goodwill, on December 31, 2025, we acquired Eastern Michigan Financial Corporation, resulting in the recognition of $23.2 million of goodwill. Goodwill recognized from the acquisition of Eastern Michigan Financial Corporation is further discussed in Note 17 - Business Combinations.
Repurchase Agreements: Our banks sell certain securities under agreements to repurchase. The agreements are treated as collateralized financing transactions, with the obligations to repurchase the securities sold reflected as liabilities and the securities underlying the agreements remaining in assets in the Consolidated Balance Sheets.
Financial Instruments and Loan Commitments: Financial instruments include off-balance-sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Instruments, such as standby letters of credit, that are considered financial guarantees are recorded at fair value. Reserves for unfunded commitments are recorded as an other liability on our Consolidated Balance Sheets.
Stock-Based Compensation: Compensation cost for equity-based awards is measured on the grant date based on the fair value of the award on that date and recognized over the requisite service period, net of estimated forfeitures. Fair value of stock option awards is estimated using a closed option valuation (Black-Scholes) model. Fair value of restricted stock awards is based upon the quoted market price of the common stock on the date of grant.
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 for the years ended December 31, 2025, 2024 and 2023 that are scoped within Topic 606:
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 Fees: 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.
Payroll Processing Fees: 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 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.
Advertising Costs: Advertising costs are expensed as incurred.
Income Taxes: Income tax expense is the total of the current year income tax due or refundable, the change in deferred income tax assets and liabilities, and any adjustments related to unrecognized tax benefits. Deferred income tax assets and liabilities are recognized for the tax consequences of temporary differences between the carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates applicable to future years. A valuation allowance, if needed, reduces deferred income tax assets to the amount expected to be realized.
Fair Values of Financial Instruments: Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates. The fair value estimates of existing on- and off-balance sheet financial instruments do not include the value of anticipated future business or the values of assets and liabilities not considered financial instruments.
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 using the treasury stock method. Our unvested stock awards, which contain non-forfeitable rights to dividends whether paid or unpaid (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 stock awards are excluded from the calculations of both basic and diluted earnings per share. There were no dilutive shares outstanding during the years ended December 31, 2025, 2024 and 2023. Weighted average common shares outstanding were 16,237,974, 16,130,696, and 16,015,678 during the years ended December 31, 2025, 2024 and 2023.
Comprehensive Income (Loss): Comprehensive income (loss) consists of net income and other comprehensive income (loss). Accumulated other comprehensive gain/(loss) includes unrealized gains and losses on securities available for sale. Accumulated other comprehensive gain/(loss) was comprised of the following as of December 31, 2025, 2024 and 2023:
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 historically 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. 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 December 31, 2025 and 2024.
Contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. We do not believe there are any such matters outstanding that would have a material effect on the financial statements.
Recent Accounting Changes Adopted: Accounting Standards Updated No. 2025-08, Financial Instruments - Credit Losses (Topic 326): Purchased Loans. This update expands the population of acquired financial instruments subject to the gross-up approach in Topic 326. In accordance with the amendments in this update, loans (excluding credit cards) acquired without credit deterioration and deemed "seasoned" are purchased seasoned loans and accounted for using the gross-up approach at acquisition. This update takes effect for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods with adoption being applied prospectively to loans that are acquired on or after the initial application date. We have adopted the standard and included the required disclosures in our financial statements.
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Note 2 - Securities |
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| Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] |
NOTE 2 – SECURITIES
The amortized cost and fair value of available for sale securities and the related pre-tax gross unrealized gains and losses recognized in accumulated other comprehensive gain/(loss) were as follows at year-end 2025 and 2024:
Securities with unrealized losses at year-end 2025 and 2024, aggregated by investment category and length of time that individual securities have been in a continuous loss position, are as follows:
We evaluate securities in an unrealized loss position at least quarterly. Consideration is given to the financial condition of the issuer, and the intent and ability we have to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. For those debt securities whose fair value is less than their amortized cost basis, we also consider our intent to sell the security, whether it is more likely than not that we will be required to sell the security before recovery and if we do not expect to recover the entire amortized cost basis of the security. In analyzing an issuer’s financial condition, we may consider whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred and the results of reviews of the issuer’s financial condition.
At December 31, 2025, 607 debt securities with estimated fair values totaling $545 million had unrealized losses aggregating $36.9 million. At December 31, 2024, 843 debt securities with estimated fair values totaling $680 million had unrealized losses aggregating $63.8 million. At December 31, 2025, unrealized losses aggregating $31.1 million were attributable to bonds issued or guaranteed by agencies of the U.S. federal government, while unrealized losses totaling $5.7 million were associated with bonds issued by state-based municipalities. After considering the issuers of the bonds and taking into account the fact that no municipal issuer had been subject to a credit rating downgrade by bond credit rating agencies, we determined that the unrealized losses were due to changing interest rate environments. As we do not intend to sell our debt securities before recovery of their cost basis and we believe it is more likely than not that we will not be required to sell our debt securities before recovery of the cost basis, no unrealized losses are deemed to represent credit losses.
The amortized cost and fair values of debt securities at December 31, 2025, by maturity, are shown in the following table. The contractual maturity is utilized for U.S. Treasury notes and bonds, U.S. Government agency debt obligations and municipal bonds. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date, primarily mortgage-backed securities, are shown separately.
No securities were sold during the last three years.
Securities issued by the State of Michigan and all its political subdivisions had a combined amortized cost of $252 million and $219 million at December 31, 2025 and December 31, 2024, respectively, with estimated market values of $249 million and $209 million at the respective dates. Securities issued by all other states and their political subdivisions had both a combined amortized cost and estimated fair value of $31.3 million as of December 31, 2025. We had no securities issued by all other states and their political subdivisions as of December 31, 2024. Total securities of any other specific issuer, other than the U.S. Government and its agencies and the State of Michigan and all its political subdivisions, did not exceed 10% of shareholders’ equity.
The carrying value of U.S. Government agency debt obligations and mortgage-backed securities that are pledged to secure repurchase agreements was $232 million and $122 million at December 31, 2025 and 2024, respectively. The carrying value of U.S. Government agency debt obligations that are pledged to secure specific customer deposits was $12.6 million and $11.7 million as of December 31, 2025 and 2024, respectively.
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Note 3 - Loans and Allowance for Credit Losses |
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| Loans, Notes, Trade and Other Receivables Disclosure [Text Block] |
NOTE 3 – LOANS AND ALLOWANCE FOR CREDIT LOSSES
Commercial loans are divided among five segments based primarily on collateral type, risk characteristics, and primary and secondary sources of repayment. These segments are then further stratified based on the commercial loan grade that is assigned using our standard loan grading paradigm. Retail loans are divided into one of two groups based on risk characteristics and source of repayment. Our allowance for credit loss pools are consistent with those used for loan note disclosure purposes.
Our loan portfolio segments as of December 31, 2025 were as follows:
Year-end loans disaggregated by class of loan within the loan portfolio segments were as follows:
Concentrations within the loan portfolio were as follows at year end:
An age analysis of past due loans is as follows as of December 31, 2025:
An age analysis of past due loans is as follows as of December 31, 2024:
Nonaccrual loans as of December 31, 2025 were as follows:
Nonaccrual loans represent the entire balance of collateral dependent loans. As of December 31, 2025 and 2024, all collateral dependent loans were secured by real estate, with the exception of those classified as commercial and industrial, which were secured by accounts receivable, inventory, and equipment. Interest income recognized on nonaccrual loans totaled $1.0 million in 2025, $0.3 million in 2024 and $0.2 million in 2023, reflecting the collection of interest at the time of principal pay-off.
Nonaccrual loans as of December 31, 2024 were as follows:
Nonaccrual loans as of December 31, 2023 were as follows:
Credit Quality Indicators. We utilize a comprehensive grading system for our commercial loans. All commercial loans are graded on a ten grade rating system. The rating system utilizes standardized grade paradigms that analyze several critical factors such as cash flow, operating performance, financial condition, collateral, industry condition and management. All commercial loans are reviewed and graded at inception and, if appropriate, re-graded at various intervals thereafter. The risk assessment for retail loans is primarily based on the type of collateral.
Loans by credit quality indicators were as follows as of December 31, 2025:
Commercial credit exposure – credit risk profiled by internal credit risk grades:
Retail credit exposure – credit risk profiled by collateral type:
Loans by credit quality indicators were as follows as of December 31, 2024:
Commercial credit exposure – credit risk profiled by internal credit risk grades:
Retail credit exposure – credit risk profiled by collateral type:
All commercial loans are graded using the following criteria:
The primary risk elements with respect to commercial loans are the financial condition of the borrower, the sufficiency of collateral, and timeliness of scheduled payments. We have a policy of requesting and reviewing periodic financial statements from commercial loan customers and employ a disciplined and formalized review of the existence of collateral and its value. The primary risk element with respect to each residential real estate loan and consumer loan is the timeliness of scheduled payments; loans 90 days or more past due are considered nonperforming. We have a reporting system that monitors past due loans and have adopted policies to pursue creditors’ rights in order to preserve our collateral position.
The following table reflects loan balances as of December 31, 2025 based on year of origination:
There were lines of credit with principal balances of $0.7 million as of December 31, 2024 that were converted to term loans during 2025.
The following table reflects loan balances as of December 31, 2024 based on year of origination:
There were lines of credit with principal balances of $9.1 million as of December 31, 2023 that were converted to term loans during 2024.
Mercantile Bank uses a migration to loss methodology to determine historical loss rates for commercial loans given the comprehensive loan grading process employed by Mercantile Bank for over two decades, while an open pool approach is best suited for retail loans given the smaller dollar size of the segments. A baseline loss rate is produced at each reporting date for each loan portfolio segment using bank-specific loan charge-off and recovery data over a defined historical look-back period. The look-back period represents the number of data periods that will be used to calculate a baseline loss rate for each loan portfolio segment. We determined that the look-back period commencing on January 1, 2011 through the reporting date was reasonable and appropriate for the calculation of historical loss rates for both December 31, 2025 and 2024.
Mercantile Bank's 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. Our prepayment speed assumptions are developed at the loan segment level based upon the consideration of all relevant data in which we believe will impact anticipated customer behavior including changes in interest rates, economic conditions, and underlying property valuations. For the commercial loan portfolio segments, we assumed a 2% prepayment speed as of both December 31, 2025 and 2024 as we deemed there to be no considerable changes from historical experience. For the retail 1-4 family mortgage and retail other consumer portfolios, we increased the prepayment speed from 7.8% as of December 31, 2024 to 9.5% as of December 31, 2025. This increase shortened the average lives of the portfolios in which the loss rates were applied, resulting in a decrease to the allowance of $2.3 million. This change in assumption was driven by lower long-term interest rates and the compositions of the underlying portfolios.
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. As of December 31, 2025 and 2024, we used a one-year reasonable and supportable economic forecast period, with a six-month straight-line reversion period for all loan segments. The economic forecasts used for our December 31, 2025 and 2024 allowance calculations reflected allowance balance reductions of $0.3 million and $2.2 million, respectively.
The allowance for PSL and PCD loans acquired from the acquisition of Eastern Michigan Bank were measured at the loan segment level using proxy expected lifetime loss rates adjusted for qualitative risk factors, including lending management experience, loan review and audit results, asset quality and portfolio trends, loan portfolio growth, industry concentrations, trends in underlying collateral, external factors, and economic conditions not already captured.
Individual loans exhibiting unique risk characteristics, which differentiate the loans from other loans within the loan segments and are evaluated for expected credit losses on an individual basis, totaled $7.9 million and $7.4 million as of December 31, 2025 and 2024, respectively. Individual allowance allocations totaled $4.0 million and $2.2 million as of December 31, 2025 and 2024, respectively.
The allowance for credit losses for the year ended December 31, 2025 is as follows:
The allowance for credit losses for the year ended December 31, 2024 is as follows:
The allowance for credit losses for the year ended December 31, 2023 is as follows:
The following table presents the period-end amortized cost basis of modifications to borrowers experiencing financial difficulty by type of modification made during the year ended:
Loans listed under Term Extension were generally granted a series of short-term maturity extensions as part of the workout process and associated forbearance agreement.
The following table presents the period-end amortized cost basis of loans that have been modified in the past twelve months as of December 31, 2025, to borrowers experiencing financial difficulty by payment status and loan segment:
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Note 4 - Premises and Equipment, Net |
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| Property, Plant and Equipment Disclosure [Text Block] |
NOTE 4 - PREMISES AND EQUIPMENT, NET
Year-end premises and equipment were as follows:
Depreciation expense totaled $5.2 million for 2025, and $6.0 million for both 2024 and 2023.
We enter into facility leases in the normal course of business. As of December 31, 2025, we were under lease contracts for eleven of our branch facilities. The leases have maturity dates ranging from August, 2026 through May, 2048, with a weighted average life of 9.4 years as of December 31, 2025. All of our leases have multiple - to -year extensions; however, these were not factored in the lease maturities and weighted average lease term as it is not reasonably certain we will exercise the options.
Leases are classified as either operating or finance leases at the lease commencement date, with all of our current leases determined to be operating leases. Lease expense for operating leases is recognized on a straight-line basis over the lease term. Right-of-use assets represent our right to use an underlying asset for the lease term, while lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and lease liabilities are recognized at the lease commencement date at the estimated present value of lease payments over the lease term. We use our incremental borrowing rate, on a collateralized basis, at lease commencement to calculate the present value of lease payments. The weighted average discount rate for leases was 6.52% as of December 31, 2025.
The right-of-use assets, included in on our Consolidated Balance Sheets, and the lease liabilities, included in on our Consolidated Balance Sheets, totaled $3.9 million and $4.4 million as of December 31, 2025, and December 31, 2024, respectively. As permitted by applicable accounting standards, we have elected not to recognize short-term leases with original terms of twelve months or less on our Consolidated Balance Sheets. Total operating lease expense associated with the leases aggregated $1.6 million, $1.6 million and $2.0 million in 2025, 2024 and 2023, respectively.
Future lease payments were as follows as of December 31, 2025:
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Note 5 - Mortgage Loan Servicing |
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| Mortgage Loan Servicing [Text Block] |
NOTE 5 – MORTGAGE LOAN SERVICING
Mortgage loans serviced for others are not reported as assets on the Consolidated Balance Sheets. The year-end aggregate unpaid principal balances of mortgage loans serviced for others were as follows:
Custodial escrow balances, which are reported as deposits on the Consolidated Balance Sheets, maintained in connection with serviced loans were $14.5 million and $10.9 million as of December 31, 2025 and 2024, respectively.
Activity for capitalized mortgage loan servicing rights, which are reported as other assets on the Consolidated Balance Sheets, during 2025 and 2024 was as follows:
Mortgage servicing rights result from our mortgage loan origination activities. Late and ancillary fees, included as part of mortgage banking income and reported as noninterest income in the Consolidated Statements of Income, aggregated less than $0.1 million during 2025 and 2024.
We determined that no valuation allowance was necessary as of December 31, 2025 or December 31, 2024. The estimated fair value of mortgage servicing rights was $21.4 million and $21.0 million as of December 31, 2025 and 2024, respectively. The fair value of mortgage servicing rights is estimated using a valuation model that calculates the present value of estimated future net servicing cash flows, taking into consideration expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. As of December 31, 2025, fair value was determined using a discount rate of 10.00%, a weighted average constant prepayment rate of 9.13%, depending on the stratification of the specific right, and a weighted average delinquency rate of 0.76%. As of December 31, 2024, fair value was determined using a discount rate of 10.50%, a weighted average constant prepayment rate of 7.81%, depending on the stratification of the specific right, and a weighted average delinquency rate of 0.68%.
The weighted average amortization period was 8.2 years and 8.7 years as of December 31, 2025 and 2024, respectively.
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Note 6 - Deposits |
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| Deposit Liabilities Disclosures [Text Block] |
NOTE 6 – DEPOSITS
Deposits at year end are summarized as follows:
Out-of-area time deposits consist of deposits obtained from depositors outside of our primary market areas exclusively through deposit brokers.
The following table depicts the maturity distribution for time deposits at year end:
Time deposits of more than $250,000 totaled $551 million and $570 million at year-end 2025 and 2024, respectively.
Deposit overdrafts, which are reported as loans on the Consolidated Balance Sheets, totaled $0.6 million and $1.0 million as of December 31, 2025 and 2024, respectively. |
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Note 7 - Securities Sold Under Agreements to Repurchase |
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| Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] |
NOTE 7 – SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
Information regarding securities sold under agreements to repurchase at year end is summarized below:
Securities sold under agreements to repurchase (“repurchase agreements”) generally have original maturities of less than year. Repurchase agreements are treated as financings, and the obligations to repurchase securities sold are reflected as liabilities on our Consolidated Balance Sheets. Repurchase agreements are secured by securities with an aggregate fair value equal to the aggregate outstanding balance of the repurchase agreements. The securities, which are included in securities available for sale on our Consolidated Balance Sheets, are held in safekeeping by a correspondent bank. Repurchase agreements are offered principally to certain large deposit customers. |
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Note 8 - Other Borrowings |
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| Debt Disclosure [Text Block] |
NOTE 8 - OTHER BORROWINGS
FHLBI bullet advances totaled $300 million at December 31, 2025, and were expected to mature at varying dates from January 2026 through June 2030, with fixed rates of interest from 0.90% to 4.50% and averaging 3.27%. FHLBI bullet advances totaled $360 million at December 31, 2024, and were expected to mature at varying dates from January 2025 through January 2029, with fixed rates of interest from 0.70% to 4.54% and averaging 3.10%.
Maturities of FHLBI bullet advances as of December 31, 2025 were as follows:
FHLBI amortizing advances totaled $26.2 million and $27.1 million as of December 31, 2025 and 2024, respectively, with an average fixed rate of 2.52% and maturities in 2042. FHLBI amortizing advances are obtained periodically to assist in managing interest rate risk associated with certain longer-term fixed rate commercial loans, with annual principal payments that closely align with the scheduled amortization of the underlying commercial loans.
Scheduled principal payments on FHLBI amortizing advances as of December 31, 2025 were as follows:
Each advance is payable at its maturity date, and is subject to a prepayment fee if paid prior to the maturity date. The advances are collateralized by residential mortgage loans, first mortgage liens on multi-family residential property loans, first mortgage liens on commercial real estate property loans, and substantially all other assets of Mercantile Bank under a blanket lien arrangement. Our borrowing line of credit as of December 31, 2025 totaled $1.08 billion, with remaining availability based on collateral of $777 million.
On December 15, 2021, we entered into Subordinated Note Purchase Agreements with certain institutional accredited investors pursuant to which we issued and sold $75.0 million in aggregate principal amount of 3.25% fixed-to-floating rate subordinated notes (“Notes”). The Notes have a stated maturity of January 30, 2032, and are redeemable by us at our option, in whole or in part, on or after January 30, 2027 on any interest payment date at a redemption of price of 100% of the principal amount of the Notes being redeemed. The Notes are not subject to redemption at the option of the holder. The Notes will bear interest at a fixed rate of 3.25% per year until January 29, 2027. Commencing on January 30, 2027 and through the stated maturity date of January 30, 2032, the interest rate will reset quarterly at a variable rate equal to the then-current Three-Month Term plus 212 basis points. On December 15, 2021, we injected $70.0 million of the issuance proceeds into Mercantile Bank as an increase to equity capital.
On January 14, 2022, we issued an additional $15.0 million of Notes to certain institutional accredited investors, reflecting an expansion of the $75.0 million issuance completed on December 15, 2021. The additional $15.0 million issuance was completed on the same terms as the prior offering and under the existing indenture. On January 14, 2022, we injected $15.0 million of the issuance proceeds into Mercantile Bank as an increase to equity capital.
Our unamortized debt issuance costs were $0.3 million and $0.7 million as of December 31, 2025 and 2024, respectively.
On December 24, 2025, we entered into a credit agreement with U.S. Bank National Association for a $30.0 million term note. The term loan bears interest at an annual rate equal to 1.70% plus the greater of (a) zero percent (0.0%) and (b) the one-month forward-looking term rate based on SOFR. Interest and principal are payable beginning March 15, 2026, and on the same date of each third month thereafter, plus a final payment equal to all unpaid interest and principal. Principal shall be paid in installments of $2.5 million each. The term loan matures on December 24, 2028. Mercantile is permitted to prepay the term note evidencing the term loan in full or in part at any time without indemnity, premium or penalty. |
Note 9 - Federal Income Taxes |
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| Income Tax Disclosure [Text Block] |
NOTE 9 - FEDERAL INCOME TAXES
Pretax income is entirely related to domestic activities; we did not have any foreign operations, tax expense or tax benefits. The consolidated income tax expense was as follows:
A reconciliation of the differences between the federal income tax expense recorded and the amount computed by applying the federal statutory rate to income before income taxes were as follows:
The statutory tax rate was 21% for 2025, 2024 and 2023. We did not record any state income taxes.
Significant components of deferred tax assets and liabilities, included in other assets on our Consolidated Balance Sheets, as of December 31, 2025 and 2024 were as follows:
As of December 31, 2025, we had net operating loss carryforwards of $7.3 million related to the acquisition of Eastern Michigan Financial Corporation. The ability to utilize the net operating loss in future periods is limited based on the value of Eastern Michigan Financial Corporation's value at the time of the ownership change and applicable federal rates. A valuation allowance related to deferred tax assets is required when it is considered more likely than not that all or part of the benefits related to such assets will not be realized. We determined that no valuation allowance was required at year-end 2025 or 2024.
We had unrecognized tax benefits at any time during 2025 or 2024. Should the accrual of any interest or penalties relative to unrecognized tax benefits be necessary, it is our policy to record such accruals in our income tax accounts; such accruals existed at any time during 2025 or 2024. We are no longer no longer subject to examination by taxing authorities for years before 2022.
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Note 10 - Stock-based Compensation |
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| Share-Based Payment Arrangement [Text Block] |
NOTE 10 – STOCK-BASED COMPENSATION
Stock-based compensation plans are used to provide directors and employees with an increased incentive to contribute to our long-term performance and growth, to align the interests of directors and employees with the interests of our shareholders through the opportunity for increased stock ownership and to attract and retain directors and employees. Stock-based compensation, reported as noninterest expense in the Consolidated Statements of Income, totaled $3.5 million, $3.3 million and $3.4 million in 2025, 2024 and 2023, respectively. The Stock Incentive Plan of 2023 that was approved by shareholders in May, 2023.
Under the Stock Incentive Plan of 2023, incentive awards may include, but are not limited to, stock options, restricted stock, stock appreciation rights and stock awards. Incentive awards that are stock options or stock appreciation rights are granted with an exercise price not less than the closing price of our common stock on the date of grant. Price, vesting and expiration date parameters are determined by Mercantile’s Compensation Committee on a grant-by-grant basis. No payments are required from employees for restricted stock awards. The restricted stock awards granted during the years 2023 through 2025 fully vest after three years and, in the case of performance-based restricted stock issued to executive officers in 2023 through 2025, are subject to the attainment of pre-determined performance goals. At year-end 2025, there were approximately 292,600 shares authorized for future incentive awards.
A summary of restricted stock activity during the year ended December 31, 2025 is as follows:
Of the restricted stock shares granted in 2025 and 2023, a total of 16,589 shares and 25,239 shares, respectively, are performance-based awards made to our Named Executive Officers at the target level and are subject to the attainment of pre-determined performance goals. There were no shares granted in 2024.
We periodically grant shares of common stock to our Corporate and Bank Board Directors for retainer payments with the related expense being recorded over the period of the Directors' service, as summarized below:
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Note 11 - Related Parties |
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| Related Party Transactions Disclosure [Text Block] |
NOTE 11 – RELATED PARTIES
Certain directors and executive officers of our banks, including their immediate families and companies in which they are principal owners, were loan customers of our banks. At year-end 2025 and 2024, our banks had $11.3 million and $20.4 million in loan commitments to directors and executive officers, of which $6.3 million and $7.8 million were outstanding at year-end 2025 and 2024, respectively, as reflected in the following table.
Related party deposits and repurchase agreements totaled $36.6 million and $17.9 million at year-end 2025 and 2024, respectively.
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Note 12 - Commitments and Off-balance-sheet Risk |
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| Commitments Contingencies and Guarantees [Text Block] |
NOTE 12 – COMMITMENTS AND OFF-BALANCE-SHEET RISK
We are a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of our customers. These financial instruments include commitments to extend credit and standby letters of credit. Loan commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Standby letters of credit are conditional commitments issued by our banks to guarantee the performance of a customer to a third party. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.
These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized, if any, in the balance sheet. Our maximum exposure to loan loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual notional amount of those instruments. We use the same credit policies in making commitments and conditional obligations as we do for on-balance sheet instruments. Collateral, such as accounts receivable, securities, inventory, and property and equipment, is generally obtained based on management’s credit assessment of the borrower.
We are 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.
For commercial lines of credit, retail lines of credit and credit card average outstanding balances, we determined allowance requirements by calculating the difference between the average percent outstanding of the funded commitments over the past several years to actual percent outstanding at period end and applying the respective expected loss allocation factors to the difference as this difference represents the average of unfunded commitments we expect to eventually be drawn upon. For commitments to make loans, we determine an allowance by applying the expected loss allocation factor to the amount expected to fund. The calculated allowance aggregated $2.3 million and $1.0 million as of December 31, 2025 and 2024, respectively. We do not reserve for residential mortgage construction loans, as the loans are for one year or less and draws are governed by the receipt and satisfactory review of contractor and subcontractor sworn statements, lien waivers and title insurance company endorsements. Letters of credit are rarely drawn.
NOTE 12 – COMMITMENTS AND OFF-BALANCE-SHEET RISK (Continued)
At year-end 2025 and 2024, the rates on existing off-balance sheet instruments were substantially equivalent to current market rates, considering the underlying credit standing of the counterparties.
Our maximum exposure to credit losses for loan commitments and standby letters of credit outstanding at year end was as follows:
Commitments to make commercial loans generally reflect our binding obligations to existing and prospective customers to extend credit, including line of credit facilities secured by accounts receivable and inventory, and term loans secured by either real estate or equipment.
In most instances, commercial line of credit facilities have terms ranging from 12 to 24 months with floating rates tied to the Wall Street Journal Prime Rate or 30-Day SOFR. Commercial term loans secured by real estate are generally at a floating rates tied to the Wall Street Journal Prime Rate or 30-Day SOFR. Since the fourth quarter of 2020, a fixed rate option for commercial term loans secured by real estate is generally not offered for loans over $2.5 million; instead, customers are offered participation in our back-to-back interest rate swap program to achieve a desired fixed rate. For loans under $2.5 million, we offer a rate primarily equal to the commensurate cost of funds using FHLBI advance rates as a proxy and a credit spread as indicated by the credit rating we assign. Commercial term loans secured by real estate generally balloon within years, with payments based on amortizations ranging from 10 to 25 years. Commercial term loans secured by non-real estate collateral are generally at a floating rate tied to the Wall Street Journal Prime Rate or 30-Day SOFR, or a fixed rate primarily equal to the commensurate cost of funds using FHLBI advance rates as a proxy and a credit spread as indicated by the credit rating we assign, and generally mature and fully amortize within to years.
The following standby letters of credit are considered financial guarantees under current accounting guidance. These instruments are carried at fair value as an other liability on our Consolidated Balance Sheets. Standby letters of credit are generally cross collateralized with the borrowers’ other loans with us, and are included in our borrower collateral analyses.
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Note 13 - Benefit Plans |
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Dec. 31, 2025 | |
| Notes to Financial Statements | |
| Retirement Benefits [Text Block] |
NOTE 13 – BENEFIT PLANS
We have a 401(k) benefit plan that covers substantially all of our employees. The percent of our matching contributions to the 401(k) benefit plan is determined annually by the Board of Directors. The matching contribution has been 5.00% since April 1, 2018. Matching contributions, if made, are immediately vested. Our 2025, 2024 and 2023 matching 401(k) contributions charged to expense were $2.8 million, $2.6 million and $2.3 million, respectively.
We have a deferred compensation plan in which all persons serving on the Board of Directors may defer all or portions of their annual retainer and meeting fees, with distributions to be paid upon termination of service as a director or specific dates selected by the director. We also have non-qualified deferred compensation programs in which selected officers may defer all or portions of salary and bonus payments. The deferred amounts, which totaled $1.8 million and $1.3 million as of December 31, 2025 and 2024, respectively, are categorized as other liabilities in the Consolidated Balance Sheets. Interest expense was $0.1 million during 2025, and less than $0.1 million during 2024 and 2023.
The Mercantile Bank Corporation Employee Stock Purchase Plan of 2025 is a non-compensatory plan intended to encourage full- and part-time employees of Mercantile and its subsidiaries to promote our best interests and to align employees’ interests with the interests of our shareholders by permitting employees to purchase shares of our common stock with 5% discount through regular payroll deductions. Shares are purchased on the last business day of each calendar quarter at a price equal to the lower of 95% of the closing price of our common stock reported on The Nasdaq Stock Market on the first business day of each quarter and last business day of the quarter. A total of 200,000 shares of common stock may be issued under the existing plan; however, the number of shares may be adjusted to reflect any stock dividends and other changes in our capitalization. The number of shares issued totaled 2,356 in 2025. As of December 31, 2025, there were approximately 198,000 shares available under our current plan.
The Mercantile Bank Corporation Employee Stock Purchase Plan of 2014 was a non-compensatory plan intended to encourage full- and part-time employees of Mercantile and its subsidiaries to promote our best interests and to align employees’ interests with the interests of our shareholders by permitting employees to purchase shares of our common stock through regular payroll deductions. The number of shares issued totaled 598 and 1,194 in 2025 and 2024, respectively. |
Note 14 - Derivatives and Hedging Activities |
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| Derivative Instruments and Hedging Activities Disclosure [Text Block] |
NOTE 14 – DERIVATIVES AND HEDGING ACTIVITIES
We are exposed to certain risks arising from both business operations and economic conditions. We principally manage the exposure to a wide variety of operational risks through core business activities. Economic risks, including interest rate, liquidity and credit risk, are primarily administered via the amount, sources and duration of assets and liabilities. Derivative financial instruments may also be used to assist in managing economic risks.
Derivatives not designated as hedges are not speculative and result from a service provided to certain commercial loan borrowers. We execute interest rate swaps with commercial banking customers desiring longer-term fixed rate loans, while simultaneously entering into interest rate swaps with correspondent banks to offset the impact of the interest rate swaps with the commercial banking customers. The net result is the desired floating rate loans and a minimization of the risk exposure of the interest rate swap transactions. These swap agreements are cross collateralized with the underlying loans.
As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the commercial banking customer interest rate swaps and the offsetting interest rate swaps with the correspondent banks are recognized directly to earnings. Fees paid to us by the correspondent banks are recognized as noninterest income on our Consolidated Statements of Income on the settlement date.
The fair values of derivative instruments as of December 31, 2025, are reflected in the following table.
The effect of interest rate swaps that are not designated as hedging instruments resulted in expense of less than $0.1 million during the year ended December 31, 2025 that was recorded in other noninterest expense on our Consolidated Statement of Income. We have master netting arrangements with our correspondent banks that allow us to net receivables and payables. The netting agreement also allows us to net related cash collateral received and transferred up to the fair value exposure amount. We have elected to not offset these transactions on the Consolidated Balance Sheets. The netting of derivative instruments as of December 31, 2025 is presented in the following table.
The fair values of derivative instruments as of December 31, 2024, are reflected in the following table.
The effect of interest rate swaps that are not designated as hedging instruments resulted in expense of less than $0.1 million during the year ended December 31, 2024 that was recognized in other noninterest expense on our Consolidated Statement of Income. The netting of derivative instruments as of December 31, 2024 is presented in the following table.
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Note 15 - Fair Values of Financial Instruments |
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| Fair Value Disclosures [Text Block] |
NOTE 15 – FAIR VALUES OF FINANCIAL INSTRUMENTS
Carrying amount, estimated fair value and level within the fair value hierarchy of financial instruments were as follows at year end:
Carrying amount is the estimated fair value for cash and cash equivalents, FHLBI stock, accrued interest receivable and payable, noninterest-bearing checking accounts and securities sold under agreements to repurchase. Security fair values are based on market prices or dealer quotes, and if no such information is available, on the rate and term of the security and information about the issuer. Fair value for loans is based on an exit price model as required by ASU 2016-01, taking into account inputs such as discounted cash flows, probability of default and loss given default assumptions. Fair value for deposit accounts other than noninterest-bearing checking accounts is based on discounted cash flows using current market rates applied to the estimated life. The fair values of subordinated debentures, subordinated notes, and FHLBI advances are based on current rates for similar financing. The fair values of interest rate swaps are based on discounted cash flows using forecasted yield curves, along with insignificant unobservable inputs, such as borrower credit spreads. The fair value of other off-balance sheet items is estimated to be nominal.
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Note 16 - Fair Value Measurements |
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| Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] |
NOTE 16 – FAIR VALUE MEASUREMENTS
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability, or in the absence of a principal market, the most advantageous market for the asset or liability. The price of the principal (or most advantageous) market used to measure the fair value of the asset or liability is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.
We are required to use valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert future amounts, such as cash flows or earnings, to a single present amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect our own estimates about the assumptions market participants would use in pricing the asset or liability based on the best information available in the circumstances. In that regard, we utilize a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:
Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that we have the ability to access as of the measurement date.
Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be derived from or corroborated by observable market data by correlation or other means.
Level 3: Significant unobservable inputs that reflect our own estimates about the assumptions that market participants would use in pricing an asset or liability.
The following is a description of our valuation methodologies used to measure and disclose the fair values of our financial assets and liabilities on a recurring or nonrecurring basis:
Securities available for sale. Securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based on quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models. Level 2 securities include U.S. Government agency debt obligations, mortgage-backed securities issued or guaranteed by U.S. Government agencies, and municipal general obligation and revenue bonds. Level 3 securities include bonds issued by certain relatively small municipalities located within our markets that have very limited marketability due to their size and lack of ratings from a recognized rating service. We carry these bonds at historical cost, which we believe approximates fair value, unless our periodic financial analysis or other information that becomes known to us necessitates an impairment. There was no such impairment as of December 31, 2025 or 2024. We have no Level 1 securities available for sale.
Derivatives. We measure fair value utilizing models that use primarily market observable inputs, such as forecasted yield curves. Insignificant unobservable inputs, such as borrower credit spreads, are also utilized.
Mortgage loans held for sale. Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or market, as determined by outstanding commitments from investors, and are measured on a nonrecurring basis. Fair value is based on independent quoted market prices, where applicable, or the prices for other mortgage whole loans with similar characteristics. As of December 31, 2025 and 2024, we determined the fair value of our mortgage loans held for sale to be $17.3 million and $16.0 million, respectively.
Loans. We do not record loans at fair value on a recurring basis. However, from time to time, we record nonrecurring fair value adjustments to collateral dependent loans to reflect partial write-downs or specific reserves that are based on the observable market price or current estimated value of the collateral. These loans are reported in the nonrecurring table below at initial recognition of significant borrower distress and on an ongoing basis until recovery or charge-off. The fair values of distressed loans are determined using either the sales comparison approach or income approach; respective unobservable inputs for the approaches consist of adjustments for differences between comparable sales and the utilization of appropriate capitalization rates.
Foreclosed assets. At time of foreclosure or repossession, foreclosed and repossessed assets are adjusted to fair value less costs to sell upon transfer of the loans to foreclosed and repossessed assets, establishing a new cost basis. We subsequently adjust estimated fair value of foreclosed assets on a nonrecurring basis to reflect write-downs based on revised fair value estimates. The fair values of parcels of other real estate owned are determined using either the sales comparison approach or income approach; respective unobservable inputs for the approaches consist of adjustments for differences between comparable sales and the utilization of appropriate capitalization rates.
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2025 are as follows:
There were no sales or purchases of Level 3 during 2025. The $0.4 million reduction in Level 3 municipal general obligation bonds during 2025 reflects the transfer to Level 2 due to a change in observable inputs.
The balances of assets and liabilities measured at fair value on a recurring basis as of December 31, 2024 are as follows:
There were no sales, purchases or transfers in or out of Level 3 during 2024. The $0.1 million reduction in Level 3 municipal general obligation bonds during 2024 reflects the scheduled maturities of such bonds.
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
The balances of assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2025 are as follows:
The balances of assets and liabilities measured at fair value on a nonrecurring basis as of December 31, 2024 are as follows:
The carrying values are based on the estimated value of the property or other assets. Fair value estimates of collateral on collateral dependent loans and foreclosed assets are review periodically. Our credit policies establish criteria for obtaining appraisals and determining internal value estimates. We may also adjust outside appraisals and internal evaluations based on identifiable trends within our markets, such as sales of similar properties or assets, listing prices and offers received. In addition, we may discount certain appraised and internal value estimates to address current distressed market conditions. Typically, for real estate dependent loans and foreclosed assets, we assign a discount factor range of 25% to 50%. During 2025, weighted average discount factors of 40.9% and 25.8% were used for commercial-related and residential-related properties, respectively.
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Note 17 - Business Combinations |
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| Business Combination [Text Block] |
NOTE 17 – BUSINESS COMBINATIONS
On December 31, 2025, Mercantile completed its acquisition of Eastern Michigan Financial Corporation, and its wholly owned banking subsidiary, Eastern Michigan Bank, in accordance with the Agreement and Plan of Merger, as amended (the "Merger Agreement") by and between Mercantile, Eastern Michigan Financial Corporation, and Shamrock Merger Sub LLC, a wholly-owned special purpose subsidiary of Mercantile (“Merger Sub”) entered into on July 22, 2025. Pursuant to the Merger Agreement, Eastern Michigan Financial Corporation merged with and into Merger Sub, with Merger Sub continuing as the surviving entity (the “Merger”). Immediately following the Merger, and also effective as of December 31, 2025, Merger Sub merged with and into Mercantile, with Mercantile continuing as the surviving entity. The newly acquired Eastern Michigan Bank will operate alongside Mercantile Bank until the first quarter of 2027, at which time Mercantile plans to consolidate Eastern Michigan Bank into Mercantile Bank.
Mercantile accounted for the Eastern Michigan Financial Corporation acquisition as a business combination using the acquisition method of accounting in accordance with ASC 805, Business Combinations ("ASC 805"). ASC 805 requires assets purchased and liabilities assumed to be recorded at their respective fair values as of the date of acquisition. Mercantile determined the fair value of loans, core deposit intangibles, mortgage servicing rights, time deposits, and real property with the assistance of third-party valuations and appraisals. The following table summarizes the preliminary fair value of the total consideration transferred and the fair value of identifiable assets acquired, and liabilities assumed as of the effective date of the transaction:
As permitted by ASC 805, the above preliminary estimates may be refined during the measurement period (which cannot exceed one year from the Merger date), to reflect any new information obtained about facts and circumstances existing at the Merger date. Any changes in the above preliminary estimates will be recognized in the period identified.
The following table presents supplemental pro-forma information as if the acquisition had occurred at the beginning of 2024. The unaudited pro forma information includes adjustments for interest income on loans acquired, amortization of intangibles arising from the transaction, depreciation expense on property acquired, interest expenses on deposits acquired, and the related income tax effects. The pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transaction effected on the assumed dates.
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Note 18 - Variable Interest Entities |
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| Variable Interest Entity Disclosure [Text Block] |
NOTE 18 – VARIABLE INTEREST ENTITIES
Variable interest entities ("VIEs") are entities that either have a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors lack the characteristics of a controlling financial interest (i.e., ability to make significant decisions, through voting rights, right to receive the expected residual returns of the entity, and obligations to absorb the expected losses of the entity). Variable interest entities can be structured as corporations, trusts, partnerships, or other legal entities. We have relationships with certain variable interest entities related to the issuance of trust preferred securities and our tax credit investments.
We have five business trusts that are wholly owned subsidiaries of Mercantile, four of which were assumed by Mercantile in conjunction with the Firstbank Corporation merger in 2014. A fair value discount of $15.0 million was recorded at the time of the merger, which is being amortized at $0.7 million annually over the following 21.5 years, 11 of which are remaining. Each of the trusts was solely formed to issue preferred securities that were sold in private sales. Through a small common stock investment, we own 100% of the voting equity shares of each trust. The proceeds from the preferred securities and common stock sales were used by the trusts to purchase Floating Rate Notes issued by Mercantile. The rates of interest, interest payment dates, call features and maturity dates of each Floating Rate Note are identical to its respective Preferred Securities. The net proceeds from the issuance of the Floating Rate Notes were used for a variety of purposes, including contributions to Mercantile Bank as capital to provide support for asset growth and the funding of stock repurchase programs and certain acquisitions.
The assets, liabilities, operations and cash flows of each trust are solely related to the issuance, administration and repayment of the preferred securities held by third-party investors. We fully and unconditionally guarantee the obligations of each trust and are obligated to redeem the junior subordinated debentures upon maturity. We do not consolidate the trusts as we are not the primary beneficiary of these entities because our wholly-owned and indirect wholly-owned statutory subsidiaries do not have the power to direct the activities of the variable interest entity that most significantly impact the variable interest entity’s economic performance and do not have an obligation to absorb losses or the right to receive benefits that could potentially be significant to the variable interest entity. As such, we do not have a controlling financial interest in the variable interest entities.
The only significant assets of our trusts are the Floating Rate Notes, and the only significant liabilities of our trusts are the Preferred Securities. The Floating Rate Notes are categorized on our Consolidated Balance Sheets as subordinated debentures and the interest expense is recorded on our Consolidated Statements of Income under interest expense on other borrowings.
On January 26, 2016, we closed on a repurchase of trust preferred securities that were auctioned as part of a pooled collateralized debt obligation (“Fund”). The Fund owned $11.0 million of the $32.0 million in trust preferred securities that had been issued by Mercantile Bank Capital Trust I. The $11.0 million in trust preferred securities was retired upon the repurchase, resulting in a commensurate reduction in the related Floating Rate Junior Subordinate Note, leaving $21.0 million outstanding.
The following table depicts our five business trusts as of December 31, 2025:
The LIHTC and HTC investment entities are considered VIEs as MCP, or our banks, whomever is the holder of the equity investment at risk, does not have the ability to direct the activities that most significantly affect the performance of the entity through voting rights or similar rights. MCP, or our banks, could absorb losses that are significant to the underlying entities as it has a risk of loss for its capital contributions and funding commitments to each. The general partners, or managing members, are considered the primary beneficiaries as managerial functions give them the power to direct the activities that most significantly impact the entities’ economic performances, and the managing members are exposed to all losses beyond MCP’s, or our banks', initial capital contributions and funding commitments. We account for these entities using the proportional amortization method with the investment assets amortized in proportion to the income tax credits received in the current period as compared to the total income tax credit benefits expected to be received over the life of the investment.
Equity investments as a limited liability member in LIHTC and HTC investment entities, reported as in the Consolidated Balance Sheets, totaled $51.5 million and $38.9 million as of December 31, 2025 and 2024, respectively. Unfunded capital commitments, reported as other liabilities in the Consolidated Financial Statements, totaled $31.1 million and $34.4 million as of December 31, 2025 and 2024, respectively.
The following table summarizes quantitative information about our involvement in unconsolidated variable interest entities at year end:
As of December 31, 2025, our expected payments for unfunded contributions related to investments in tax credit equity investments were as follows:
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Note 19 - Regulatory Matters |
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| Regulatory Capital Requirements under Banking Regulations [Text Block] |
NOTE 19 - REGULATORY MATTERS
We are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators about components, risk weightings, and other factors, and the regulators can lower classifications in certain cases. Failure to meet various capital requirements can initiate regulatory action that could have a direct material effect on the financial statements.
The prompt corrective action regulations provide five classifications, including well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If an institution is not well capitalized, regulatory approval is required to accept brokered deposits. Subject to limited exceptions, no institution may make a capital distribution if, after making the distribution, it would be undercapitalized. If an institution is undercapitalized, it is subject to close monitoring by its principal federal regulator, its asset growth and expansion are restricted, and plans for capital restoration are required. In addition, further specific types of restrictions may be imposed on the institution at the discretion of the federal regulator. At year-end 2025 and 2024, our banks were in the well capitalized category under the regulatory framework for prompt corrective action. There are no conditions or events since December 31, 2025 that we believe have changed our banks' categorizations.
Under the final BASEL III capital rules that became effective on January 1, 2015, there is a requirement for a common equity Tier 1 capital conservation buffer of 2.5% of risk-weighted assets which is in addition to the other minimum risk-based capital standards in the rule. Institutions that do not meet this required capital buffer will become subject to progressively more stringent limitations on the percentage of earnings that can be paid out in cash dividends or used for stock repurchases and on the payment of discretionary bonuses to senior executive management. The capital buffer requirement was phased in over three years beginning in 2016. The capital buffer requirement raised the minimum required common equity Tier 1 capital ratio to 7.0%, the Tier 1 capital ratio to 8.5% and the total capital ratio to 10.5% on a fully phased-in basis on January 1, 2019. We believe that, as of December 31, 2025, our banks meet all capital adequacy requirements under the BASEL III capital rules on a fully phased-in basis.
Federal and state banking laws and regulations place certain restrictions on the amount of dividends our banks can transfer to Mercantile and on the capital levels that must be maintained. At year-end 2025, under the most restrictive of these regulations, Mercantile Bank could distribute $12.0 million and Eastern Michigan Bank could distribute $4.5 million to Mercantile as dividends without prior regulatory approval. Our and the ability of our banks to pay cash and stock dividends is subject to limitations under various laws and regulations and to prudent and sound banking practices. On , our Board of Directors declared a cash dividend on our common stock in the amount of $0.37 per share that was paid on , to shareholders of record as of . On , our Board of Directors declared a cash dividend on our common stock in the amount of $0.37 per share that was paid on , to shareholders of record as of . On , our Board of Directors declared a cash dividend on our common stock in the amount of $0.38 per share that was paid on , to shareholders of record as of . On October 16, 2025, our Board of Directors declared a cash dividend on our common stock in the amount of $0.38 per share that was paid on December 17, 2025, to shareholders of record as of December 5, 2025.
As of December 31, 2025, we had the ability to repurchase up to $6.8 million in common stock shares from time to time in open market transactions at prevailing market prices or by other means in accordance with applicable regulations as part of a $20.0 million common stock repurchase program announced in May 2021. No shares were repurchased during 2025 or 2024. Historically, stock repurchases have been funded from cash dividends paid to us from Mercantile Bank. Additional repurchases may be made in future periods under the authorized plan or a new plan, which would also likely be funded from cash dividends paid to us from our banks. The actual timing, number and value of shares repurchased will be determined by us in our discretion and will depend on a number of factors, including the stock price, capital position, financial performance, general market and economic conditions, alternative uses of capital and applicable legal requirements.
Our consolidated capital levels as of December 31, 2025 and 2024 include $48.9 million and $48.3 million, respectively, of trust preferred securities. Under applicable Federal Reserve guidelines, the trust preferred securities constitute a restricted core capital element. The guidelines provide that the aggregate amount of restricted core capital elements that may be included in Tier 1 capital must not exceed 25% of the sum of all core capital elements, including restricted core capital elements, net of goodwill less any associated deferred tax liability. Our ability to include the trust preferred securities in Tier 1 capital in accordance with the guidelines is not affected by the provision of the Dodd-Frank Act generally restricting such treatment, because (i) the trust preferred securities were issued before May 19, 2010, and (ii) our total consolidated assets as of December 31, 2009 were less than $15.0 billion. At December 31, 2025 and 2024, all $48.9 million and $48.3 million, respectively, of the trust preferred securities were included as Tier 1 capital of Mercantile.
NOTE 19 - REGULATORY MATTERS (Continued)
Our actual capital levels and minimum required levels at year-end 2025 and 2024 were:
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Note 20 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements |
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| Notes to Financial Statements | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Condensed Financial Information of Parent Company Only Disclosure [Text Block] |
NOTE 20 – MERCANTILE BANK CORPORATION (PARENT COMPANY ONLY) CONDENSED FINANCIAL STATEMENTS
CONDENSED BALANCE SHEETS
CONDENSED STATEMENTS OF INCOME
NOTE 20 – MERCANTILE BANK CORPORATION (PARENT COMPANY ONLY) CONDENSED FINANCIAL STATEMENTS (Continued)
CONDENSED STATEMENTS OF CASH FLOWS
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Note 21 - Business Segment Information |
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| Notes to Financial Statements | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Disclosure [Text Block] |
NOTE 21 – BUSINESS SEGMENT INFORMATION
Pursuant to Financial Accounting Standards Codification
280,
Segment Reporting, operating segments represent components of an enterprise for which separate financial information is available that is regularly evaluated by the chief operating decision makers in determining how to allocate resources and assessing performance.
Prior to our acquisition of Eastern Michigan Financial Corporation on
December 31, 2025, our chief operating decision makers, which include our Chief Executive Officer, Chief Financial Officer, and Chief Operating Officer, evaluated interest and noninterest income streams and credit losses from our various products and services, while expense activities, including interest expense and noninterest expense, were managed, and financial performance was evaluated, on a Company-wide basis. As a result, detailed profitability information for each interest and noninterest income stream was
not used by our chief operating decision makers to allocate resources or in assessing performance. Rather, our chief operating decision makers used consolidated net income to assess performance by comparing it to and monitoring against budgeted and prior-year results. This information was used to manage resources to drive business and net income growth, including investment in key strategic priorities, as well as determine our ability to return capital to shareholders.
Subsequent to our acquisition of Eastern Michigan Financial Corporation on
December 31, 2025, our chief operating decision makers now evaluate interest and noninterest income streams, credit losses, expense activities, and financial performance through our
two wholly owned subsidiary banks, Mercantile Bank and Eastern Michigan Bank. Each of these operating segments offer similar products and services, but are managed separately due to different pricing, product demand, and consumer markets. Both segments derive interest and noninterest income through their banking products and services and investment securities. All of our income relates to our operations in the United States. Our chief operating decision makers use subsidiary level net income to assess performance by comparing it to and monitoring against budgeted and prior-year results. This information is used to manage resources to drive business and net income growth, including investment in key strategic priorities, as well as determine our ability to return capital to shareholders.
Segment net income represented net income on our Consolidated Statements of Income during and for the years ended
December 31, 2025,
2024 and
2023. Segment assets represented total assets and goodwill represented total goodwill on our Consolidated Balance Sheets as of
December 31, 2024. Goodwill, core deposit intangible, and total assets by segment as of
December 31, 2025 were as follows:
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Note 22 - Subsequent Events |
12 Months Ended |
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Dec. 31, 2025 | |
| Notes to Financial Statements | |
| Subsequent Events [Text Block] |
NOTE 22 – SUBSEQUENT EVENTS
On , our Board of Directors declared a cash dividend on our common stock in the amount of $0.39 per share that will be paid on , to shareholders of record as of . |
Significant Accounting Policies (Policies) |
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Consolidation, Policy [Policy Text Block] | Principles of Consolidation: The consolidated financial statements include the accounts of Mercantile Bank Corporation (“Mercantile”) and its subsidiaries, Mercantile Bank and Eastern Michigan Bank (collectively "our banks"), and Mercantile Community Partners LLC ("MCP"), and of Mercantile Insurance Center, Inc. (“our insurance company”), a subsidiary of Mercantile Bank, after elimination of significant intercompany transactions and accounts.
Mercantile has five separate business trusts: Mercantile Bank Capital Trust I, Firstbank Capital Trust I, Firstbank Capital Trust II, Firstbank Capital Trust III and Firstbank Capital Trust IV (“our trusts”). Our trusts were formed to issue trust preferred securities. We issued subordinated debentures to our trusts in return for the proceeds raised from the issuance of the trust preferred securities. Our trusts are not consolidated, but instead we report the subordinated debentures issued to the trusts as liabilities.
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| Nature of Operation [Policy Text Block] | Nature of Operations: Mercantile was incorporated on July 15, 1997, to establish and own Mercantile Bank based in Grand Rapids, Michigan. Mercantile Bank began operations on December 15, 1997. Mercantile Bank completed the merger of Firstbank Corporation, a Michigan corporation with approximately $1.5 billion in total assets and 46 branch locations, into Mercantile as of June 1, 2014. On December 31, 2025, Mercantile completed the merger of Eastern Michigan Financial Corporation, and its wholly owned banking subsidiary, Eastern Michigan Bank, with approximately $572 million in total assets and 11 branch locations. Mercantile will operate for a period of time as a two-bank holding company. The newly acquired Eastern Michigan Bank will operate alongside Mercantile Bank until the first quarter of 2027, at which time Mercantile plans to consolidate Eastern Michigan Bank into Mercantile Bank.
Mercantile is a financial holding company whose principal activity is the ownership and management of Mercantile Bank and Eastern Michigan Bank. Both Mercantile Bank and Eastern Michigan Bank are community-based financial institutions. Their primary deposit products are checking, saving, and term certificate accounts, and their primary lending products are commercial loans, residential mortgage loans, and instalment loans. Substantially all loans are secured by specific items of collateral, including business assets, real estate or consumer assets. Commercial loans are expected to be repaid from cash flow from operations of businesses. Real estate loans are secured by commercial or residential real estate. We have no material foreign loans or significant overdraft balances. Our banks' loan accounts and retail deposits are primarily with customers located in the communities in which we have bank office locations. As an alternative source of funds, our banks have also issued certificates of deposit to depositors outside of their primary market areas.
Our insurance company acquired an existing shelf insurance agency effective April 15, 2002. An Agency and Institution Agreement was entered into among our insurance company, Mercantile Bank and Hub International for the purpose of providing programs of mass marketed personal lines of insurance. Insurance product offerings include private passenger automobile, homeowners, personal inland marine, boat owners, recreational vehicle, dwelling fire, umbrella policies, small business and life insurance products, all of which are provided by and written through companies that have appointed Hub International as their agent. To date, we have not provided the insurance products noted above and currently have no plans to do so.
We have evaluated subsequent events for potential recognition and/or disclosure through the date these financial statements were issued.
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| Use of Estimates, Policy [Policy Text Block] | Use of Estimates: To prepare financial statements in conformity with accounting principles generally accepted in the United States of America, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. The allowance for credit losses and the fair value measurements are particularly subject to change.
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| Cash and Cash Equivalents, Policy [Policy Text Block] | Cash and Cash Equivalents and Cash Flow Reporting: Cash and cash equivalents include cash on hand, demand deposits with other financial institutions, short-term investments and federal funds sold. Cash flows are reported net for customer loan and deposit transactions, interest-earning deposits invested with other financial institutions and short-term borrowings with maturities of 90 days or less.
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| 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.
Changes in the allowance are recorded as provisions for (or reversals of) credit loss expense. Losses are charged against the allowance when the collectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. At December 31, 2025, there was allowance related to the available for sale debt securities portfolio.
Interest income includes amortization of purchase premiums and accretion of discounts. Premiums and discounts on securities are amortized or accreted on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method.
on available for sale debt securities totaling $5.5 million and $3.6 million at December 31, 2025 and 2024, respectively, was reported in other assets on the Consolidated Balance Sheets. Management has made the accounting policy election to exclude accrued interest receivable on available for sale securities from the estimate of credit losses as accrued interest is written off in a timely manner when deemed uncollectible.
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| 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 adjusted for partial charge-offs and the allowance, net of deferred loan fees and costs and purchase premiums and discounts. Interest income on loans is accrued over the term of the loans primarily using the simple interest method based on the principal balance outstanding. Accrued interest is included in other assets in the Consolidated Balance Sheets. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
The December 31, 2025, acquisition of Eastern Michigan Bank resulted in the recognition of $1.5 million of net purchased loan discounts. Purchased loan discounts were measured at the time of acquisition based upon the difference between the initial amortized cost basis and the par value of the loan. The premiums and discounts will be amortized into interest income over the life of the loans.
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 $1.3 million and $2.2 million at December 31, 2025 and 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. 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.
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| Commercial Loan Participations [Policy Text Block] | Commercial Loan Participations: As part of our credit risk administration practices and to manage exposure limits, we engage in commercial loan participations with other financial institutions from time-to-time. In all instances, the commercial loans are participated at par with no loan yield adjustments; therefore, no gain or loss on sale, or servicing right, is recorded. We retain a large portion of the loan exposure and continue to service the lending relationship. Commercial loan participations aggregated $71.8 million and $48.6 million as of December 31, 2025 and 2024, respectively.
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| 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. 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 and the carrying value of the related mortgage loan sold, which is reduced by the cost allocated to the servicing right.
Year-end mortgage loans held for sale were as follows:
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| Mortgage Loan Derivatives, Policy [Policy Text Block] | Mortgage Loan Derivatives: We enter into forward contracts and interest rate lock commitments in the ordinary course of business, which are accounted for as derivatives. The derivatives are not designated as hedges and are carried at fair value. The net gain or loss on derivatives is included in mortgage banking activities in the Consolidated Statements of Income. The net balance of mortgage loan derivatives aggregated to an asset of $0.3 million as of December 31, 2025, and an asset of $0.1 million as of December 31, 2024.
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| Mortgage Banking Activity [Policy Text Block] | Mortgage Banking Activities: Income derived from mortgage banking activities include the net gain on sale of mortgage loans, originated mortgage servicing rights, and servicing fee income net of mortgage servicing rights amortization expense. The net gain on sale of mortgage loans represents the premium received in excess of the unpaid principal balance plus net origination fees.
Originated mortgage loan servicing rights are recorded at fair value at the time of sale and amortized in proportion to, and over the period of, estimated net servicing revenues. At each period end, 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. We have identified four classes of mortgage servicing rights based on the initial term of the underlying mortgage loans: 10 years, 15 years, 20 years and 30 years. We distinguish between these classes based on the differing sensitivities to the change in value from changes in mortgage interest rates. Any impairment of a grouping is reported as a valuation allowance. Servicing fees are earned for servicing mortgage loans and are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned.
Interest rate risk, prepayment risk and default risk are inherent in mortgage servicing rights valuations. Interest rate changes largely drive prepayment rates. Refinance activity generally increases as interest rates decline. A significant decrease in interest rates beyond expectation could cause a decline in the value of mortgage servicing rights. On the contrary, borrowers are less likely to refinance or prepay their mortgage loans if interest rates increase, which would extend the duration of the underlying mortgage loans and the associated mortgage servicing rights value would likely rise. Because of these risks, discount rates and prepayment speeds are used to estimate the fair value of mortgage servicing rights.
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| Credit Loss, Financial Instrument [Policy Text Block] | Allowance for Credit Losses (“allowance”): 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 provision expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. Loans are charged-off against the allowance when we believe the uncollectibility 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 characteristics that 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 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:
The estimation of future credit losses should reflect consideration of all significant factors that affect the collectibility 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. Effective January 1, 2022, we established a historical loss information factor to address the relatively low level of loan losses during the look-back period.
Purchased loans are recorded at fair value at the time of acquisition and distinguished between purchased seasoned loans ("PSL"), purchased credit deteriorated loans ("PCD loans"), and non-seasoned new acquisitions. PSL are loans purchased at least 90 days after its original origination date and without significant credit deterioration. PCD loans are acquired loans that have experienced a more-than-insignificant decline in credit quality since their origination. We considered all loans that were currently 60 days or more past due, ever on nonaccrual status, had ever been past due three or more times, consumer loans with borrower credit scores below 600, or commercial loans rated monitor, special mention, substandard or doubtful to be PCD loans. There were no non-seasoned new acquisition loans during 2025, 2024 and 2023.
PSL and PCD loans are accounted for using the gross-up approach prescribed in Accounting Standards Codification 326, Financial Instruments - Credit Losses. The gross-up approach requires recognition of an allowance for the estimate of credit losses at the acquisition date. The allowance is recorded with an offsetting gross-up adjustment to the purchase price of the acquired financial asset.
Accrued interest receivable on loans totaling $17.5 million and $17.3 million as of December 31, 2025 and 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 the loan becomes 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 uncollectible 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 that 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 that 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 its 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 Statement 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.
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| Transfers and Servicing of Financial Assets, Policy [Policy Text Block] | Transfers of Financial Assets: Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when: (1) the assets have been isolated from our banks and put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) our banks do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Our transfers of financial assets are generally limited to commercial loan participations sold and residential mortgage loans sold in the secondary market.
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| Property, Plant and Equipment, Policy [Policy Text Block] | Premises and Equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Buildings and related components are depreciated using the straight-line method with useful lives ranging from 5 to 33 years. Furniture, fixtures and equipment are depreciated using the straight-line method with useful lives ranging from 3 to 7 years. Maintenance, repairs and minor alterations are charged to current operations as expenditures occur and major improvements are capitalized. Premises and equipment are reviewed for impairment when events indicate their carrying amount may not be recoverable based on future undiscounted cash flows. If impaired, the assets are recorded at the lower of carrying value or fair value.
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| Financing Receivable, Held-for-Investment, Foreclosed Asset [Policy Text Block] | Foreclosed Assets: Assets acquired through or in lieu of foreclosure are initially recorded at their estimated fair value net of estimated selling costs, establishing a new cost basis. If fair value subsequently declines, a valuation allowance is recorded through noninterest expense, as are collection and operating costs after acquisition. We had no foreclosed assets as of December 31, 2025 and 2024.
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| Bank Owned Life Insurance, Policy [Policy Text Block] | Bank Owned Life Insurance: Our banks have purchased life insurance policies on certain key officers. Bank owned life insurance is recorded at its cash surrender value, or the amount that can be realized. Increases in the net cash surrender value of the policies, as well as insurance proceeds received, are recorded as noninterest income on the Consolidated Statements of Income and are not subject to income taxes.
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| 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 to 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 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, it was determined that the fair value was in excess of its respective carrying value as of October 1, 2025; therefore, goodwill was considered not impaired. Subsequent to the analysis of goodwill, on December 31, 2025, we acquired Eastern Michigan Financial Corporation, resulting in the recognition of $23.2 million of goodwill. Goodwill recognized from the acquisition of Eastern Michigan Financial Corporation is further discussed in Note 17 - Business Combinations.
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| Repurchase and Resale Agreements Policy [Policy Text Block] | Repurchase Agreements: Our banks sell certain securities under agreements to repurchase. The agreements are treated as collateralized financing transactions, with the obligations to repurchase the securities sold reflected as liabilities and the securities underlying the agreements remaining in assets in the Consolidated Balance Sheets.
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| Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] | Financial Instruments and Loan Commitments: Financial instruments include off-balance-sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Instruments, such as standby letters of credit, that are considered financial guarantees are recorded at fair value. Reserves for unfunded commitments are recorded as an other liability on our Consolidated Balance Sheets.
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| Share-Based Payment Arrangement [Policy Text Block] | Stock-Based Compensation: Compensation cost for equity-based awards is measured on the grant date based on the fair value of the award on that date and recognized over the requisite service period, net of estimated forfeitures. Fair value of stock option awards is estimated using a closed option valuation (Black-Scholes) model. Fair value of restricted stock awards is based upon the quoted market price of the common stock on the date of grant.
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| 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 for the years ended December 31, 2025, 2024 and 2023 that are scoped within Topic 606:
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 Fees: 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.
Payroll Processing Fees: 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 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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| Advertising Cost [Policy Text Block] | Advertising Costs: Advertising costs are expensed as incurred.
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| Income Tax, Policy [Policy Text Block] | Income Taxes: Income tax expense is the total of the current year income tax due or refundable, the change in deferred income tax assets and liabilities, and any adjustments related to unrecognized tax benefits. Deferred income tax assets and liabilities are recognized for the tax consequences of temporary differences between the carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates applicable to future years. A valuation allowance, if needed, reduces deferred income tax assets to the amount expected to be realized.
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| Fair Value of Financial Instruments, Policy [Policy Text Block] | Fair Values of Financial Instruments: Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates. The fair value estimates of existing on- and off-balance sheet financial instruments do not include the value of anticipated future business or the values of assets and liabilities not considered financial instruments.
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| 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 using the treasury stock method. Our unvested stock awards, which contain non-forfeitable rights to dividends whether paid or unpaid (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 stock awards are excluded from the calculations of both basic and diluted earnings per share. There were no dilutive shares outstanding during the years ended December 31, 2025, 2024 and 2023. Weighted average common shares outstanding were 16,237,974, 16,130,696, and 16,015,678 during the years ended December 31, 2025, 2024 and 2023.
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| Comprehensive Income, Policy [Policy Text Block] | Comprehensive Income (Loss): Comprehensive income (loss) consists of net income and other comprehensive income (loss). Accumulated other comprehensive gain/(loss) includes unrealized gains and losses on securities available for sale. Accumulated other comprehensive gain/(loss) was comprised of the following as of December 31, 2025, 2024 and 2023:
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| 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 historically 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. 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 December 31, 2025 and 2024.
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| Commitments and Contingencies, Policy [Policy Text Block] | Contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. We do not believe there are any such matters outstanding that would have a material effect on the financial statements.
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| New Accounting Pronouncements, Policy [Policy Text Block] | Recent Accounting Changes Adopted: Accounting Standards Updated No. 2025-08, Financial Instruments - Credit Losses (Topic 326): Purchased Loans. This update expands the population of acquired financial instruments subject to the gross-up approach in Topic 326. In accordance with the amendments in this update, loans (excluding credit cards) acquired without credit deterioration and deemed "seasoned" are purchased seasoned loans and accounted for using the gross-up approach at acquisition. This update takes effect for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods with adoption being applied prospectively to loans that are acquired on or after the initial application date. We have adopted the standard and included the required disclosures in our financial statements.
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Note 1 - Summary of Significant Accounting Policies (Tables) |
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| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
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Note 2 - Securities (Tables) |
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Note 3 - Loans and Allowance for Credit Losses (Tables) |
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Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|
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| Concentrations Within Loan Portfolio [Table Text Block] |
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| Financing Receivable, Past Due [Table Text Block] |
|
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| Financing Receivable, Nonaccrual [Table Text Block] |
|
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| Financing Receivable Credit Quality Indicators [Table Text Block] |
|
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| Financing Receivable by Origination Year [Table Text Block] |
|
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| Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|
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| Financing Receivable, Modified, Financial Effect [Table Text Block] |
|
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| Financing Receivable, Modified, Amortized Cost [Table Text Block] |
|
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| Retail Portfolio Segment [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivable Credit Quality Indicators [Table Text Block] |
|
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Note 4 - Premises and Equipment, Net (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, Plant and Equipment [Table Text Block] |
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| Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] |
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Note 5 - Mortgage Loan Servicing (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mortgage Loans Serviced for Others [Table Text Block] |
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| Servicing Asset at Amortized Cost [Table Text Block] |
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Note 6 - Deposits (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Deposits and Percentage Change in Deposits [Table Text Block] |
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| Contractual Maturities of Certificates of Deposits [Table Text Block] |
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Note 7 - Securities Sold Under Agreements to Repurchase (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Repurchase Agreements [Table Text Block] |
|
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Note 8 - Other Borrowings (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||
| Amortizing Advances [Member] | ||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||
| Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
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| Bullet Advances [member] | ||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||
| Maturities of Currently Outstanding FHLB Advances [Table Text Block] |
|
Note 9 - Federal Income Taxes (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
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| Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
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| Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
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Note 10 - Stock-based Compensation (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
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| Corporate and Bank Board Members [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|
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Note 11 - Related Parties (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Related Party Transactions [Table Text Block] |
|
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Note 12 - Commitments and Off-balance-sheet Risk (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Contractual Amounts of Financial Instruments With Off Balance Sheet Risk [Table Text Block] |
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| Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] |
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Note 14 - Derivatives and Hedging Activities (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Derivative Instruments [Table Text Block] |
|
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| Offsetting Assets and Liabilities [Table Text Block] |
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Note 15 - Fair Values of Financial Instruments (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value, by Balance Sheet Grouping [Table Text Block] |
|
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Note 16 - Fair Value Measurements (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|
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| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] |
|
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Note 17 - Business Combinations (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] |
|
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| Business Combination, Pro Forma Information [Table Text Block] |
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Note 18 - Variable Interest Entities (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Subordinated Borrowing [Table Text Block] |
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| Schedule of Variable Interest Entities [Table Text Block] |
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| Investment Program, Proportional Amortization Method, Elected [Table Text Block] |
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Note 19 - Regulatory Matters (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|
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Note 20 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Condensed Balance Sheet [Table Text Block] |
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| Condensed Income Statement [Table Text Block] |
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| Condensed Cash Flow Statement [Table Text Block] |
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Note 21 - Business Segment Information (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2025
USD ($)
shares
|
Dec. 31, 2024
USD ($)
shares
|
Dec. 31, 2023
shares
|
Jun. 01, 2014
USD ($)
|
|
| Number of Unconsolidated Business Trusts Formed to Issue Trust Preferred Securities | 5 | 5 | |||
| Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance | $ 0 | $ 0 | |||
| Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 5,500 | 5,500 | $ 3,600 | ||
| Financing Receivable, Unamortized Loan Cost (Fee) | 1,300 | $ 1,300 | 2,200 | ||
| Interest Income on Commercial and Mortgage Loans Discontinued Period (Day) | 90 days | ||||
| Maximum Delinquency Period for Consumer and Credit Card Loans to be Charged Off (Day) | 120 days | ||||
| Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 17,500 | $ 17,500 | $ 17,300 | ||
| Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights (in shares) | shares | 0 | 0 | 0 | ||
| Weighted Average Number of Shares Outstanding, Basic (in shares) | shares | 16,237,974 | 16,130,696 | 16,015,678 | ||
| Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets | |||
| Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets | |||
| Not Designated as Hedging Instrument [Member] | Mortgage Loan Derivative [Member] | |||||
| Derivative Asset | $ 300 | $ 300 | $ 100 | ||
| Commercial Loan [Member] | |||||
| Loan Participation, Amount | 71,800 | 71,800 | $ 48,600 | ||
| Firstbank Corporation [Member] | |||||
| Business Combination, Recognized Asset Acquired, Asset | $ 1,500,000 | ||||
| Business Combination Branches Acquired | 46 | ||||
| Eastern Michigan Financial Corp. [Member] | |||||
| Business Combination, Recognized Asset Acquired, Asset | $ 548,593 | $ 548,593 | |||
| Business Combination Branches Acquired | 11 | 11 | |||
| Business Combination, Recognized Asset Acquired, Asset Including Goodwill | $ 572,000 | $ 572,000 | |||
| Business Combination, Recognized Asset Acquired, Financing Receivable, Unamortized Purchase Premium (Discount) | (1,500) | $ (1,500) | |||
| Goodwill, Acquired During Period | $ 23,200 | ||||
Note 1 - Summary of Significant Accounting Policies - Year-end Mortgage Loans Held for Sale (Details) - Mortgage Loans [Member] - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Mortgage loans held for sale | $ 17,160 | $ 15,824 |
| Less: Allowance to adjust to lower of cost or market | 0 | 0 |
| Mortgage loans held for sale, net | $ 17,160 | $ 15,824 |
Note 1 - Summary of Significant Accounting Policies - Noninterest Income (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Credit and Debit Card [Member] | |||
| Noninterest revenue | $ 9,207 | $ 8,821 | $ 8,914 |
| Service Charges on Deposit and Sweep Accounts [Member] | |||
| Noninterest revenue | 8,134 | 6,842 | 4,954 |
| Payroll Processing [Member] | |||
| Noninterest revenue | 3,473 | 3,058 | 2,509 |
| Customer Service [Member] | |||
| Noninterest revenue | $ 876 | $ 797 | $ 801 |
Note 1 - Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Accumulated other comprehensive gain/(loss) | $ (23,995) | $ (49,825) | $ (50,487) |
| AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] | |||
| Unrealized gains (losses) on securities available for sale | (30,373) | (63,070) | (63,906) |
| Tax effect | $ 6,378 | $ 13,245 | $ 13,419 |
Note 2 - Securities (Details Textual) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
Dec. 31, 2023
USD ($)
|
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 607 | 843 | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 545,301 | $ 680,417 | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 36,856 | 63,807 | |
| Proceeds from Sale of Debt Securities, Available-for-Sale | 0 | 0 | $ 0 |
| Debt Securities, Available-for-Sale, Amortized Cost | 1,132,603 | 793,422 | |
| Debt Securities, Available-for-Sale | 1,102,230 | 730,352 | |
| Bonds Issued or Guaranteed by Agencies of the U.S. Federal Government [Member] | |||
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 31,100 | ||
| Bonds Issued by State-based Municipalities [Member] | |||
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 5,700 | ||
| State of Michigan and All Its Political Subdivisions [Member] | |||
| Debt Securities, Available-for-Sale, Amortized Cost | 252,000 | 219,000 | |
| Debt Securities, Available-for-Sale | 249,000 | 209,000 | |
| All Other States and Their Political Subdivisions [Member] | |||
| Debt Securities, Available-for-Sale, Amortized Cost | 31,300 | 0 | |
| Debt Securities, Available-for-Sale | 31,300 | 0 | |
| US Government Agency Debt Obligations and Mortgage Backed Securities [Member] | |||
| Debt Securities, Available-for-Sale, Restricted | 232,000 | 122,000 | |
| US Government Agencies Debt Securities [Member] | |||
| Debt Securities, Available-for-Sale, Unrealized Loss Position | 392,306 | 475,113 | |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | 26,411 | 47,226 | |
| Debt Securities, Available-for-Sale, Amortized Cost | 661,841 | 542,676 | |
| Debt Securities, Available-for-Sale | 639,773 | 495,581 | |
| Debt Securities, Available-for-Sale, Restricted | $ 12,600 | $ 11,700 | |
Note 2 - Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Total, amortized cost | $ 1,132,603 | $ 793,422 |
| Securities available for sale, gross unrealized gains | 6,483 | 737 |
| Securities available for sale, gross unrealized losses | (36,856) | (63,807) |
| Fair value | 1,102,230 | 730,352 |
| US Treasury Securities [Member] | ||
| Total, amortized cost | 55,501 | |
| Securities available for sale, gross unrealized gains | 0 | |
| Securities available for sale, gross unrealized losses | 0 | |
| Fair value | 55,501 | |
| US Government Agencies Debt Securities [Member] | ||
| Total, amortized cost | 661,841 | 542,676 |
| Securities available for sale, gross unrealized gains | 4,343 | 131 |
| Securities available for sale, gross unrealized losses | (26,411) | (47,226) |
| Fair value | 639,773 | 495,581 |
| Collateralized Mortgage-Backed Securities [Member] | ||
| Total, amortized cost | 80,475 | 31,696 |
| Securities available for sale, gross unrealized gains | 14 | 4 |
| Securities available for sale, gross unrealized losses | (4,727) | (6,332) |
| Fair value | 75,762 | 25,368 |
| Municipal General Obligation Bonds [Member] | ||
| Total, amortized cost | 217,283 | 187,484 |
| Securities available for sale, gross unrealized gains | 1,946 | 513 |
| Securities available for sale, gross unrealized losses | (4,166) | (7,827) |
| Fair value | 215,063 | 180,170 |
| Municipal Revenue Bonds [Member] | ||
| Total, amortized cost | 66,376 | 31,066 |
| Securities available for sale, gross unrealized gains | 180 | 89 |
| Securities available for sale, gross unrealized losses | (1,552) | (2,422) |
| Fair value | 65,004 | 28,733 |
| Other Debt and Equity Securities [Member] | ||
| Total, amortized cost | 51,127 | 500 |
| Securities available for sale, gross unrealized gains | 0 | 0 |
| Securities available for sale, gross unrealized losses | 0 | 0 |
| Fair value | $ 51,127 | $ 500 |
Note 2 - Securities - Securities in a Continuous Loss Position (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Securities available for sale, continuous unrealized loss position, less than 12 months | $ 48,801 | $ 180,363 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 270 | 3,525 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 496,500 | 500,054 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 36,586 | 60,282 |
| Securities available for sale, continuous unrealized loss position | 545,301 | 680,417 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 36,856 | 63,807 |
| US Treasury Securities [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 0 | |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 0 | |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 0 | |
| Securities available for sale, continuous unrealized loss position | 0 | |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 0 | |
| US Government Agencies Debt Securities [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 41,380 | 113,942 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 234 | 2,379 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 350,926 | 361,171 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 26,177 | 44,847 |
| Securities available for sale, continuous unrealized loss position | 392,306 | 475,113 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 26,411 | 47,226 |
| Collateralized Mortgage-Backed Securities [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 0 | 194 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | 1 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 22,945 | 24,865 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 4,727 | 6,331 |
| Securities available for sale, continuous unrealized loss position | 22,945 | 25,059 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 4,727 | 6,332 |
| Municipal General Obligation Bonds [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 4,465 | 63,387 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 23 | 1,117 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 102,736 | 92,153 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 4,143 | 6,710 |
| Securities available for sale, continuous unrealized loss position | 107,201 | 155,540 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 4,166 | 7,827 |
| Municipal Revenue Bonds [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 2,956 | 2,840 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 13 | 28 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 19,893 | 21,865 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 1,539 | 2,394 |
| Securities available for sale, continuous unrealized loss position | 22,849 | 24,705 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | 1,552 | 2,422 |
| Other Debt and Equity Securities [Member] | ||
| Securities available for sale, continuous unrealized loss position, less than 12 months | 0 | 0 |
| Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss | 0 | 0 |
| Securities available for sale, continuous unrealized loss position, 12 months or more | 0 | 0 |
| Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss | 0 | 0 |
| Securities available for sale, continuous unrealized loss position | 0 | 0 |
| Securities available for sale, continuous unrealized loss position, unrealized loss | $ 0 | $ 0 |
Note 2 - Securities - Debt Securities by Maturity (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Due in one year or less, amortized cost | $ 85,205 | |
| Due in one year or less, fair value | 84,389 | |
| Due from one to five years, amortized cost | 529,700 | |
| Due from one to five years, fair value | 516,624 | |
| Due from five to ten years, amortized cost | 316,053 | |
| Due from five to ten years, fair value | 303,308 | |
| Due after ten years, amortized cost | 70,043 | |
| Due after ten years, fair value | 71,020 | |
| Total, amortized cost | 1,132,603 | $ 793,422 |
| Fair value | 1,102,230 | 730,352 |
| Collateralized Mortgage-Backed Securities [Member] | ||
| No single maturity, amortized cost | 80,475 | |
| No single maturity, fair value | 75,762 | |
| Total, amortized cost | 80,475 | 31,696 |
| Fair value | 75,762 | 25,368 |
| Other Debt and Equity Securities [Member] | ||
| No single maturity, amortized cost | 51,127 | |
| No single maturity, fair value | 51,127 | |
| Total, amortized cost | 51,127 | 500 |
| Fair value | $ 51,127 | $ 500 |
Note 3 - Loans and Allowance for Credit Losses (Details Textual) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Financing Receivable, Nonaccrual, Interest Income | $ 1.0 | $ 0.3 | $ 0.2 |
| Financing Receivable, Revolving, Converted to Term Loan During Period | 0.7 | 9.1 | |
| Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) From Forecast Changes | (0.3) | (2.2) | |
| Financing Receivable, Individually Evaluated for Credit Loss | 7.9 | 7.4 | |
| Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 4.0 | $ 2.2 | |
| Commercial Portfolio Segment [Member] | |||
| Financing Receivables, Prepayment Speed Assumed | 2.00% | 2.00% | |
| Retail Portfolio Segment [Member] | |||
| Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | $ (2.3) | ||
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | |||
| Financing Receivables, Prepayment Speed Assumed | 9.50% | 7.80% | |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | |||
| Financing Receivables, Prepayment Speed Assumed | 9.50% | 7.80% | |
Note 3 - Loans and Allowance for Credit Losses - Components of Loan Portfolio (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Loans | $ 4,821,888 | $ 4,600,781 |
| Percent of portfolio | 100.00% | 100.00% |
| Period increase (decrease) | 4.80% | |
| Commercial Portfolio Segment [Member] | ||
| Loans | $ 3,918,662 | $ 3,707,304 |
| Percent of portfolio | 81.30% | 80.60% |
| Period increase (decrease) | 5.70% | |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | $ 1,374,522 | $ 1,287,308 |
| Percent of portfolio | 28.50% | 28.00% |
| Period increase (decrease) | 6.80% | |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | $ 117,373 | $ 66,936 |
| Percent of portfolio | 2.40% | 1.50% |
| Period increase (decrease) | 75.40% | |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | $ 778,869 | $ 748,837 |
| Percent of portfolio | 16.20% | 16.30% |
| Period increase (decrease) | 4.00% | |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | $ 1,110,674 | $ 1,128,404 |
| Percent of portfolio | 23.00% | 24.50% |
| Period increase (decrease) | (1.60%) | |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | $ 537,224 | $ 475,819 |
| Percent of portfolio | 11.20% | 10.30% |
| Period increase (decrease) | 12.90% | |
| Retail Portfolio Segment [Member] | ||
| Loans | $ 903,226 | $ 893,477 |
| Percent of portfolio | 18.70% | 19.40% |
| Period increase (decrease) | 1.10% | |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | $ 790,857 | $ 827,597 |
| Percent of portfolio | 16.40% | 18.00% |
| Period increase (decrease) | (4.40%) | |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | $ 112,369 | $ 65,880 |
| Percent of portfolio | 2.30% | 1.40% |
| Period increase (decrease) | 70.60% |
Note 3 - Loans and Allowance for Loan Losses - Concentrations Within the Loan Portfolio (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans | $ 4,821,888 | $ 4,600,781 |
| Commercial Real Estate Loans to Lessors of Non Residential Buildings [Member] | ||
| Loans | $ 759,127 | $ 822,402 |
| Percent of portfolio | 15.70% | 17.90% |
Note 3 - Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans | $ 4,821,888 | $ 4,600,781 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | ||
| Loans | 3,918,662 | 3,707,304 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 1,374,522 | 1,287,308 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 117,373 | 66,936 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 778,869 | 748,837 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 1,110,674 | 1,128,404 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 537,224 | 475,819 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Retail Portfolio Segment [Member] | ||
| Loans | 903,226 | 893,477 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 790,857 | 827,597 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 112,369 | 65,880 |
| Recorded Balance 89 Days and Accruing | 0 | 0 |
| Financial Asset, 30 to 59 Days Past Due [Member] | ||
| Loans | 2,157 | 2,494 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | ||
| Loans | 580 | 17 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 294 | 5 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 67 | 12 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 219 | 0 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | ||
| Loans | 1,577 | 2,477 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 992 | 2,365 |
| Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 585 | 112 |
| Financial Asset, 60 to 89 Days Past Due [Member] | ||
| Loans | 449 | 713 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | ||
| Loans | 449 | 713 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 409 | 713 |
| Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 40 | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | ||
| Loans | 2,922 | 1,046 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | ||
| Loans | 2,761 | 864 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 0 | 864 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 29 | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 2,732 | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | ||
| Loans | 161 | 182 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 156 | 182 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 5 | 0 |
| Financial Asset, Past Due [Member] | ||
| Loans | 5,528 | 4,253 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | ||
| Loans | 3,341 | 881 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 294 | 869 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 67 | 12 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 248 | 0 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 2,732 | 0 |
| Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 0 | 0 |
| Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member] | ||
| Loans | 2,187 | 3,372 |
| Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 1,557 | 3,260 |
| Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 630 | 112 |
| Financial Asset, Not Past Due [Member] | ||
| Loans | 4,816,360 | 4,596,528 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | ||
| Loans | 3,915,321 | 3,706,423 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 1,374,228 | 1,286,439 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 117,306 | 66,924 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 778,621 | 748,837 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 1,107,942 | 1,128,404 |
| Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 537,224 | 475,819 |
| Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member] | ||
| Loans | 901,039 | 890,105 |
| Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 789,300 | 824,337 |
| Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | $ 111,739 | $ 65,768 |
Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| With no related allowance recorded, principal balance | $ 2,861 | $ 1,824 | $ 2,342 |
| With related allowance recorded, principal balance | 5,009 | 3,918 | 1,073 |
| Related allowance | 4,019 | 2,134 | 241 |
| Total principal balance | 7,870 | 5,742 | 3,415 |
| Commercial Portfolio Segment [Member] | |||
| With no related allowance recorded, principal balance | 888 | 657 | 70 |
| With related allowance recorded, principal balance | 3,955 | 2,110 | 249 |
| Related allowance | 3,795 | 1,732 | 1 |
| Total principal balance | 4,843 | 2,767 | 319 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | |||
| With no related allowance recorded, principal balance | 170 | 615 | 0 |
| With related allowance recorded, principal balance | 1,223 | 2,110 | 249 |
| Related allowance | 1,063 | 1,732 | 1 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | |||
| With no related allowance recorded, principal balance | 201 | 0 | 0 |
| With related allowance recorded, principal balance | 0 | 0 | 0 |
| Related allowance | 0 | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | |||
| With no related allowance recorded, principal balance | 517 | 42 | 70 |
| With related allowance recorded, principal balance | 0 | 0 | 0 |
| Related allowance | 0 | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | |||
| With no related allowance recorded, principal balance | 0 | 0 | 0 |
| With related allowance recorded, principal balance | 2,732 | 0 | 0 |
| Related allowance | 2,732 | 0 | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | |||
| With no related allowance recorded, principal balance | 0 | 0 | 0 |
| With related allowance recorded, principal balance | 0 | 0 | 0 |
| Related allowance | 0 | 0 | 0 |
| Retail Portfolio Segment [Member] | |||
| With no related allowance recorded, principal balance | 1,973 | 1,167 | 2,272 |
| With related allowance recorded, principal balance | 1,054 | 1,808 | 824 |
| Related allowance | 224 | 402 | 240 |
| Total principal balance | 3,027 | 2,975 | 3,096 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | |||
| With no related allowance recorded, principal balance | 1,892 | 1,167 | 2,272 |
| With related allowance recorded, principal balance | 1,054 | 1,808 | 824 |
| Related allowance | 224 | 402 | 240 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | |||
| With no related allowance recorded, principal balance | 81 | 0 | 0 |
| With related allowance recorded, principal balance | 0 | 0 | 0 |
| Related allowance | $ 0 | $ 0 | $ 0 |
Note 3 - Loans and Allowance for Credit Losses - Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans | $ 4,821,888 | $ 4,600,781 |
| Commercial Portfolio Segment [Member] | ||
| Loans | 3,918,662 | 3,707,304 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 1,374,522 | 1,287,308 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 117,373 | 66,936 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 778,869 | 748,837 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 1,110,674 | 1,128,404 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 537,224 | 475,819 |
| Grades 1-4 [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 655,390 | 629,851 |
| Grades 1-4 [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 55,915 | 25,191 |
| Grades 1-4 [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 493,696 | 466,400 |
| Grades 1-4 [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 434,725 | 432,244 |
| Grades 1-4 [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 151,521 | 173,109 |
| Grades 5-7 [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 704,704 | 637,183 |
| Grades 5-7 [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 61,257 | 41,740 |
| Grades 5-7 [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 277,700 | 275,506 |
| Grades 5-7 [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 673,217 | 688,178 |
| Grades 5-7 [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | 385,703 | 302,100 |
| Grades 8-9 [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Loans | 14,428 | 20,274 |
| Grades 8-9 [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Loans | 201 | 5 |
| Grades 8-9 [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Loans | 7,473 | 6,931 |
| Grades 8-9 [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Loans | 2,732 | 7,982 |
| Grades 8-9 [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Loans | $ 0 | $ 610 |
Note 3 - Loans and Allowance for Credit Losses - Retail Credit Exposure (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Loans | $ 4,821,888 | $ 4,600,781 |
| Retail Portfolio Segment [Member] | ||
| Loans | 903,226 | 893,477 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 790,857 | 827,597 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Loans | 112,369 | 65,880 |
| Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 787,911 | 824,622 |
| Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Other Consumer Loans [Member] | ||
| Loans | 112,288 | 65,880 |
| Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | One to Four Family Mortgages [Member] | ||
| Loans | 2,946 | 2,975 |
| Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Consumer Loans [Member] | ||
| Loans | $ 81 | $ 0 |
Note 3 - Loans and Allowance for Credit Losses - Loan Vintage (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,021,237 | $ 1,098,837 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 766,170 | 964,475 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 690,567 | 740,508 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 644,373 | 615,667 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 490,990 | 342,667 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 302,823 | 99,001 | |
| Financing Receivable, Term Loan | 3,916,160 | 3,861,155 | |
| Financing Receivable, Revolving | 905,728 | 739,626 | |
| Loans | 4,821,888 | 4,600,781 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 20 | 10 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 13 | 1 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 2,975 | 19 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 22 | 41 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 61 | 3,741 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 3 | 5 | |
| Financing receivable, term loan write offs | 3,094 | 3,817 | |
| Financing Receivable, Revolving, Writeoff | 21 | 20 | |
| Current-period gross write-offs | 3,115 | 3,837 | $ 863 |
| Commercial Portfolio Segment [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 952,600 | 1,020,625 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 705,084 | 838,660 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 581,037 | 430,293 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 359,881 | 411,444 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 308,122 | 269,254 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 193,638 | 51,237 | |
| Financing Receivable, Term Loan | 3,100,362 | 3,021,513 | |
| Financing Receivable, Revolving | 818,300 | 685,791 | |
| Loans | 3,918,662 | 3,707,304 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 4 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 2,884 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 3,741 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 2,888 | 3,741 | |
| Financing Receivable, Revolving, Writeoff | 7 | 9 | |
| Current-period gross write-offs | 2,895 | 3,750 | |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 227,990 | 295,978 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 182,842 | 157,408 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 85,240 | 76,800 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 35,691 | 61,309 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 40,819 | 12,918 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 18,297 | 10,431 | |
| Financing Receivable, Term Loan | 590,879 | 614,844 | |
| Financing Receivable, Revolving | 783,643 | 672,464 | |
| Loans | 1,374,522 | 1,287,308 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 4 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 84 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 3,741 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 88 | 3,741 | |
| Financing Receivable, Revolving, Writeoff | 7 | 9 | |
| Current-period gross write-offs | 95 | 3,750 | 218 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Grades 1-4 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 82,163 | 102,898 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 57,225 | 68,536 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 38,063 | 41,609 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 12,554 | 47,534 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 35,423 | 9,551 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 14,878 | 8,412 | |
| Financing Receivable, Term Loan | 240,306 | 278,540 | |
| Financing Receivable, Revolving | 415,084 | 351,311 | |
| Loans | 655,390 | 629,851 | |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Grades 5-7 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 143,638 | 188,267 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 125,617 | 88,471 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 46,445 | 31,755 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 23,137 | 13,513 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 5,396 | 3,298 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,092 | 2,019 | |
| Financing Receivable, Term Loan | 347,325 | 327,323 | |
| Financing Receivable, Revolving | 357,379 | 309,860 | |
| Loans | 704,704 | 637,183 | |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Grades 8-9 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 2,189 | 4,813 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 401 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 732 | 3,436 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 262 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 69 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 327 | 0 | |
| Financing Receivable, Term Loan | 3,248 | 8,981 | |
| Financing Receivable, Revolving | 11,180 | 11,293 | |
| Loans | 14,428 | 20,274 | |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 59,294 | 50,228 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 18,130 | 12,683 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 3,338 | 2,465 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 9,971 | 694 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 3,131 | 177 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 12,495 | 689 | |
| Financing Receivable, Term Loan | 106,359 | 66,936 | |
| Financing Receivable, Revolving | 11,014 | 0 | |
| Loans | 117,373 | 66,936 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 0 | 0 | |
| Financing Receivable, Revolving, Writeoff | 0 | 0 | |
| Current-period gross write-offs | 0 | 0 | (0) |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Grades 1-4 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 22,242 | 18,536 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4,849 | 4,997 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,703 | 610 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 7,676 | 645 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,410 | 177 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 6,752 | 226 | |
| Financing Receivable, Term Loan | 45,632 | 25,191 | |
| Financing Receivable, Revolving | 10,283 | 0 | |
| Loans | 55,915 | 25,191 | |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Grades 5-7 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 37,052 | 31,692 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 13,281 | 7,681 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,635 | 1,855 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,295 | 49 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 520 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 5,743 | 463 | |
| Financing Receivable, Term Loan | 60,526 | 41,740 | |
| Financing Receivable, Revolving | 731 | 0 | |
| Loans | 61,257 | 41,740 | |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Grades 8-9 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 5 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 201 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Term Loan | 201 | 5 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 201 | 5 | |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 217,153 | 288,793 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 197,546 | 146,639 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 106,410 | 147,050 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 133,322 | 97,535 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 86,783 | 46,450 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 28,684 | 9,080 | |
| Financing Receivable, Term Loan | 769,898 | 735,547 | |
| Financing Receivable, Revolving | 8,971 | 13,290 | |
| Loans | 778,869 | 748,837 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 0 | 0 | |
| Financing Receivable, Revolving, Writeoff | 0 | 0 | |
| Current-period gross write-offs | 0 | 0 | 54 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Grades 1-4 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 135,403 | 179,763 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 137,672 | 84,641 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 51,266 | 88,794 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 77,169 | 75,702 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 66,198 | 34,031 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 18,302 | 3,469 | |
| Financing Receivable, Term Loan | 486,010 | 466,400 | |
| Financing Receivable, Revolving | 7,686 | 0 | |
| Loans | 493,696 | 466,400 | |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Grades 5-7 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 81,750 | 108,316 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 59,874 | 61,998 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 51,642 | 52,072 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 53,479 | 21,833 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 20,585 | 12,386 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 9,085 | 5,611 | |
| Financing Receivable, Term Loan | 276,415 | 262,216 | |
| Financing Receivable, Revolving | 1,285 | 13,290 | |
| Loans | 277,700 | 275,506 | |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Grades 8-9 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 714 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 3,502 | 6,184 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,674 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 33 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,297 | 0 | |
| Financing Receivable, Term Loan | 7,473 | 6,931 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 7,473 | 6,931 | |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 242,196 | 287,389 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 237,178 | 300,592 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 225,518 | 161,365 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 143,489 | 184,603 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 143,062 | 170,183 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 104,559 | 24,272 | |
| Financing Receivable, Term Loan | 1,096,002 | 1,128,404 | |
| Financing Receivable, Revolving | 14,672 | 0 | |
| Loans | 1,110,674 | 1,128,404 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 2,800 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 2,800 | 0 | |
| Financing Receivable, Revolving, Writeoff | 0 | 0 | |
| Current-period gross write-offs | 2,800 | 0 | (0) |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Grades 1-4 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 93,669 | 84,773 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 83,447 | 79,911 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 55,500 | 76,468 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 65,525 | 93,034 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 73,727 | 84,355 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 53,148 | 13,703 | |
| Financing Receivable, Term Loan | 425,016 | 432,244 | |
| Financing Receivable, Revolving | 9,709 | 0 | |
| Loans | 434,725 | 432,244 | |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Grades 5-7 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 145,795 | 194,634 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 153,731 | 220,681 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 170,018 | 84,897 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 77,964 | 91,569 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 69,335 | 85,828 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 51,411 | 10,569 | |
| Financing Receivable, Term Loan | 668,254 | 688,178 | |
| Financing Receivable, Revolving | 4,963 | 0 | |
| Loans | 673,217 | 688,178 | |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Grades 8-9 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 2,732 | 7,982 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Term Loan | 2,732 | 7,982 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 2,732 | 7,982 | |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 205,967 | 98,237 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 69,388 | 221,338 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 160,531 | 42,613 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 37,408 | 67,303 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 34,327 | 39,526 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 29,603 | 6,765 | |
| Financing Receivable, Term Loan | 537,224 | 475,782 | |
| Financing Receivable, Revolving | 0 | 37 | |
| Loans | 537,224 | 475,819 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing receivable, term loan write offs | 0 | 0 | |
| Financing Receivable, Revolving, Writeoff | 0 | 0 | |
| Current-period gross write-offs | 0 | 0 | (0) |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Grades 1-4 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 40,264 | 16,271 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 13,603 | 46,870 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 32,341 | 10,107 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 9,449 | 62,744 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 32,465 | 33,337 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 23,399 | 3,780 | |
| Financing Receivable, Term Loan | 151,521 | 173,109 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 151,521 | 173,109 | |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Grades 5-7 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 165,703 | 81,919 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 55,785 | 174,468 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 128,190 | 32,506 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 27,959 | 4,559 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,862 | 5,626 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 6,204 | 2,985 | |
| Financing Receivable, Term Loan | 385,703 | 302,063 | |
| Financing Receivable, Revolving | 0 | 37 | |
| Loans | 385,703 | 302,100 | |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Grades 8-9 [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 47 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 | 563 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Term Loan | 0 | 610 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 0 | 610 | |
| Retail Portfolio Segment [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 68,637 | 78,212 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 61,086 | 125,815 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 109,530 | 310,215 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 284,492 | 204,223 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 182,868 | 73,413 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 109,185 | 47,764 | |
| Financing Receivable, Term Loan | 815,798 | 839,642 | |
| Financing Receivable, Revolving | 87,428 | 53,835 | |
| Loans | 903,226 | 893,477 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 20 | 10 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 9 | 1 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 91 | 19 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 22 | 41 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 61 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 3 | 5 | |
| Financing receivable, term loan write offs | 206 | 76 | |
| Financing Receivable, Revolving, Writeoff | 14 | 11 | |
| Current-period gross write-offs | 220 | 87 | |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 62,063 | 72,349 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 52,787 | 122,807 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 102,474 | 308,787 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 281,125 | 203,491 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 181,589 | 73,052 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 108,249 | 47,111 | |
| Financing Receivable, Term Loan | 788,287 | 827,597 | |
| Financing Receivable, Revolving | 2,570 | 0 | |
| Loans | 790,857 | 827,597 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 7 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 85 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 22 | 33 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 61 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 3 | 0 | |
| Financing receivable, term loan write offs | 178 | 33 | |
| Financing Receivable, Revolving, Writeoff | 0 | 0 | |
| Current-period gross write-offs | 178 | 33 | 414 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Performing Financial Instruments [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 62,063 | 72,349 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 52,546 | 122,718 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 102,023 | 307,161 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 280,078 | 203,052 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 181,242 | 73,052 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 107,389 | 46,290 | |
| Financing Receivable, Term Loan | 785,341 | 824,622 | |
| Financing Receivable, Revolving | 2,570 | 0 | |
| Loans | 787,911 | 824,622 | |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Nonperforming Financial Instruments [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 241 | 89 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 451 | 1,626 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,047 | 439 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 347 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 860 | 821 | |
| Financing Receivable, Term Loan | 2,946 | 2,975 | |
| Financing Receivable, Revolving | 0 | 0 | |
| Loans | 2,946 | 2,975 | |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 6,574 | 5,863 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 8,299 | 3,008 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 7,056 | 1,428 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,367 | 732 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,279 | 361 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 936 | 653 | |
| Financing Receivable, Term Loan | 27,511 | 12,045 | |
| Financing Receivable, Revolving | 84,858 | 53,835 | |
| Loans | 112,369 | 65,880 | |
| Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 20 | 10 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 2 | 1 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 6 | 19 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 0 | 8 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 0 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 0 | 5 | |
| Financing receivable, term loan write offs | 28 | 43 | |
| Financing Receivable, Revolving, Writeoff | 14 | 11 | |
| Current-period gross write-offs | 42 | 54 | $ 177 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Performing Financial Instruments [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 6,574 | 5,863 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 8,299 | 3,008 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 7,056 | 1,428 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,358 | 732 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,274 | 361 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 894 | 653 | |
| Financing Receivable, Term Loan | 27,455 | 12,045 | |
| Financing Receivable, Revolving | 84,833 | 53,835 | |
| Loans | 112,288 | 65,880 | |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Nonperforming Financial Instruments [Member] | |||
| Financing Receivable, Year One, Originated, Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 | 0 | |
| Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 9 | 0 | |
| Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 5 | 0 | |
| Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 42 | 0 | |
| Financing Receivable, Term Loan | 56 | 0 | |
| Financing Receivable, Revolving | 25 | 0 | |
| Loans | $ 81 | $ 0 | |
Note 3 - Loans and Allowance for Credit Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Balance | $ 54,454 | $ 49,914 | $ 42,246 |
| Provision for credit losses | 3,200 | 7,400 | 7,700 |
| Charge-offs | (3,115) | (3,837) | (863) |
| Recoveries | 1,254 | 977 | 831 |
| Initial allowance on PSL | 2,293 | ||
| Initial allowance on PCD loans | 105 | ||
| Balance | 58,191 | 54,454 | 49,914 |
| Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 42,246 | ||
| Commercial Portfolio Segment [Member] | |||
| Charge-offs | (2,895) | (3,750) | |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | |||
| Balance | 11,165 | 7,441 | 10,203 |
| Provision for credit losses | 438 | 7,109 | (2,822) |
| Charge-offs | (95) | (3,750) | (218) |
| Recoveries | 769 | 365 | 188 |
| Initial allowance on PSL | 283 | ||
| Initial allowance on PCD loans | 16 | ||
| Balance | 12,576 | 11,165 | 7,441 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 90 | ||
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 10,293 | ||
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | |||
| Balance | 367 | 384 | 490 |
| Provision for credit losses | (418) | (22) | (141) |
| Charge-offs | 0 | 0 | 0 |
| Recoveries | 5 | 5 | 35 |
| Initial allowance on PSL | 496 | ||
| Initial allowance on PCD loans | 28 | ||
| Balance | 478 | 367 | 384 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 490 | ||
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | |||
| Balance | 7,671 | 7,186 | 5,914 |
| Provision for credit losses | (654) | 314 | 1,255 |
| Charge-offs | 0 | 0 | (54) |
| Recoveries | 6 | 171 | 71 |
| Initial allowance on PSL | 569 | ||
| Initial allowance on PCD loans | 37 | ||
| Balance | 7,629 | 7,671 | 7,186 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 5,914 | ||
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | |||
| Balance | 10,919 | 9,852 | 9,242 |
| Provision for credit losses | 6,626 | 1,067 | 610 |
| Charge-offs | (2,800) | 0 | 0 |
| Recoveries | 0 | 0 | 0 |
| Initial allowance on PSL | 323 | ||
| Initial allowance on PCD loans | 6 | ||
| Balance | 15,074 | 10,919 | 9,852 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 9,242 | ||
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | |||
| Balance | 3,667 | 3,184 | 2,191 |
| Provision for credit losses | 1,810 | 468 | 967 |
| Charge-offs | 0 | 0 | 0 |
| Recoveries | 17 | 15 | 26 |
| Initial allowance on PSL | 20 | ||
| Initial allowance on PCD loans | 0 | ||
| Balance | 5,514 | 3,667 | 3,184 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 2,191 | ||
| Retail Portfolio Segment [Member] | |||
| Charge-offs | (220) | (87) | |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | |||
| Balance | 18,702 | 18,986 | 14,027 |
| Provision for credit losses | (4,974) | (474) | 5,638 |
| Charge-offs | (178) | (33) | (414) |
| Recoveries | 348 | 223 | 432 |
| Initial allowance on PSL | 289 | ||
| Initial allowance on PCD loans | 12 | ||
| Balance | 14,199 | 18,702 | 18,986 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | (697) | ||
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 13,330 | ||
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | |||
| Balance | 1,936 | 2,881 | 160 |
| Provision for credit losses | 316 | (1,089) | 2,212 |
| Charge-offs | (42) | (54) | (177) |
| Recoveries | 109 | 198 | 79 |
| Initial allowance on PSL | 313 | ||
| Initial allowance on PCD loans | 6 | ||
| Balance | 2,638 | 1,936 | 2,881 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 607 | ||
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | 767 | ||
| Unallocated Financing Receivables [Member] | |||
| Balance | 27 | 0 | 19 |
| Provision for credit losses | 56 | 27 | (19) |
| Charge-offs | 0 | 0 | 0 |
| Recoveries | 0 | 0 | 0 |
| Initial allowance on PSL | 0 | ||
| Initial allowance on PCD loans | 0 | ||
| Balance | $ 83 | $ 27 | 0 |
| Unallocated Financing Receivables [Member] | Revision of Prior Period, Reclassification, Adjustment [Member] | |||
| Balance | 0 | ||
| Unallocated Financing Receivables [Member] | Revision of Prior Period, After Reclassification [Member] | |||
| Balance | $ 19 | ||
Note 3 - Loans and Allowance for Credit Losses - Financial Effect by Type of Modification (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Contractual Interest Rate Reduction [Member] | ||
| Modified in period | $ 0 | $ 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member] | ||
| Modified in period | 0 | 0 |
| Contractual Interest Rate Reduction [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | ||
| Modified in period | 9,250 | 6,616 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | ||
| Modified in period | 9,250 | 6,616 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Modified in period | 9,250 | 6,574 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 42 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | Retail Portfolio Segment [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member] | ||
| Modified in period | 0 | 0 |
| Extended Maturity [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Retail Portfolio Segment [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Retail Portfolio Segment [Member] | Loans Categorized as 1-4 Family Mortgages [Member] | ||
| Modified in period | 0 | 0 |
| Principal Forgiveness [Member] | Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | ||
| Modified in period | $ 0 | $ 0 |
Note 3 - Loans and Allowance for Credit Losses - Amortized Cost of Modified Loans (Details) $ in Thousands |
Dec. 31, 2025
USD ($)
|
|---|---|
| Modified | $ 9,250 |
| Financial Asset, Not Past Due [Member] | |
| Modified | 9,250 |
| Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | |
| Modified | 9,250 |
| Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 9,250 |
| Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | |
| Modified | 9,250 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 9,250 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Not Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member] | |
| Modified | 0 |
| Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | |
| Modified | $ 0 |
Note 4 - Premises and Equipment, Net (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Depreciation | $ 5,200 | $ 6,000 | $ 6,000 |
| Operating Lease, Weighted Average Remaining Lease Term (Year) | 9 years 4 months 24 days | ||
| Operating Lease, Weighted Average Discount Rate, Percent | 6.52% | ||
| Operating Lease, Right-of-Use Asset | $ 3,900 | 4,400 | |
| Operating Lease, Expense | $ 1,600 | $ 1,600 | $ 2,000 |
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets | |
| Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities | Accrued Liabilities | |
| Operating Lease, Liability | $ 3,892 | $ 4,400 | |
| Minimum [Member] | |||
| Lessee, Operating Lease, Renewal Term (Year) | 3 years | ||
| Maximum [Member] | |||
| Lessee, Operating Lease, Renewal Term (Year) | 5 years | ||
Note 4 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Property, plant and equipment, gross | $ 116,568 | $ 103,043 |
| Less: accumulated depreciation | (54,100) | (49,616) |
| Total premises and equipment | 62,468 | 53,427 |
| Land and Land Improvements [Member] | ||
| Property, plant and equipment, gross | 16,250 | 14,021 |
| Building [Member] | ||
| Property, plant and equipment, gross | 68,733 | 62,365 |
| Furniture and Fixtures [Member] | ||
| Property, plant and equipment, gross | $ 31,585 | $ 26,657 |
Note 4 - Premises and Equipment, Net - Future Lease Payments (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| 2026 | $ 1,191 | |
| 2027 | 1,119 | |
| 2028 | 942 | |
| 2029 | 738 | |
| 2030 | 73 | |
| Thereafter | 1,141 | |
| Total undiscounted lease payments | 5,204 | |
| Less effect of discounting | (1,312) | |
| Present value of future lease payments (lease liability) | $ 3,892 | $ 4,400 |
Note 5 - Mortgage Loan Servicing (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Continuing Involvement with Transferred Financial Assets Custodial Escrow Balance | $ 14,500 | $ 10,900 |
| Valuation Allowance for Impairment of Recognized Servicing Assets, Balance | 0 | 0 |
| Servicing Asset at Fair Value, Amount | $ 21,400 | $ 21,000 |
| Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 10.00% | 10.50% |
| Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 9.13% | 7.81% |
| Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Credit Losses | 0.76% | 0.68% |
| Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life (Year) | 8 years 2 months 12 days | 8 years 8 months 12 days |
| Maximum [Member] | ||
| Late and Ancillary Fee Income Generated by Servicing Financial Assets, Amount | $ 100 | $ 100 |
Note 5 - Mortgage Loan Servicing - Mortgage Loans Serviced for Others (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Mortgage loans serviced for others | $ 1,686,854 | $ 1,550,830 |
| Federal Home Loan Mortgage Corporation [Member] | ||
| Mortgage loans serviced for others | 1,422,337 | 1,364,485 |
| Federa lHome Loan Bank [Member] | ||
| Mortgage loans serviced for others | 264,517 | 176,540 |
| Other [Member] | ||
| Mortgage loans serviced for others | $ 0 | $ 9,805 |
Note 5 - Mortgage Loan Servicing - Activity for Capitalized Mortgage Loan Servicing Rights (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Balance at beginning of year | $ 12,475 | $ 11,343 |
| Additions | 4,544 | 4,465 |
| Amortized to expense | (3,854) | (3,333) |
| Balance at end of year | 13,604 | 12,475 |
| Eastern Michigan Financial Corp. [Member] | ||
| Acquired from Eastern Michigan Bank | $ 439 | $ 0 |
Note 6 - Deposits (Details Textual) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Time Deposits, at or Above FDIC Insurance Limit | $ 551.0 | $ 570.0 |
| Loans [Member] | ||
| Deposit Overdrafts | $ 0.6 | $ 1.0 |
Note 6 - Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Noninterest-bearing | $ 1,339,666 | $ 1,264,523 |
| Noninterest-bearing demand, percentage | 25.40% | 26.90% |
| Noninterest-bearing demand, percent increase (decrease) | 5.90% | |
| Interest-bearing checking | $ 957,598 | $ 738,291 |
| Interest-bearing checking, percentage | 18.10% | 15.70% |
| Interest-bearing checking, percent increase (decrease) | 29.70% | |
| Money market | $ 1,697,604 | $ 1,516,436 |
| Money market, percentage | 32.10% | 32.30% |
| Money market, percent increase (decrease) | 11.90% | |
| Savings | $ 310,227 | $ 221,900 |
| Savings, percentage | 5.90% | 4.70% |
| Savings, percent increase (decrease) | 39.80% | |
| Time deposits | $ 848,844 | $ 807,517 |
| Time Deposits, percentage | 16.10% | 17.20% |
| Time Deposits, percent increase (decrease) | 5.10% | |
| Total local deposits | $ 5,153,939 | $ 4,548,667 |
| Total local deposits, percentage | 97.60% | 96.80% |
| Total local deposits | 13.30% | |
| Out-of-area time, $100,000 and over | $ 130,513 | $ 149,699 |
| Out-of-area time, $100,000 and over, percentage | 2.40% | 3.20% |
| Out-of-area time, $100,000 and over, percent increase (decrease) | (12.80%) | |
| Total deposits | $ 5,284,452 | $ 4,698,366 |
| Total deposits, percentage | 100.00% | 100.00% |
| Total deposits, percent increase (decrease) | 12.50% |
Note 6 - Deposits - Maturity Distribution for Certificate of Deposits (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| In one year or less | $ 914,764 | $ 880,165 |
| In one to two years | 43,444 | 53,660 |
| In two to three years | 9,330 | 14,315 |
| In three to four years | 8,398 | 2,301 |
| In four to five years | 3,421 | 6,775 |
| Total certificates of deposit | $ 979,357 | $ 957,216 |
Note 7 - Securities Sold Under Agreements to Repurchase (Details Textual) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements (Year) | 1 year |
Note 7 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Securities sold under agreements to repurchase | $ 232,291 | $ 121,521 |
| Average daily balance during the year | 239,089 | 224,878 |
| Maximum daily balance during the year | $ 285,679 | $ 278,227 |
| Securities Sold under Agreements to Repurchase [Member] | ||
| Weighted average interest rate at year end | 2.80% | 2.17% |
| Weighted average interest rate during the year | 3.12% | 3.43% |
Note 8 - Other Borrowings (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 24, 2025 |
Jan. 14, 2022 |
Dec. 15, 2021 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Long-Term Federal Home Loan Bank Advances | $ 326,221 | $ 387,083 | |||
| Line of Credit Facility, Maximum Borrowing Capacity | 1,080,000 | ||||
| Line of Credit Facility, Remaining Borrowing Capacity | $ 777,000 | ||||
| Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] | |||
| Subordinated Notes [Member] | |||||
| Subordinated Debt, Principal Amount | $ 15,000 | $ 75,000 | |||
| Subordinated Borrowing, Interest Rate | 3.25% | ||||
| Subordinated Borrowing, Redemption Price, Percentage of Principal Amount | 100.00% | ||||
| Debt Instrument, Basis Spread on Variable Rate | 2.12% | ||||
| Proceeds Injected, Increase to Equity Capital From Issuance of Subordinated Long-term Debt | $ 15,000 | $ 70,000 | |||
| Debt Issuance Costs, Gross | $ 300 | 700 | |||
| Term Note [Member] | |||||
| Debt Instrument, Face Amount | $ 30,000 | ||||
| Debt Instrument, Interest Rate, Stated Percentage | 1.70% | ||||
| Debt Instrument, Periodic Payment, Principal | $ 2,500 | ||||
| Term Note [Member] | Minimum [Member] | |||||
| Debt Instrument, Basis Spread on Variable Rate | 0.00% | ||||
| Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | |||||
| Long-Term Federal Home Loan Bank Advances | $ 300,000 | $ 360,000 | |||
| Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Minimum [Member] | |||||
| Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End | 0.90% | 0.70% | |||
| Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Maximum [Member] | |||||
| Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End | 4.50% | 4.54% | |||
| Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Weighted Average [Member] | |||||
| Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End | 3.27% | 3.10% | |||
| Federal Home Loan Bank of Indianapolis [Member] | Amortizing Advances [Member] | |||||
| Long-Term Federal Home Loan Bank Advances | $ 26,200 | $ 27,100 | |||
| Federal Home Loan Bank of Indianapolis [Member] | Amortizing Advances [Member] | Weighted Average [Member] | |||||
| Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End | 2.52% | 2.52% |
Note 8 - Other Borrowings - Maturities of Currently Outstanding FHLB Advances (Details) - Bullet Advances [member] - Federal Home Loan Bank of Indianapolis [Member] $ in Thousands |
Dec. 31, 2025
USD ($)
|
|---|---|
| 2026 | $ 80,000 |
| 2027 | 100,000 |
| 2028 | 90,000 |
| 2029 | 10,000 |
| 2030 | 20,000 |
| Thereafter | $ 0 |
Note 8 - Other Borrowings - Maturities of Currently Outstanding FHLBI Amortizing Advances (Details) - Federal Home Loan Bank of Indianapolis [Member] - Amortizing Advances [Member] $ in Thousands |
Dec. 31, 2025
USD ($)
|
|---|---|
| 2026 | $ 900 |
| 2027 | 938 |
| 2028 | 979 |
| 2029 | 1,022 |
| 2030 | 1,065 |
| Thereafter | $ 21,317 |
Note 9 - Federal Income Taxes (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% |
| Deferred Tax Assets, Valuation Allowance | $ 0 | $ 0 | |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 | $ 0 | $ 0 |
| Eastern Michigan Financial Corp. [Member] | |||
| Operating Loss Carryforwards | $ 7,300 | ||
Note 9 - Federal Income Taxes - Consolidated Income Tax Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Current expense | $ 12,655 | $ 19,090 | $ 22,518 |
| Deferred expense (benefit) | 2,085 | (397) | (2,036) |
| Tax expense | $ 14,740 | $ 18,693 | $ 20,482 |
Note 9 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Tax at U.S. statutory rate | $ 21,734 | $ 20,640 | $ 21,567 |
| Tax at U.S. statutory rate, percent | 21.00% | 21.00% | 21.00% |
| Tax credits net of proportional amortization and tax losses | $ (1,929) | $ (266) | $ 24 |
| Tax credits net of proportional amortization and tax losses, percent | (1.90%) | (0.30%) | 0.00% |
| Discount of purchased tax credits | $ (3,525) | ||
| Discount of purchased tax credits, percent | (3.40%) | ||
| Tax-exempt interest, net of interest expense disallowance | $ (1,265) | $ (1,027) | $ (862) |
| Tax-exempt interest, net of interest expense disallowance, percent | (1.20%) | (1.00%) | (0.80%) |
| Bank owned life insurance, amount | $ (683) | $ (529) | $ (303) |
| Bank owned life insurance, percent | (0.70%) | (0.50%) | (0.30%) |
| Non-deductible expenses, amount | $ 538 | $ 241 | $ 213 |
| Non-deductible expenses, percent | 0.50% | 0.20% | 0.20% |
| Other, amount | $ (130) | $ (366) | $ (157) |
| Other, percent | (0.10%) | (0.40%) | (0.20%) |
| Tax expense | $ 14,740 | $ 18,693 | $ 20,482 |
| Tax expense, percent | 14.20% | 19.00% | 19.90% |
Note 9 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) (Parentheticals) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Tax Jurisdiction of Domicile [Extensible Enumeration] | Domestic Tax Jurisdiction [Member] | Domestic Tax Jurisdiction [Member] | Domestic Tax Jurisdiction [Member] |
Note 9 - Federal Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Allowance for credit losses | $ 12,228 | $ 11,435 |
| Deferred compensation | 375 | 269 |
| Stock compensation | 977 | 1,011 |
| Nonaccrual loan interest income | 220 | 192 |
| Unrealized loss on securities | 6,379 | 13,245 |
| Lease liability | 792 | 928 |
| Net operating loss carryforward | 1,525 | 0 |
| Other | 850 | 567 |
| Deferred tax asset | 23,346 | 27,647 |
| Depreciation | 321 | 259 |
| Prepaid expenses | 780 | 685 |
| Mortgage loan servicing rights | 2,857 | 2,620 |
| Deferred loan fees and costs | 266 | 471 |
| Right of use lease asset | 792 | 928 |
| Securities discount accretion | 2,056 | 686 |
| Business combination adjustments | 4,849 | 1,626 |
| Other | 167 | 163 |
| Deferred tax liability | 12,088 | 7,438 |
| Total net deferred tax asset | $ 11,258 | $ 20,209 |
Note 10 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 292,600 | ||
| Performance Shares [Member] | Executive Officer [Member] | |||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 16,589 | 0 | 25,239 |
| Noninterest Expense [Member] | |||
| Share-Based Payment Arrangement, Expense | $ 3.5 | $ 3.3 | $ 3.4 |
Note 10 - Stock-based Compensation - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member] - Mercantile Plans [Member] |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
$ / shares
shares
| |
| Nonvested at beginning of year (in shares) | shares | 228,646 |
| Nonvested at beginning of year, weighted average fair value (in dollars per share) | $ / shares | $ 35.84 |
| Grants (in shares) | shares | 84,685 |
| Grants, weighted average fair value (in dollars per share) | $ / shares | $ 50.34 |
| Vested (in shares) | shares | (109,158) |
| Vested, weighted average fair value (in dollars per share) | $ / shares | $ 32.1 |
| Forfeited (in shares) | shares | (4,771) |
| Forfeited, weighted average fair value (in dollars per share) | $ / shares | $ 42.7 |
| Nonvested at end of year (in shares) | shares | 199,402 |
| Nonvested at end of year, weighted average fair value (in dollars per share) | $ / shares | $ 43.31 |
Note 10 - Stock-based Compensation - Shares Grant to Board Directors (Details) - Corporate and Bank Board Directors [Member] - USD ($) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Shares Granted (in shares) | 10,007 | 11,316 | 11,529 | 11,166 |
| Total Cost | $ 444 | $ 423 | $ 350 | $ 359 |
Note 11 - Related Parties (Details Textual) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Related Party Deposits and Repurchase Agreements | $ 36,600 | $ 17,900 | |
| Directors and Executive Officers [Member] | |||
| Loan Commitments to Related Parties | 11,300 | 20,400 | |
| Loans and Leases Receivable, Related Parties | $ 6,319 | $ 7,770 | $ 89,507 |
Note 11 - Related Parties - Loans Outstanding to Directors and Executive Officers (Details) - Directors and Executive Officers [Member] - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Beginning balance | $ 7,770 | $ 89,507 |
| New loans | 750 | 1,898 |
| Repayments | (2,201) | (3,788) |
| Effect of changes in related parties | 0 | (79,847) |
| Ending balance | $ 6,319 | $ 7,770 |
Note 12 - Commitments and Off-balance-sheet Risk (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Financing Receivable, Allowance for Credit Loss | $ 58,191 | $ 54,454 | $ 49,914 | $ 42,246 |
| Term Debt, Secured by Real Estate Balloon Payment, Period (Year) | 5 years | |||
| Minimum [Member] | ||||
| Amortization Period for Term Debt, Secured by Real Estate (Year) | 10 years | |||
| Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year) | 3 years | |||
| Maximum [Member] | ||||
| Amortization Period for Term Debt, Secured by Real Estate (Year) | 25 years | |||
| Term Debt Secured, by Non-real Estate Collateral Maturity Period (Year) | 7 years | |||
| Retail and Commercial Lines of Credit and Credit Card Receivables [Member] | ||||
| Financing Receivable, Allowance for Credit Loss | $ 2,300 | $ 1,000 | ||
| Commercial Line of Credit Facilities [Member] | Minimum [Member] | ||||
| Line of Credit Facility, Expiration Period (Month) | 12 months | |||
| Commercial Line of Credit Facilities [Member] | Maximum [Member] | ||||
| Line of Credit Facility, Expiration Period (Month) | 24 months |
Note 12 - Commitments and Off-balance-sheet Risk - Exposure to Credit Losses (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Contractual amounts of financial instruments with off-balance sheet risk | $ 2,472,603 | $ 2,101,302 |
| Standby Letters of Credit [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | 26,813 | 26,491 |
| Unused lines of Credit [Member] | Commercial Portfolio Segment [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | 1,755,132 | 1,488,782 |
| Unused lines of Credit [Member] | One to Four Family Mortgages [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | 135,021 | 84,298 |
| Unused lines of Credit [Member] | Credit Card Lines of Credit [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | 204,783 | 172,273 |
| Unused lines of Credit [Member] | Consumer Other Financing Receivable 1 [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | 53,124 | 33,892 |
| Loan Origination Commitments [Member] | ||
| Contractual amounts of financial instruments with off-balance sheet risk | $ 297,730 | $ 295,566 |
Note 12 - Commitments and Off-balance-sheet Risk - Instruments Carried at Fair Values (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Contractual amounts of financial instruments with off-balance sheet risk | $ 2,472,603 | $ 2,101,302 |
| Standby Letters of Credit [Member] | ||
| Standby letters of credit, contract amount | 26,813 | 26,491 |
| Contractual amounts of financial instruments with off-balance sheet risk | $ 184 | $ 175 |
Note 13 - Benefit Plans (Details Textual) - USD ($) $ in Millions |
12 Months Ended | 93 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2025 |
|
| Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 5.00% | |||
| Defined Contribution Plan, Cost | $ 2.8 | $ 2.6 | $ 2.3 | |
| Interest Expense, Deferred Compensation Plan | $ 0.1 | $ 0.1 | $ 0.1 | |
| Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 2,954 | 1,194 | 1,410 | |
| The 2025 Employee Stock Purchase Plan [Member] | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Employee Payroll Deduction | 5.00% | 5.00% | ||
| Common Stock, Capital Shares Reserved for Future Issuance (in shares) | 200,000 | 200,000 | ||
| Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 2,356 | |||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 198,000 | 198,000 | ||
| The 2025 Employee Stock Purchase Plan [Member] | Maximum [Member] | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent | 95.00% | |||
| Mercantile Bank Corporation Employee Stock Purchase Plan of 2014 [Member] | Common Stock Including Additional Paid in Capital [Member] | ||||
| Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 598 | 1,194 | ||
| Other Liabilities [Member] | ||||
| Deferred Compensation Liability, Current and Noncurrent | $ 1.8 | $ 1.3 | $ 1.8 | |
Note 14 - Derivatives and Hedging Activities (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Other Noninterest Expense | $ 18,360 | $ 15,925 | $ 17,767 |
| Interest Rate Swap [Member] | |||
| Other Noninterest Expense | $ 100 | $ 100 | |
Note 14 - Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Interest Rate Swap Assets [Member] | ||
| Notional Amount | $ 961,474 | $ 866,157 |
| Interest Rate Swap [Member] | ||
| Derivative Assets Interest rate swaps | 23,212 | 26,793 |
| Derivative Liabilities Interest rate swaps | 23,532 | 27,050 |
| Interest Rate Swap Liabilities [Member] | ||
| Notional Amount | $ 959,447 | $ 864,130 |
Note 14 - Derivatives and Hedging Activities - The Netting Arrangement of Derivative Instruments (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Derivative Assets Interest rate swaps | $ 23,212 | $ 26,793 |
| Financial instruments, derivative assets | 9,711 | 3,064 |
| Cash collateral, derivative assets | 1,540 | 19,040 |
| Net amount, derivative assets | 11,961 | 4,689 |
| Derivative Liabilities Interest rate swaps | 23,532 | 27,050 |
| Financial instruments, derivative liability | 9,711 | 2,915 |
| Cash collateral, derivative liability | 6,900 | 1,640 |
| Net amount, derivative liability | $ 6,921 | $ 22,495 |
Note 15 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
||||
|---|---|---|---|---|---|---|
| Securities available for sale | $ 1,102,230 | $ 730,352 | ||||
| Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 17,300 | 16,000 | ||||
| Interest Rate Swap [Member] | ||||||
| Derivative Asset | 23,212 | 26,793 | ||||
| Interest rate swaps | 23,532 | 27,050 | ||||
| Fair Value, Inputs, Level 1 [Member] | ||||||
| Securities available for sale | 0 | 0 | ||||
| Reported Value Measurement [Member] | ||||||
| Securities available for sale | [1] | 1,102,230 | 730,352 | |||
| Federal Home Loan Bank stock | [2] | 22,099 | 21,513 | |||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | ||||||
| Cash and cash equivalents | 473,324 | 393,010 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | ||||||
| Loans, net | 4,763,697 | 4,546,327 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ||||||
| Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 17,160 | 15,824 | ||||
| Accrued interest receivable | 23,638 | 21,401 | ||||
| Deposits | 5,284,452 | 4,698,366 | ||||
| Securities sold under agreements to repurchase | 232,291 | 121,521 | ||||
| Federal Home Loan Bank advances | 326,221 | 387,083 | ||||
| Accrued interest payable | 9,921 | 10,201 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Note [Member] | ||||||
| Term note | 30,000 | 0 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member] | ||||||
| Subordinated debt | 51,015 | 50,330 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member] | ||||||
| Subordinated debt | 89,657 | 89,314 | ||||
| Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | ||||||
| Derivative Asset | 23,212 | 26,793 | ||||
| Interest rate swaps | 23,532 | 27,050 | ||||
| Estimate of Fair Value Measurement [Member] | ||||||
| Securities available for sale | [1] | 1,102,230 | 730,352 | |||
| Federal Home Loan Bank stock | [2] | 22,099 | 21,513 | |||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | ||||||
| Cash and cash equivalents | 473,324 | 393,010 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | ||||||
| Loans, net | 4,830,844 | 4,558,628 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ||||||
| Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 17,319 | 16,047 | ||||
| Accrued interest receivable | 23,638 | 21,401 | ||||
| Deposits | 5,024,489 | 4,541,896 | ||||
| Securities sold under agreements to repurchase | 232,291 | 121,521 | ||||
| Federal Home Loan Bank advances | 321,069 | 374,499 | ||||
| Accrued interest payable | 9,921 | 10,201 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Note [Member] | ||||||
| Term note | 30,000 | 0 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Debentures [Member] | ||||||
| Subordinated debt | 51,019 | 50,336 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Subordinated Notes [Member] | ||||||
| Subordinated debt | 86,826 | 81,825 | ||||
| Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | ||||||
| Derivative Asset | 23,212 | 26,793 | ||||
| Interest rate swaps | $ 23,532 | $ 27,050 | ||||
| ||||||
Note 16 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Debt Securities, Available-for-Sale | $ 1,102,230 | $ 730,352 |
| Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | $ 17,300 | 16,000 |
| Maximum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member] | ||
| Fair Value Inputs, Discount Factor | 50.00% | |
| Minimum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member] | ||
| Fair Value Inputs, Discount Factor | 25.00% | |
| Weighted Average [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member] | ||
| Fair Value Inputs, Discount Factor | 40.90% | |
| Weighted Average [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Residential Real Estate [Member] | ||
| Fair Value Inputs, Discount Factor | 25.80% | |
| Municipal General Obligation Bonds [Member] | ||
| Debt Securities, Available-for-Sale | $ 215,063 | 180,170 |
| Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Inputs, Level 3 [Member] | Municipal General Obligation Bonds [Member] | Maximum [Member] | ||
| Debt Securities, Available-for-Sale, Decrease Due to Scheduled Maturities | 400 | 100 |
| Available-for-Sale Securities [Member] | ||
| SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance | $ 0 | $ 0 |
Note 16 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Debt Securities, Available-for-Sale | $ 1,102,230 | $ 730,352 |
| Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| US Treasury Securities [Member] | ||
| Debt Securities, Available-for-Sale | 55,501 | |
| US Government Agencies Debt Securities [Member] | ||
| Debt Securities, Available-for-Sale | 639,773 | 495,581 |
| Collateralized Mortgage-Backed Securities [Member] | ||
| Debt Securities, Available-for-Sale | 75,762 | 25,368 |
| Municipal General Obligation Bonds [Member] | ||
| Debt Securities, Available-for-Sale | 215,063 | 180,170 |
| Municipal Revenue Bonds [Member] | ||
| Debt Securities, Available-for-Sale | 65,004 | 28,733 |
| Other Debt and Equity Securities [Member] | ||
| Debt Securities, Available-for-Sale | 51,127 | 500 |
| Fair Value, Recurring [Member] | ||
| Total | 1,125,442 | 757,145 |
| Total liabilities | 23,532 | 27,050 |
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Total | 0 | 0 |
| Total liabilities | 0 | 0 |
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Total | 1,125,442 | 756,752 |
| Total liabilities | 23,532 | 27,050 |
| Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Total | 0 | 393 |
| Total liabilities | 0 | 0 |
| Fair Value, Recurring [Member] | US Treasury Securities [Member] | ||
| Debt Securities, Available-for-Sale | 55,501 | |
| Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | |
| Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 55,501 | |
| Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | |
| Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | ||
| Debt Securities, Available-for-Sale | 639,773 | 495,581 |
| Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 639,773 | 495,581 |
| Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] | ||
| Debt Securities, Available-for-Sale | 75,762 | 25,368 |
| Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 75,762 | 25,368 |
| Fair Value, Recurring [Member] | Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Municipal General Obligation Bonds [Member] | ||
| Debt Securities, Available-for-Sale | 215,063 | 180,170 |
| Fair Value, Recurring [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 215,063 | 179,777 |
| Fair Value, Recurring [Member] | Municipal General Obligation Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 393 |
| Fair Value, Recurring [Member] | Municipal Revenue Bonds [Member] | ||
| Debt Securities, Available-for-Sale | 65,004 | 28,733 |
| Fair Value, Recurring [Member] | Municipal Revenue Bonds [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Municipal Revenue Bonds [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 65,004 | 28,733 |
| Fair Value, Recurring [Member] | Municipal Revenue Bonds [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Other Debt and Equity Securities [Member] | ||
| Debt Securities, Available-for-Sale | 51,127 | 500 |
| Fair Value, Recurring [Member] | Other Debt and Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Other Debt and Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Debt Securities, Available-for-Sale | 51,127 | 500 |
| Fair Value, Recurring [Member] | Other Debt and Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Debt Securities, Available-for-Sale | 0 | 0 |
| Fair Value, Recurring [Member] | Interest Rate Swap [Member] | ||
| Derivative Asset | 23,212 | 26,793 |
| Interest rate swaps | 23,532 | 27,050 |
| Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] | ||
| Derivative Asset | 0 | 0 |
| Interest rate swaps | 0 | 0 |
| Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | ||
| Derivative Asset | 23,212 | 26,793 |
| Interest rate swaps | 23,532 | 27,050 |
| Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] | ||
| Derivative Asset | 0 | 0 |
| Interest rate swaps | $ 0 | $ 0 |
Note 16 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Collateral dependent loans | $ 991 | $ 2,173 |
| Total | 991 | 2,173 |
| Fair Value, Inputs, Level 1 [Member] | ||
| Collateral dependent loans | 0 | 0 |
| Total | 0 | 0 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Collateral dependent loans | 0 | 0 |
| Total | 0 | 0 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Collateral dependent loans | 991 | 2,173 |
| Total | $ 991 | $ 2,173 |
Note 17 - Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Goodwill | $ 72,656 | $ 49,473 |
| Eastern Michigan Financial Corp. [Member] | ||
| Cash | 50,876 | |
| Common stock (924,999 shares issued at $48.55 per share) | 44,909 | |
| Total consideration | 95,785 | |
| Cash and due from banks | 62,361 | |
| Interest-earning deposits | 42,084 | |
| Securities available for sale | 198,365 | |
| Loans, net | 201,320 | |
| Premises and equipment | 7,482 | |
| Other assets | 16,593 | |
| Total identifiable assets acquired | 548,593 | |
| Deposits | 474,898 | |
| Other liabilities | 1,093 | |
| Total identifiable liabilities acquired | 475,991 | |
| Net identifiable assets acquired | 72,602 | |
| Goodwill | 23,183 | |
| Eastern Michigan Financial Corp. [Member] | Core Deposits [Member] | ||
| Core deposit intangible | $ 20,388 |
Note 17 - Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) (Parentheticals) - Eastern Michigan Financial Corp. [Member] |
Dec. 31, 2025
$ / shares
shares
|
|---|---|
| Business Combination, Share Price (in dollars per share) | $ / shares | $ 48.55 |
| Business Combination, Consideration Transferred, Equity Interest, Share Issued (in shares) | shares | 924,999 |
Note 17 - Business Combinations - Business Combination, Pro Forma Information (Details) - Eastern Michigan Financial Corp. [Member] - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Net interest income | $ 223,697 | $ 212,864 |
| Provision for credit losses | 3,591 | 7,403 |
| Noninterest income | 43,691 | 42,555 |
| Noninterest expense | 153,391 | 142,451 |
| Income before income taxes | 110,406 | 105,565 |
| Income tax expense | 16,591 | 21,125 |
| Net income | $ 93,815 | $ 84,440 |
| Earnings per share (in dollars per share) | $ 5.47 | $ 4.98 |
Note 18 - Variable Interest Entities (Details Textual) $ in Thousands |
36 Months Ended | |||
|---|---|---|---|---|
|
Jan. 26, 2016
USD ($)
|
Jun. 01, 2014
USD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
|
| Number of Business Trusts | 5 | |||
| Business Combination Debt Assumed Number of Trusts | 4 | |||
| Fair Value Discount of Subordinated Debentures Related to Assumed Business Trusts at Time af Merger | $ 15,000 | |||
| Amortization of Fair Value Discount Related to Subordinated Debentures of Assumed Business Trusts | $ 700 | |||
| Amortization Period of Fair Value Discount Related to Subordinated Debentures of Assumed Business Trusts (Year) | 21 years 6 months | |||
| Preferred Securities of Subsidiary Trust | $ 48,900 | $ 48,300 | ||
| Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Total | 51,015 | 50,330 | ||
| Investment, Proportional Amortization Method, Elected, Amount | 51,500 | 38,900 | ||
| Investment Program, Proportional Amortization Method, Elected, Commitment | $ 31,100 | $ 34,400 | ||
| Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Other Assets | Other Assets | ||
| Mercantile Bank Capital Trust I [Member] | ||||
| Preferred Securities of Subsidiary Trust | $ 32,000 | $ 21,000 | ||
| Payments for Repurchase of Trust Preferred Securities | 11,000 | |||
| Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Total | 21,000 | |||
| Fund [Member] | Mercantile Bank Capital Trust I [Member] | ||||
| Preferred Securities of Subsidiary Trust | $ 11,000 | |||
| Five Business Trusts [Member] | ||||
| Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 100.00% |
Note 18 - Variable Interest Entities - Business Trusts (Details) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 15, 2021 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Jan. 26, 2016 |
|
| Preferred securities outstanding | $ 48.9 | $ 48.3 | ||
| Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] | ||
| Mercantile Bank Capital Trust I [Member] | ||||
| Preferred securities outstanding | $ 21.0 | $ 32.0 | ||
| Interest rate margin | 2.18% | |||
| Firstbank Capital Trust I [Member] | ||||
| Preferred securities outstanding | $ 10.0 | |||
| Interest rate margin | 1.99% | |||
| Firstbank Capital Trust II [Member] | ||||
| Preferred securities outstanding | $ 10.0 | |||
| Interest rate margin | 1.27% | |||
| Firstbank Capital Trust III [Member] | ||||
| Preferred securities outstanding | $ 7.5 | |||
| Interest rate margin | 1.35% | |||
| Firstbank Capital Trust IV [Member] | ||||
| Preferred securities outstanding | $ 7.5 | |||
| Interest rate margin | 1.35% |
Note 18 - Variable Interest Entities - Unconsolidated Variable Interest Entities (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Aggregate Assets | $ 6,835,219 | $ 6,052,161 |
| Aggregate Liabilities | 6,110,335 | 5,467,635 |
| Variable Interest Entity, Not Primary Beneficiary [Member] | ||
| Aggregate Assets | 58,074 | 58,074 |
| Aggregate Liabilities | 56,000 | 56,000 |
| Risk of Loss | 2,074 | 2,074 |
| Variable Interest Entity, Primary Beneficiary [Member] | ||
| Aggregate Assets | 51,467 | 38,902 |
| Aggregate Liabilities | 31,090 | 34,428 |
| Risk of Loss | $ 20,377 | $ 4,474 |
Note 18 - Variable Interest Entities - Expected Payments for Unfunded Contributions Related to Investments in Tax Credit Investments (Details) $ in Thousands |
Dec. 31, 2025
USD ($)
|
|---|---|
| 2026 | $ 30,965 |
| 2027 | 51 |
| 2028 | 11 |
| 2029 | 11 |
| 2030 | 11 |
| Thereafter | $ 39 |
Note 19 - Regulatory Matters (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |
3 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
May 31, 2021 |
Dec. 31, 2009 |
|
| Capital Conservation Buffer | 2.50% | 2.50% | |||||||
| Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy to Risk Weighted Assets | 0.07 | 0.07 | |||||||
| Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.085 | 0.085 | |||||||
| Capital Required for Capital Adequacy to Risk Weighted Assets | 0.105 | 0.105 | |||||||
| Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval | $ 12.0 | $ 12.0 | |||||||
| Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 1.5 | $ 1.4 | $ 1.34 | ||||||
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | 6.8 | $ 6.8 | |||||||
| Stock Repurchase Program, Authorized Amount | $ 20.0 | ||||||||
| Stock Repurchased During Period, Shares (in shares) | 0 | 0 | |||||||
| Preferred Securities of Subsidiary Trust | 48.9 | $ 48.9 | $ 48.3 | ||||||
| Maximum Restricted Core Element Allowed in Tier One Capital Percent | 25.00% | ||||||||
| Maximum Level of Consolidated Aggregate Assets Allowing for Inclusion of Trust Preferred Securities in Tier One Capital | $ 15,000.0 | ||||||||
| Trust Preferred Securities Included in Tier One Capital | $ 48.9 | $ 48.9 | $ 48.3 | ||||||
| O 2025 Q1 Dividends [Member] | |||||||||
| Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.37 | ||||||||
| Dividends Payable, Date Declared | Jan. 16, 2025 | ||||||||
| Dividends Payable, Date to be Paid | Mar. 19, 2025 | ||||||||
| Dividends Payable, Date of Record | Mar. 07, 2025 | ||||||||
| O 2025 Q2 Dividends [Member] | |||||||||
| Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.37 | ||||||||
| Dividends Payable, Date Declared | Apr. 17, 2025 | ||||||||
| Dividends Payable, Date to be Paid | Jun. 18, 2025 | ||||||||
| Dividends Payable, Date of Record | Jun. 06, 2025 | ||||||||
| O 2025 Q3 Dividends [Member] | |||||||||
| Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.38 | ||||||||
| Dividends Payable, Date Declared | Jul. 17, 2025 | ||||||||
| Dividends Payable, Date to be Paid | Sep. 17, 2025 | ||||||||
| Dividends Payable, Date of Record | Sep. 05, 2025 | ||||||||
| O 2025 Q4 Dividends [Member] | |||||||||
| Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.38 | ||||||||
| Dividends Payable, Date Declared | Oct. 16, 2025 | ||||||||
| Dividends Payable, Date to be Paid | Dec. 17, 2025 | ||||||||
| Dividends Payable, Date of Record | Dec. 05, 2025 | ||||||||
| Eastern Michigan Financial Corp. [Member] | |||||||||
| Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval | $ 4.5 | $ 4.5 | |||||||
Note 19 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) $ in Thousands |
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
|---|---|---|
| Total capital minimum required for capital adequacy, ratio | 0.105 | |
| Tier 1 capital minimum required for capital adequacy, ratio | 0.085 | |
| Common equity tier 1 capital minimum required for capital adequacy, ratio | 0.07 | |
| Consolidated Entities [Member] | ||
| Total capital, amount | $ 854,876 | $ 777,857 |
| Total capital, ratio | 0.143 | 0.142 |
| Total capital minimum required for capital adequacy, amount | $ 476,702 | $ 439,031 |
| Total capital minimum required for capital adequacy, ratio | 0.08 | 0.08 |
| Tier 1 capital, amount | $ 704,776 | $ 633,134 |
| Tier 1 capital, ratio | 0.118 | 0.115 |
| Tier 1 capital minimum required for capital adequacy, amount | $ 357,526 | $ 329,274 |
| Tier 1 capital minimum required for capital adequacy, ratio | 0.06 | 0.06 |
| Common equity tier 1, amount | $ 655,835 | $ 584,879 |
| Common equity tier 1, ratio | 0.11 | 0.107 |
| Common equity tier 1 minimum required for capital adequacy, amount | $ 268,145 | $ 246,955 |
| Common equity tier 1 capital minimum required for capital adequacy, ratio | 0.045 | 0.045 |
| Tier 1 capital to average assets, amount | $ 704,776 | $ 633,134 |
| Tier 1 capital to average assets, ratio | 0.113 | 0.106 |
| Tier 1 capital to average assets, minimum required for capital adequacy, amount | $ 249,409 | $ 238,934 |
| Tier 1 capital to average assets minimum required for capital adequacy, ratio | 0.04 | 0.04 |
| Mercantile Bank [Member] | ||
| Total capital, amount | $ 775,664 | $ 759,146 |
| Total capital, ratio | 0.138 | 0.139 |
| Total capital minimum required for capital adequacy, amount | $ 449,498 | $ 435,793 |
| Total capital minimum required for capital adequacy, ratio | 0.08 | 0.08 |
| Total capital to be well capitalized, amount | $ 561,873 | $ 544,741 |
| Consolidated | 10.00% | 10.00% |
| Tier 1 capital, amount | $ 717,619 | $ 703,737 |
| Tier 1 capital, ratio | 0.128 | 0.129 |
| Tier 1 capital minimum required for capital adequacy, amount | $ 337,124 | $ 326,845 |
| Tier 1 capital minimum required for capital adequacy, ratio | 0.06 | 0.06 |
| Tier 1 capital to be well capitalized, amount | $ 449,498 | $ 435,793 |
| Tier 1 capital to be well capitalized, ratio | 0.08 | 0.08 |
| Common equity tier 1, amount | $ 717,619 | $ 703,737 |
| Common equity tier 1, ratio | 0.128 | 0.129 |
| Common equity tier 1 minimum required for capital adequacy, amount | $ 252,843 | $ 245,134 |
| Common equity tier 1 capital minimum required for capital adequacy, ratio | 0.045 | 0.045 |
| Common equity tier 1 capital to be well capitalized, amount | $ 365,217 | $ 354,082 |
| Common equity tier 1 capital to be well capitalized, ratio | 0.065 | 0.065 |
| Tier 1 capital to average assets, amount | $ 717,619 | $ 703,737 |
| Tier 1 capital to average assets, ratio | 0.115 | 0.119 |
| Tier 1 capital to average assets, minimum required for capital adequacy, amount | $ 248,738 | $ 237,447 |
| Tier 1 capital to average assets minimum required for capital adequacy, ratio | 0.04 | 0.04 |
| Tier 1 capital to average assets to be well capitalized, amount | $ 310,922 | $ 296,808 |
| Tier 1 capital to average assets to be well capitalized, ratio | 0.05 | 0.05 |
| Eastern Michigan Bank [Member] | ||
| Total capital, amount | $ 54,612 | |
| Total capital, ratio | 0.19 | |
| Total capital minimum required for capital adequacy, amount | $ 22,992 | |
| Total capital minimum required for capital adequacy, ratio | 0.08 | |
| Total capital to be well capitalized, amount | $ 28,740 | |
| Consolidated | 10.00% | |
| Tier 1 capital, amount | $ 52,214 | |
| Tier 1 capital, ratio | 0.182 | |
| Tier 1 capital minimum required for capital adequacy, amount | $ 17,244 | |
| Tier 1 capital minimum required for capital adequacy, ratio | 0.06 | |
| Tier 1 capital to be well capitalized, amount | $ 22,992 | |
| Tier 1 capital to be well capitalized, ratio | 0.08 | |
| Common equity tier 1, amount | $ 52,214 | |
| Common equity tier 1, ratio | 0.182 | |
| Common equity tier 1 minimum required for capital adequacy, amount | $ 12,933 | |
| Common equity tier 1 capital minimum required for capital adequacy, ratio | 0.045 | |
| Common equity tier 1 capital to be well capitalized, amount | $ 18,681 | |
| Common equity tier 1 capital to be well capitalized, ratio | 0.065 | |
| Tier 1 capital to average assets, amount | $ 52,214 | |
| Tier 1 capital to average assets, ratio | 0.107 | |
| Tier 1 capital to average assets, minimum required for capital adequacy, amount | $ 19,450 | |
| Tier 1 capital to average assets minimum required for capital adequacy, ratio | 0.04 | |
| Tier 1 capital to average assets to be well capitalized, amount | $ 24,313 | |
| Tier 1 capital to average assets to be well capitalized, ratio | 0.05 |
Note 20 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|
| Assets [Abstract] | ||||
| Other Assets | $ 217,954 | $ 169,909 | ||
| Total assets | 6,835,219 | 6,052,161 | ||
| LIABILITIES AND SHAREHOLDERS' EQUITY | ||||
| Liabilities | 6,110,335 | 5,467,635 | ||
| Subordinated debentures | 51,015 | 50,330 | ||
| Subordinated notes | 89,657 | 89,314 | ||
| Shareholders’ equity | 724,884 | 584,526 | $ 522,145 | $ 441,408 |
| Total liabilities and shareholders’ equity | 6,835,219 | 6,052,161 | ||
| Term Note [Member] | ||||
| LIABILITIES AND SHAREHOLDERS' EQUITY | ||||
| Term note | 30,000 | 0 | ||
| Parent Company [Member] | ||||
| Assets [Abstract] | ||||
| Cash and cash equivalents | 27,088 | 17,420 | ||
| Investments in subsidiaries | 849,962 | 691,563 | ||
| Other Assets | 21,411 | 18,188 | ||
| Total assets | 898,461 | 727,171 | ||
| LIABILITIES AND SHAREHOLDERS' EQUITY | ||||
| Liabilities | 2,905 | 3,001 | ||
| Subordinated debentures | 51,015 | 50,330 | ||
| Subordinated notes | 89,657 | 89,314 | ||
| Shareholders’ equity | 724,884 | 584,526 | ||
| Total liabilities and shareholders’ equity | 898,461 | 727,171 | ||
| Parent Company [Member] | Term Note [Member] | ||||
| LIABILITIES AND SHAREHOLDERS' EQUITY | ||||
| Term note | $ 30,000 | $ 0 |
Note 20 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Income | |||
| Interest and dividends from subsidiaries | $ 330,194 | $ 321,502 | $ 271,358 |
| Expenses | |||
| Federal income tax benefit | 14,740 | 18,693 | 20,482 |
| Net income | 88,753 | 79,593 | 82,217 |
| Other comprehensive income (loss) | 25,830 | 662 | 14,854 |
| Comprehensive income (loss) | 114,583 | 80,255 | 97,071 |
| Parent Company [Member] | |||
| Income | |||
| Interest and dividends from subsidiaries | 85,774 | 30,061 | 26,660 |
| Total income | 85,774 | 30,061 | 26,660 |
| Expenses | |||
| Interest expense | 7,671 | 8,203 | 8,091 |
| Other operating expenses | 7,885 | 5,647 | 5,674 |
| Total expenses | 15,556 | 13,850 | 13,765 |
| Income before income tax benefit and equity in undistributed net income of subsidiary | 70,218 | 16,211 | 12,895 |
| Federal income tax benefit | (3,251) | (3,240) | (2,858) |
| Equity in undistributed net income of subsidiary | 15,284 | 60,142 | 66,464 |
| Net income | 88,753 | 79,593 | 82,217 |
| Other comprehensive income (loss) | 25,830 | 662 | 14,854 |
| Comprehensive income (loss) | $ 114,583 | $ 80,255 | $ 97,071 |
Note 20 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Cash flows from operating activities | |||
| Net income | $ 88,753 | $ 79,593 | $ 82,217 |
| Adjustments to reconcile net income to net cash from operating activities: | |||
| Stock-based compensation expense | 3,473 | 3,316 | 3,384 |
| Stock grants to directors for retainer fees | 444 | 423 | 350 |
| Change in other assets | (59,097) | (25,797) | (30,189) |
| Change in other liabilities | (22,010) | 27,893 | 14,252 |
| Cash flows from investing activities | |||
| Net cash for investing activities | (105,704) | (425,436) | (395,932) |
| Cash flows from financing activities | |||
| Employee stock purchase plan | 128 | 50 | 45 |
| Dividend reinvestment plan | 772 | 810 | 891 |
| Cash dividends on common stock | (23,951) | (22,473) | (21,004) |
| Net cash for financing activities | 168,045 | 586,795 | 363,080 |
| Net change in cash and cash equivalents | 80,314 | 262,477 | 33,761 |
| Cash and cash equivalents at beginning of period | 393,010 | 130,533 | 96,772 |
| Cash and cash equivalents at end of period | 473,324 | 393,010 | 130,533 |
| Term Note [Member] | |||
| Cash flows from financing activities | |||
| Proceeds from term note issuance | 30,000 | 0 | 0 |
| Parent Company [Member] | |||
| Cash flows from operating activities | |||
| Net income | 88,753 | 79,593 | 82,217 |
| Adjustments to reconcile net income to net cash from operating activities: | |||
| Equity in undistributed net income of subsidiary | (15,284) | (60,142) | (66,464) |
| Stock-based compensation expense | 3,473 | 3,316 | 3,384 |
| Stock grants to directors for retainer fees | 444 | 423 | 350 |
| Change in other assets | (3,223) | (4,116) | (128) |
| Change in other liabilities | 932 | 990 | 1,045 |
| Net cash from operating activities | 75,095 | 20,064 | 20,404 |
| Cash flows from investing activities | |||
| Net capital investment into subsidiaries | (72,376) | 0 | 0 |
| Net cash for investing activities | (72,376) | 0 | 0 |
| Cash flows from financing activities | |||
| Employee stock purchase plan | 128 | 50 | 45 |
| Dividend reinvestment plan | 772 | 810 | 891 |
| Cash dividends on common stock | (23,951) | (22,473) | (21,004) |
| Net cash for financing activities | 6,949 | (21,613) | (20,068) |
| Net change in cash and cash equivalents | 9,668 | (1,549) | 336 |
| Cash and cash equivalents at beginning of period | 17,420 | 18,969 | 18,633 |
| Cash and cash equivalents at end of period | 27,088 | 17,420 | 18,969 |
| Parent Company [Member] | Term Note [Member] | |||
| Cash flows from financing activities | |||
| Proceeds from term note issuance | $ 30,000 | $ 0 | $ 0 |
Note 21 - Business Segment Information (Details Textual) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Number of Operating Segments | 2 |
| Number of Reportable Segments | 2 |
Note 21 - Business Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Goodwill | $ 72,656 | $ 49,473 |
| Core deposit intangible | 20,388 | 0 |
| Total assets | 6,835,219 | $ 6,052,161 |
| Core Deposits [Member] | ||
| Core deposit intangible | 20,388 | |
| Operating Segments [Member] | Mercantile Bank Segment [Member] | ||
| Goodwill | 32,171 | |
| Total assets | 6,241,994 | |
| Operating Segments [Member] | Mercantile Bank Segment [Member] | Core Deposits [Member] | ||
| Core deposit intangible | 0 | |
| Operating Segments [Member] | Eastern Michigan Bank Segment [Member] | ||
| Goodwill | 23,183 | |
| Total assets | 571,776 | |
| Operating Segments [Member] | Eastern Michigan Bank Segment [Member] | Core Deposits [Member] | ||
| Core deposit intangible | 20,388 | |
| Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | ||
| Goodwill | 17,302 | |
| Total assets | 1,014,523 | |
| Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] | Core Deposits [Member] | ||
| Core deposit intangible | 0 | |
| Consolidation, Eliminations [Member] | ||
| Goodwill | 0 | |
| Total assets | (993,074) | |
| Consolidation, Eliminations [Member] | Core Deposits [Member] | ||
| Core deposit intangible | $ 0 |
Note 22 - Subsequent Events (Details Textual) - Subsequent Event [Member] - O 2026 Q1 Dividends [Member] |
Jan. 15, 2026
$ / shares
|
|---|---|
| Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.39 |
| Dividends Payable, Date Declared | Jan. 15, 2026 |
| Dividends Payable, Date to be Paid | Mar. 18, 2026 |
| Dividends Payable, Date of Record | Mar. 06, 2026 |