Nature of Business and Summary of Significant Accounting Policy	3 Months Ended
Mar. 31, 2022
Nature of Business and Summary of Significant Accounting Policy
Nature of Business and Summary of Significant Accounting Policy	Note 1— Nature of Business and Summary of Significant Accounting Policy Nature of Banking Activities John Marshall Bancorp, Inc. (the “Company”), headquartered in Reston, Virginia, became the registered bank holding company under the Bank Holding Company Act of 1956 for its wholly-owned subsidiary, John Marshall Bank (the “Bank”), on March 1, 2017. This reorganization was completed through a one-for-one share exchange in which the Bank’s shareholders received one share of voting common stock of the Company in exchange for each share of the Bank’s voting common stock. The Company was formed on April 21, 2016 under the laws of the Commonwealth Virginia. The Bank was formed on April 5, 2005 under the laws of the Commonwealth of Virginia and was chartered as a bank on February 9, 2006, by the Virginia Bureau of Financial Institutions. The Bank is a member of the Federal Reserve System and is subject to the rules and regulations of the Virginia Bureau of Financial Institutions, the Board of Governors of the Federal Reserve System (the “Federal Reserve”) and the Federal Deposit Insurance Corporation (“FDIC”). The Bank opened for business on April 17, 2006 and provides banking services to its customers primarily in the Washington, D.C. metropolitan area. Basis of Presentation The accounting and reporting policies of John Marshall Bancorp, Inc. conform to generally accepted accounting principles in the United States of America (“GAAP”) and reflect practices of the banking industry. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial reporting and with applicable quarterly reporting regulations of the U.S. Securities and Exchange Commission (“SEC”). They do not include all of the information and notes required by GAAP for complete financial statements. As such, these consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto as of and for the year ending December 31, 2021, included in the Company’s Registration Statement on Form 10 as amended, filed with the SEC on April 18, 2022. The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany accounts and transactions between the Company and the Bank have been eliminated. In preparing financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the results of operations in these financial statements, have been made. The results of operations for the three months ended March 31, 2022 are not necessarily indicative of the results to be expected for any other interim period or for the full year. All amounts and discloses included in this quarterly report as of December 31, 2021, were derived from the Company’s audited consolidated financial statements. Certain items in the prior period financial statements have been reclassified to conform to the current presentation. These reclassifications had no effect on prior year net income or shareholders’ equity. Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments in this ASU, among other things, require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The FASB has issued multiple updates to ASU 2016-13 as codified in Topic 326, including ASUs 2019-04, 2019-05, 2019-10, 2019-11, 2020-02, and 2020-03. These ASUs have provided for various minor technical corrections and improvements to the codification as well as other transition matters. Smaller reporting companies who file with the U.S. Securities and Exchange Commission (“SEC”) and all other entities who do not file with the SEC are required to apply the guidance for fiscal years, and interim periods within those years, beginning after December 15, 2022. As part of the Company’s implementation efforts, we have engaged a third-party vendor, reconciled historical loan, charge-off and recovery data and determined segmentation of the loan portfolio for application of the current expected credit losses calculation. The Company is currently in the process of designing calculation methodologies under the new guidance and quantifying the approximate impact on the Company’s financial position and results of operation. We have engaged an external vendor to assist with model validation. In March 2022, the FASB issued ASU No. 2022-02, “Financial Instruments-Credit Losses (Topic 326), Troubled Debt Restructurings and Vintage Disclosures.” ASU 2022-02 addresses areas identified by the FASB as part of its post-implementation review of the credit losses standard (ASU 2016-13) that introduced the CECL model. The amendments eliminate the accounting guidance for troubled debt restructurings by creditors that have adopted the CECL model and enhance the disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. In addition, the amendments require a public business entity to disclose current-period gross write-offs for financing receivables and net investment in leases by year of origination in the vintage disclosures. The amendments in this ASU should be applied prospectively, except for the transition method related to the recognition and measurement of TDRs, where an entity has the option to apply a modified retrospective transition method resulting in a cumulative-effect adjustment to retained earnings in the period of adoption. For entities that have not yet adopted ASU 2016-13 (such as the Company), the effective dates for the provisions of ASU 2022-02 are the same as the effective dates in ASU 2016-13. Early adoption is permitted if an entity has adopted ASU 2016-13; however, the Company does not expect to adopt ASU 2016-13 in advance of the required implementation date. The Company is currently assessing the impact that ASU 2022-02 will have on its consolidated financial statements. In March 2020, the FASB issued ASU No. 2020-04 “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” These amendments provide temporary optional guidance to ease the potential burden in accounting for reference rate reform. The ASU provides optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued. It is intended to help stakeholders during the global market-wide reference rate transition period. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. Subsequently, in January 2021, the FASB issued ASU No. 2021-01 “Reference Rate Reform (Topic 848): Scope.” This ASU clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the transition. The ASU also amends the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. An entity may elect to apply ASU No. 2021-01 on contract modifications that change the interest rate used for margining, discounting, or contract price alignment retrospectively as of any date from the beginning of the interim period that includes March 12, 2020, or prospectively to new modifications from any date within the interim period that includes or is subsequent to January 7, 2021, up to the date that financial statements are available to be issued. An entity may elect to apply ASU No. 2021-01 to eligible hedging relationships existing as of the beginning of the interim period that includes March 12, 2020, and to new eligible hedging relationships entered into after the beginning of the interim period that includes March 12, 2020. As of March 31, 2022, the Company did not have any loans indexed to LIBOR. Subject to market conditions, the Company intends to refinance its subordinated debt in July 2022 when it becomes callable and converts to a floating rate note indexed to LIBOR

Nature of Business and Summary of Significant Accounting Policy

3 Months Ended

Mar. 31, 2022

Nature of Business and Summary of Significant Accounting Policy

Nature of Business and Summary of Significant Accounting Policy

Note 1— Nature of Business and Summary of Significant Accounting Policy

Nature of Banking Activities

John Marshall Bancorp, Inc. (the “Company”), headquartered in Reston, Virginia, became the registered bank holding company under the Bank Holding Company Act of 1956 for its wholly-owned subsidiary, John Marshall Bank (the “Bank”), on March 1, 2017. This reorganization was completed through a one-for-one share exchange in which the Bank’s shareholders received one share of voting common stock of the Company in exchange for each share of the Bank’s voting common stock. The Company was formed on April 21, 2016 under the laws of the Commonwealth Virginia. The Bank was formed on April 5, 2005 under the laws of the Commonwealth of Virginia and was chartered as a bank on February 9, 2006, by the Virginia Bureau of Financial Institutions. The Bank is a member of the Federal Reserve System and is subject to the rules and regulations of the Virginia Bureau of Financial Institutions, the Board of Governors of the Federal Reserve System (the “Federal Reserve”) and the Federal Deposit Insurance Corporation (“FDIC”). The Bank opened for business on April 17, 2006 and provides banking services to its customers primarily in the Washington, D.C. metropolitan area.

Basis of Presentation

The accounting and reporting policies of John Marshall Bancorp, Inc. conform to generally accepted accounting principles in the United States of America (“GAAP”) and reflect practices of the banking industry. The accompanying unaudited consolidated financial statements have been prepared in accordance with GAAP for interim financial reporting and with applicable quarterly reporting regulations of the U.S. Securities and Exchange Commission (“SEC”). They do not include all of the information and notes required by GAAP for complete financial statements. As such, these consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto as of and for the year ending December 31, 2021, included in the Company’s Registration Statement on Form 10 as amended, filed with the SEC on April 18, 2022.

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany accounts and transactions between the Company and the Bank have been eliminated. In preparing financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses.

In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the results of operations in these financial statements, have been made. The results of operations for the three months ended March 31, 2022 are not necessarily indicative of the results to be expected for any other interim period or for the full year. All amounts and discloses included in this quarterly report as of December 31, 2021, were derived from the Company’s audited consolidated financial statements. Certain items in the prior period financial statements have been reclassified to conform to the current presentation. These reclassifications had no effect on prior year net income or shareholders’ equity.

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments in this ASU, among other things, require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, the ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit

deterioration. The FASB has issued multiple updates to ASU 2016-13 as codified in Topic 326, including ASUs 2019-04, 2019-05, 2019-10, 2019-11, 2020-02, and 2020-03. These ASUs have provided for various minor technical corrections and improvements to the codification as well as other transition matters. Smaller reporting companies who file with the U.S. Securities and Exchange Commission (“SEC”) and all other entities who do not file with the SEC are required to apply the guidance for fiscal years, and interim periods within those years, beginning after December 15, 2022. As part of the Company’s implementation efforts, we have engaged a third-party vendor, reconciled historical loan, charge-off and recovery data and determined segmentation of the loan portfolio for application of the current expected credit losses calculation. The Company is currently in the process of designing calculation methodologies under the new guidance and quantifying the approximate impact on the Company’s financial position and results of operation. We have engaged an external vendor to assist with model validation.

In March 2022, the FASB issued ASU No. 2022-02, “Financial Instruments-Credit Losses (Topic 326), Troubled Debt Restructurings and Vintage Disclosures.” ASU 2022-02 addresses areas identified by the FASB as part of its post-implementation review of the credit losses standard (ASU 2016-13) that introduced the CECL model. The amendments eliminate the accounting guidance for troubled debt restructurings by creditors that have adopted the CECL model and enhance the disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. In addition, the amendments require a public business entity to disclose current-period gross write-offs for financing receivables and net investment in leases by year of origination in the vintage disclosures. The amendments in this ASU should be applied prospectively, except for the transition method related to the recognition and measurement of TDRs, where an entity has the option to apply a modified retrospective transition method resulting in a cumulative-effect adjustment to retained earnings in the period of adoption. For entities that have not yet adopted ASU 2016-13 (such as the Company), the effective dates for the provisions of ASU 2022-02 are the same as the effective dates in ASU 2016-13. Early adoption is permitted if an entity has adopted ASU 2016-13; however, the Company does not expect to adopt ASU 2016-13 in advance of the required implementation date. The Company is currently assessing the impact that ASU 2022-02 will have on its consolidated financial statements.

In March 2020, the FASB issued ASU No. 2020-04 “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” These amendments provide temporary optional guidance to ease the potential burden in accounting for reference rate reform. The ASU provides optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued. It is intended to help stakeholders during the global market-wide reference rate transition period. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. Subsequently, in January 2021, the FASB issued ASU No. 2021-01 “Reference Rate Reform (Topic 848): Scope.” This ASU clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the transition. The ASU also amends the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition. An entity may elect to apply ASU No. 2021-01 on contract modifications that change the interest rate used for margining, discounting, or contract price alignment retrospectively as of any date from the beginning of the interim period that includes March 12, 2020, or prospectively to new modifications from any date within the interim period that includes or is subsequent to January 7, 2021, up to the date that financial statements are available to be issued. An entity may elect to apply ASU No. 2021-01 to eligible hedging relationships existing as of the beginning of the interim period that includes March 12, 2020, and to new eligible hedging relationships entered into after the beginning of the interim period that includes March 12, 2020. As of March 31, 2022, the Company did not have any loans indexed to LIBOR. Subject to market conditions, the Company intends to refinance its subordinated debt in July 2022 when it becomes callable and converts to a floating rate note indexed to LIBOR