BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations California BanCorp is a California corporation incorporated on October 2, 2019 and is registered with the Board of Governors of the Federal Reserve System as a bank holding company for California Bank of Commerce, N.A. under the Bank Holding Company Act of 1956, as amended. On May 15, 2020, the Company completed a reorganization whereby the Bank became a wholly-owned subsidiary of the Company. California Bank of Commerce, N.A. began business operations in December 2001 under the name Ramona National Bank. The Bank changed its name to First Business Bank, N.A. in 2006, to Bank of Southern California, N.A. in 2010, and to California Bank of Commerce, N.A. on July 31, 2024. The Bank has a wholly-owned subsidiary, BCAL OREO1, LLC, which was formed on February 14, 2024. BCAL OREO1, LLC is used for holding other real estate owned and other assets acquired by foreclosure. The Bank operates under a federal charter and its primary regulator is the Office of the Comptroller of the Currency (“OCC”). The words “we,” “us,” “our,” or the “Company” refer to California BanCorp and California Bank of Commerce, N.A. collectively and on a consolidated basis. References herein to “California BanCorp,” or the “holding company” refer to California BanCorp on a stand-alone basis. References to the “Bank” refer to California Bank of Commerce, N.A. As a relationship-focused community bank, the Bank offers a range of financial products and services to individuals, professionals, and small- to medium-sized businesses through its 14 branch offices serving California. Many of the banking offices have been acquired through a number of acquisitions. The Company's common stock trades on the Nasdaq Capital Market under the symbol "BCAL". Merger with California BanCorp On January 30, 2024, the Company announced the execution of a definitive merger agreement with the CALB, the holding company for California Bank of Commerce, pursuant to which CALB would merge into the Company in an all-stock merger. The Merger received all required regulatory approvals on May 13, 2024, shareholder approvals on July 17, 2024 and closed on July 31, 2024. Refer to Note 2 - Business Combinations for additional information. The Company retained the banking offices of both banks, adding CALB’s one full-service bank branch and its four loan production offices in Northern California to the Bank’s 13 full-service bank branches located throughout the Southern California region. Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared pursuant to Article 10 of SEC Regulation S-X and other SEC rules and regulations for reporting on the Quarterly Report on Form 10-Q. Accordingly, certain disclosures required by U.S. generally accepted accounting principles (“GAAP”) are not included herein. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. In the opinion of management of the Company, the accompanying unaudited interim consolidated financial statements reflect all of the adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of the consolidated financial condition and consolidated results of operations as of the dates and for the periods presented. The results of operations for the three months ended March 31, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. Principles of Consolidation The consolidated financial statements include the accounts of the Company, including its wholly owned subsidiary, the Bank and the Bank’s wholly-owned subsidiary, BCAL OREO1, LLC. All significant intercompany balances and transactions have been eliminated in consolidation. Use of Estimates in the Preparation of Consolidated Financial Statements The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the 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 are the determination of the allowance for credit losses, the fair value of assets and liabilities acquired in business combinations and related purchase price allocation, the valuation of acquired loans, the valuation of goodwill and separately identifiable intangible assets associated with mergers and acquisitions, loan sales and servicing of financial assets and deferred tax assets and liabilities. Operating Segments We operate one reportable segment — commercial banking. The Company has one reporting unit, one operating segment and, consequently, a single reportable segment. The Company’s chief operating decision maker (“CODM”) is a role shared by four executive officers, the Executive Chairman, Chief Executive Officer, President, and Chief Financial Officer. The Company’s CODM monitors revenue streams and other information regarding the products and services offered through the Company’s banking operations. The information provided to the CODM is presented on an aggregated single segment level basis, which is consistent with the accompanying consolidated financial statements presented in this Quarterly Report on Form 10-Q. The CODM evaluates the financial performance of the Company’s business by evaluating revenue streams, significant expenses, and comparing budgeted to actual results in assessing operating results and in allocating resources, with profitability only determined at a single segment level. The CODM uses revenue streams to evaluate product pricing and significant expenses to assess performance and evaluate return on assets. The CODM uses consolidated net income to benchmark the Company against its competitors. The benchmarking analysis, coupled with the monitoring of budgeted to actual results, is used in assessing performance and allocating resources. Loans, investments, and deposits provide the revenues from the Company's operations. Interest expense, provisions for credit losses, salaries and benefits, and occupancy expenses represent the significant expenses in the Company's operations. All of the Company's income and expenses are included in the accompanying consolidated statements of income presented in this Quarterly Report on Form 10-Q. All of the Company’s operations are domestic. The Company’s assets are reflected in the accompanying consolidated balance sheet as “total assets.” Recently Adopted Accounting Guidance In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures to require, among other things, that a public entity that has a single reportable segment provide enhanced disclosures about significant segment expenses. Significant expense categories are derived from expenses that are (1) regularly reported to an entity’s CODM, and (2) included in a segment’s reported measure of profit or loss. The disclosures should include an amount for "other segment items," reflecting the difference between (1) segment revenue less significant segment expenses, and (2) the reportable segment’s profit or loss measures. It requires that a public entity disclose the title and position of the CODM and how the CODM uses the reported measure of profit or loss to assess segment performance and to allocate resources. Further it clarifies that entities with a single reportable segment must disclose both new and existing segment reporting requirements. The ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. A public entity should apply the amendments retrospectively to all periods presented in the financial statements. The adoption of ASU 2023-07 did not have a significant impact on the consolidated financial statements. On January 1, 2025, the Company adopted ASU No. 2023-09, Income Taxes (Topic 740) – Improvements to Income Tax Disclosures. This standard addresses requests for improved income tax disclosures from investors, lenders, creditors and other allocators of capital that use the financial statements to make capital allocation decisions. This ASU is intended to improve the transparency of tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction, in addition to certain other amendments intended to improve the effectiveness of income tax disclosures. The adoption of ASU 2023-09 did not have a material impact on the consolidated financial statements. Significant Accounting Policies The accounting and reporting policies of the Company are based upon GAAP and conform to predominant practices within the banking industry. We have not made any changes in our significant accounting policies from those disclosed in Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024. Allowance for Credit Losses — Held-to-Maturity Debt Securities An ACL is established for losses on held-to-maturity debt securities at the time of purchase or designation and is updated each period to reflect management’s expectations of current expected credit losses (“CECL”) as of the date of the consolidated balance sheets. The ACL is estimated collectively for groups of debt securities with similar risk characteristics, and is determined at the individual security level when the Company deems a security to no longer possess shared risk characteristics. Accrued interest receivable on held-to-maturity debt securities is excluded from the estimate of credit losses. For debt securities where the Company has reason to believe the credit loss exposure is remote, a zero credit loss assumption is applied. Such debt securities were municipal securities, and historically have had limited credit loss experience. The Company does not anticipate any credit related losses in this investment portfolio. Changes in the ACL on held-to-maturity debt securities are recorded as a component of the provision for (reversal of) credit losses in the consolidated statements of operations. Losses are charged against the ACL when management believes the uncollectibility of a held-to-maturity debt security is confirmed. Allowance for Credit Losses — Available-for-Sale Debt Securities For available-for-sale debt securities, the Company evaluates, on an individual basis, whether a decline in fair value below the amortized cost basis has resulted from a credit loss or other factors. The portion of the decline attributable to credit losses is recognized through an ACL, and changes in the ACL on available-for-sale debt securities are recorded as a component of the provision for (reversal of) credit losses in the consolidated statements of operations. The portion of decline in fair value below the amortized cost basis not attributable to credit is recognized through other comprehensive income (loss), net of applicable taxes. Allowance for Credit Losses — Acquired Debt Securities The Company has acquired debt securities through merger or acquisitions. To the extent acquired debt securities have more than insignificant credit deterioration since origination, they are designated as purchased credit-deteriorated (“PCD”) securities. An ACL is determined using the same methodology as with other debt securities. The sum of a PCD security’s fair value and associated ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the debt security is a noncredit discount or premium, which is amortized into interest income over the life of the security. Subsequent changes to the ACL are recorded through provision for credit losses. Allowance for Credit Losses — Loans An ACL is the Company’s estimate of expected lifetime credit losses for its loans held for investment at the time of origination or acquisition and is maintained at a level deemed appropriate by management to provide for expected lifetime credit losses in the portfolio. The ACL consists of: (i) a specific allowance established for current expected credit losses on loans individually evaluated, (ii) a quantitative allowance for current expected credit losses based on the portfolio and expected economic conditions over a reasonable and supportable forecast period that reverts back to long-term trends to cover the expected life of the loan, (iii) a qualitative allowance including management judgment to capture factors and trends that are not adequately reflected in the quantitative allowance, and (iv) the ACL for off-balance sheet credit exposure for unfunded loan commitments (described in Allowance for Credit Losses - Off-Balance Sheet Credit Exposure). The ACL on loans held for investment represents the portion of the loans’ amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loans’ contractual life. Amortized cost does not include accrued interest, which management elected to exclude from the estimate of expected credit losses. Provision for credit losses for loans held for investment is included in provision for (reversal of) credit losses in the consolidated statements of operations. Loan charge-offs are recognized when management believes the collectability of the principal balance outstanding is unlikely. Subsequent recoveries, if any, are credited to the ACL. Credit losses are not estimated for accrued interest receivable as interest that is deemed uncollectible is written off through interest income. Estimating expected credit losses requires management to use relevant forward-looking information, including the use of reasonable and supportable forecasts. Pools of loans with similar risk characteristics are collectively evaluated while loans that no longer share risk characteristics with loan pools are evaluated individually. The Company measures the ACL using a discounted cash flow methodology, which utilizes pool-level assumptions and cash flow projections on an individual loan basis, which is then aggregated at the portfolio segment level and supplemented by a qualitative reserve that is applied to each portfolio segment level. The Company’s loan portfolio consists of the following segments, based on regulatory call codes and related risk ratings: Construction and land development loans are typically adjustable rate residential and commercial construction loans to builders, developers and consumers, with terms generally limited to 12 to 36 months. These loans generally require payment in full upon the sale or refinance of the property. Construction and development loans generally carry a higher degree of risk because repayment depends on the ultimate completion of the project and usually on the subsequent sale or refinance of the property, unless the project is user-owned which would then convert to a conventional term loan. Specific material risks may include (i) unforeseen delays in the building of the project, (ii) cost overruns or inadequate contingency reserves, (iii) poor management of construction process, (iv) inferior or improper construction techniques, (v) changes in the economic environment during the construction period, (vi) a downturn in the real estate market, (vii) rising interest rates which may impact the sale of the property and its price, and (viii) failure to sell or stabilize completed projects in a timely manner. The Company attempts to reduce risks associated with construction and land development loans by obtaining personal guarantees and by keeping the maximum loan-to-value (“LTV”) ratio at or below 75%, depending on the project type. Many of the construction and land development loans include interest reserves built into the loan commitment. For owner-occupied commercial construction loans, periodic cash payments for interest are required from the borrower’s cash flow. Real estate loans are secured by single family residential properties (one to four units), multifamily residential properties (five or more units), owner-occupied commercial real estate (“CRE”), and non-owner occupied CRE. Real estate loans are subject to the same general risks as other loans and may also be impacted by changing demographics, collateral maintenance, and product supply and demand. Rising interest rates, as well as other factors arising after a loan has been made, could negatively affect not only property values but also a borrower’s cash flow, creditworthiness, and ability to repay the loan. Increasing interest rates can impact real estate values as rising rates generally cause a similar movement in capitalization rates which can cause real estate collateral values to decline. The Company usually obtains a security interest in real estate, in addition to any other available collateral, in order to increase the likelihood of the ultimate repayment of the loan. The Company does not underwrite closed-end term consumer loans secured by a borrower’s residence. Junior liens may be considered in connection with a consumer home equity line of credit (“HELOC”), or as additional collateral support for SBA and other business loans. The Company’s commercial and industrial (“C&I”) loans are generally made to businesses located in the Southern and Northern California regions and surrounding communities. These loans are made to finance operations, to provide working capital, or for specific purposes such as to finance the purchase of assets or equipment or to finance accounts receivable and inventory. The Company’s C&I loans may be secured (other than by real estate) or unsecured. They may take the form of single payment, installment, or lines of credit. These are generally based on the financial strength and integrity of the borrower and guarantor(s) and generally (with some exceptions) are collateralized by short-term assets such as accounts receivable, inventory, equipment, or a borrower’s other business assets. Commercial term loans are typically made to provide working capital to finance the acquisition of fixed assets, refinance short-term debt originally used to purchase fixed assets or, in rare cases, to finance the purchase of businesses. Consumer loans consist of loans to individuals for personal and household purposes, including secured and unsecured installment loans and revolving lines of credit. The Company acquired consumer solar loans from the Merger. These loans were originated and serviced by unaffiliated third parties. The remaining average term ranges from 6 to 23 years. Consumer loans are underwritten based on the borrower’s income, current debt level, past credit history, and the availability and value of collateral. Consumer rates are both fixed and variable, with negotiable terms. The Company’s installment loans typically amortize over periods up to 5 years. Although the Company typically requires monthly payments of interest and a portion of the principal on its loan products, the Company will offer consumer loans with a single maturity date when a specific source of repayment is available. Consumer loans are generally considered to have greater risk than first or second mortgages on real estate because they may be unsecured, or, if they are secured, the value of the collateral may be difficult to assess and more likely to decrease in value than real estate. The Company’s ACL model incorporates assumptions for prepayment/curtailment rates, probability of default (“PD”), and loss given default (“LGD”) to project each loan’s cash flow throughout its entire life cycle. An initial reserve amount is determined based on the difference between the amortized cost basis of each loan and the present value of all future cash flows. The initial reserve amount is then aggregated at the loan segment level to derive the segment level quantitative loss rates. For prepayment and curtailment rates, the Company utilized Abrigo’s benchmark since the adoption on January 1, 2023 through the second quarter of 2023 and switched to the Company’s own historical prepayment and curtailment experience beginning in the third quarter of 2023. Quarterly PD is forecasted using a regression model that incorporates certain economic variables as inputs. The LGD is derived from PD using the Frye-Jacobs index provided by the Company’s third-party model provider. Reasonable and supportable forecasts are used to predict current and future economic conditions. Management elected to use a four quarter reasonable and supportable forecast period followed by an eight quarter straight-line reversion period. After twelve quarters of forecast plus reversion period, the PD is assumed to remain unchanged for the remaining life of the loan. The Company uses numerous key macroeconomic variables within the economic forecast scenarios from Moody’s Analytics. These economic forecast scenarios are based on past events, current conditions, and the likelihood of future events occurring. These scenarios include a baseline forecast which represents their best estimate of future economic activity. Moody’s Analytics also provides nine alternative scenarios, including five direct variations of the baseline scenario and four more extensive departures from their baseline forecast, including a slower growth, a stagflation, a next cycle recession and a low oil price scenario. Management recognizes the non-linearity of credit losses relative to economic performance and believes the use of multiple probability-weighted economic scenarios is appropriate in estimating credit losses over the forecast period. This approach is based on certain assumptions. The first assumption is that no single forecast of the economy, however detailed or complex, is completely accurate over a reasonable forecast timeframe and is subject to revisions over time. By considering multiple scenarios, management believes some of the uncertainty associated with a single scenario approach can be mitigated. Management periodically evaluates economic scenarios, determines whether to utilize multiple probability-weighted scenarios in the Company’s ACL model, and, if multiple scenarios are utilized, evaluates and determines the weighting for each scenario used in the Company’s ACL model, and thus the scenarios and weightings of each scenario may change in future periods. Economic scenarios as well as assumptions within those scenarios can vary based on changes in current and expected economic conditions. The ACL process involves subjective and complex judgments and is reflective of significant uncertainties that could potentially result in materially different results under different assumptions and conditions. In addition to the aforementioned quantitative model, management periodically considers the need for qualitative adjustments to the ACL. Such qualitative adjustments may be related to and include, but are not limited to factors such as: differences in segment-specific risk characteristics, periods wherein current conditions and reasonable and supportable forecasts of economic conditions differ from the conditions that existed at the time of the estimated loss calculation, model limitations and management’s overall assessment of the adequacy of the ACL. Qualitative risk factors are periodically evaluated by management. Generally, the measurement of the ACL is performed by collectively evaluating loans with similar risk characteristics. Loans that do not share similar risk characteristics are evaluated individually for credit loss and are not included in the evaluation process discussed above. Expected credit losses on all individually evaluated loans are measured, primarily through the evaluation of estimated cash flows expected to be collected, or collateral values measured by reference to an observable market value, if one exists, or the fair value of the collateral for a collateral-dependent loan. The Company selects the measurement method on a loan-by-loan basis except that collateral-dependent loans for which foreclosure is probable are measured at the net realizable value of the collateral. Cash receipts on individually evaluated loans for which the accrual of interest has been discontinued are applied first to principal and then to interest income. Amounts are charged-off when available information confirms that specific loans or portions thereof, are uncollectible. This methodology for determining charge-offs is consistently applied to each loan segment. Loans with terms that have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are evaluated for an ACL utilizing one of the methodologies above. Allowance for Credit Losses — Acquired Loans In accordance with ASU 2016-13, Measurement of Credit Losses on Financial Instruments (Topic 326), loans purchased or acquired in connection with a business combination are recorded at their acquisition date fair value. Any resulting discount or premium recorded on acquired loans is accreted or amortized into interest income over the remaining life of the loans using the interest method. The ACL related to the acquired loan portfolio is not carried over from the acquiree. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”). PCD loans are those loans or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. For PCD loans, an initial allowance is established on the acquisition date using the same methodology as other loans held for investment and combined with the fair value of the loan to arrive at acquisition date amortized cost. Accordingly, no provision for credit losses is recognized on PCD loans at the acquisition date. Subsequent to the acquisition date, changes to the allowance are recognized in the provision for (reversal of) credit losses. Non-PCD loans are those loans for which there was no evidence of a more-than-insignificant credit deterioration at their acquisition date. Acquired non‑PCD loans, together with originated loans held for investment that share similar risk characteristics, are pooled into segments together. Upon the purchase or acquisition of non-PCD loans, the Company measures and records an ACL based on the Company’s methodology for determining the ACL for its originated loans held for investment. The ACL for non-PCD loans is recorded through a charge to the provision for (reversal of) credit losses in the period in which the loans were purchased or acquired. Allowance for Credit Losses — Off-Balance Sheet Credit Exposures The Company also maintains a separate allowance for off-balance sheet commitments. Beginning January 1, 2023, management estimates anticipated losses using expected loss factors consistent with those used for the ACL methodology for loans described above, and utilization assumptions based on historical experience. Provision for credit losses for off-balance sheet commitments is included in provision for (reversal of) credit losses in the consolidated statements of operations and added to the allowance for off-balance sheet commitments, which is included in accrued interest payable and other liabilities in the consolidated balance sheets. Loan Modifications, Refinancings and Restructurings Prior to the adoption of ASU 2022-02, a loan was classified as a troubled debt restructuring (“TDR”) when the Company granted a concession to a borrower experiencing financial difficulties that it otherwise would not consider under its normal lending policies under ASC Subtopic 310-40, Troubled Debt Restructurings by Creditors. Upon the adoption of ASU 2022-02, the Company applies the general loan modification guidance provided in ASC 310-20 to all loan modifications, including modifications made for borrowers experiencing financial difficulty. The Company considers some of the indicators that a borrower is experiencing financial difficulty to be: currently in payment default on any of their debt, declaring bankruptcy, having issues continuing as a going concern, insufficient cash flow to service all debt service requirements, inability to obtain funds from other sources at a market rate for similar debt to non-troubled borrowers, and currently classified as substandard loans that are categorized as having well-defined weaknesses. Under the general loan modification guidance, a modification is treated as a new loan only if the following two conditions are met: (1) the terms of the new loan are at least as favorable to the Company as the terms for comparable loans to other customers with similar collection risks; and (2) modifications to the terms of the original loan are more than minor. If either condition is not met, the modification is accounted for as the continuation of the existing loan with any effect of the modification treated as a prospective adjustment to the loan’s effective interest rate. If the refinancing or restructuring is deemed to be a new loan, unamortized net fees or costs from the original loan and any prepayment penalties are recognized in interest income when the new loan is granted. In addition, a new effective interest rate will be determined. If the refinancing or restructuring is deemed to be a modification, the investment in the new loan is comprised of the remaining net investment in the original loan, any additional funds advanced to the borrower, any fees received, and direct loan origination costs associated with the refinancing or restructuring. The effective interest rate of the loan is recalculated based upon the amortized cost basis of the new loan and its revised contractual cash flows. A modification may vary by program and by borrower-specific characteristics, that may include interest rate reductions, principal forgiveness, term extensions, payment delays and any combination of the above. It is intended to minimize the Company’s economic loss and to avoid foreclosure or repossession of collateral. The Company applies the same credit loss methodology it uses for similar loans that were not modified. GAAP requires that certain types of modifications be reported, which consist of (1) principal forgiveness; (2) interest rate reduction; (3) other-than-insignificant payment delay; (4) term extension; and any combination of the above. Recent Accounting Guidance Not Yet Effective In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements–Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative (“ASU 2023-06”). The amendments in this update modify the disclosure or presentation requirements for a variety of topics in the codification. Certain amendments represent clarifications to or technical corrections of the current requirements. The following is a summary of the topics included in the update and which pertain to the Company: 1. Statement of cash flows (Topic 230): Requires an accounting policy disclosure in annual periods of where cash flows associated with derivative instruments and their related gains and losses are presented in the statement of cash flows; 2. Accounting changes and error corrections (Topic 250): Requires that when there has been a change in the reporting entity, the entity disclose any material prior-period adjustment and the effect of the adjustment on retained earnings in interim financial statements; 3. Earnings per share (Topic 260): Requires disclosure of the methods used in the diluted earnings-per-share computation for each dilutive security and clarifies that certain disclosures should be made during interim periods, and amends illustrative guidance to illustrate disclosure of the methods used in the diluted earnings per share computation; 4. Commitments (Topic 440): Requires disclosure of assets mortgaged, pledged, or otherwise subject to lien and the obligations collateralized; and 5. Debt (Topic 470): Requires disclosure of amounts and terms of unused lines of credit and unfunded commitments and the weighted- average interest rate on outstanding short-term borrowings. For public business entities, the amendments in ASU 2023-06 are effective on the date which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. If by June 30, 2027, the SEC has not removed the applicable requirement from Regulation and S-X or Regulation S-K, the pending content of the related amendment will be removed from the codification and will not become effective for any entity. Early adoption is not permitted and the amendments are required to be applied on a prospective basis. The Company expects the adoption of this standard will not have a material impact on its consolidated financial statements. ASU No. 2024-03, Income Statement– Reporting Comprehensive Income-Expense Disaggregation Disclosures. In November 2024, the FASB issued ASU 2024-03 which requires disclosure in the notes to the financial statements of specified information about certain costs and expenses. In January 2025, the FASB issued ASU 2025-01, Income Statement—Reporting Comprehensive Income– Expense Disaggregation Disclosures– Clarifying the Effective Date, which amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU 2024-03 is permitted. The Company expects the adoption of this standard will not have a material impact on its consolidated financial statements.

California BanCorp is a California corporation incorporated on October 2, 2019 and is registered with the Board of Governors of the Federal Reserve System as a bank holding company for California Bank of Commerce, N.A. under the Bank Holding Company Act of 1956, as amended. On May 15, 2020, the Company completed a reorganization whereby the Bank became a wholly-owned subsidiary of the Company. California Bank of Commerce, N.A. began business operations in December 2001 under the name Ramona National Bank. The Bank changed its name to First Business Bank, N.A. in 2006, to Bank of Southern California, N.A. in 2010, and to California Bank of Commerce, N.A. on July 31, 2024. The Bank has a wholly-owned subsidiary, BCAL OREO1, LLC, which was formed on February 14, 2024. BCAL OREO1, LLC is used for holding other real estate owned and other assets acquired by foreclosure. The Bank operates under a federal charter and its primary regulator is the Office of the Comptroller of the Currency (“OCC”). The words “we,” “us,” “our,” or the “Company” refer to California BanCorp and California Bank of Commerce, N.A. collectively and on a consolidated basis. References herein to “California BanCorp,” or the “holding company” refer to California BanCorp on a stand-alone basis. References to the “Bank” refer to California Bank of Commerce, N.A.

On January 30, 2024, the Company announced the execution of a definitive merger agreement with the CALB, the holding company for California Bank of Commerce, pursuant to which CALB would merge into the Company in an all-stock merger. The Merger received all required regulatory approvals on May 13, 2024, shareholder approvals on July 17, 2024 and closed on July 31, 2024. Refer to Note 2 - Business Combinations for additional information. The Company retained the banking offices of both banks, adding CALB’s one full-service bank branch and its four loan production offices in Northern California to the Bank’s 13 full-service bank branches located throughout the Southern California region.

The accompanying unaudited interim consolidated financial statements have been prepared pursuant to Article 10 of SEC Regulation S-X and other SEC rules and regulations for reporting on the Quarterly Report on Form 10-Q. Accordingly, certain disclosures required by U.S. generally accepted accounting principles (“GAAP”) are not included herein. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in Item 8. Financial Statements and Supplementary Data of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024.

In the opinion of management of the Company, the accompanying unaudited interim consolidated financial statements reflect all of the adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of the consolidated financial condition and consolidated results of operations as of the dates and for the periods presented. The results of operations for the three months ended March 31, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025.

expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change are the determination of the allowance for credit losses, the fair value of assets and liabilities acquired in business combinations and related purchase price allocation, the valuation of acquired loans, the valuation of goodwill and separately identifiable intangible assets associated with mergers and acquisitions, loan sales and servicing of financial assets and deferred tax assets and liabilities.

We operate one reportable segment — commercial banking. The Company has one reporting unit, one operating segment and, consequently, a single reportable segment. The Company’s chief operating decision maker (“CODM”) is a role shared by four executive officers, the Executive Chairman, Chief Executive Officer, President, and Chief Financial Officer. The Company’s CODM monitors revenue streams and other information regarding the products and services offered through the Company’s banking operations. The information provided to the CODM is presented on an aggregated single segment level basis, which is consistent with the accompanying consolidated financial statements presented in this Quarterly Report on Form 10-Q. The CODM evaluates the financial performance of the Company’s business by evaluating revenue streams, significant expenses, and comparing budgeted to actual results in assessing operating results and in allocating resources, with profitability only determined at a single segment level. The CODM uses revenue streams to evaluate product pricing and significant expenses to assess performance and evaluate return on assets. The CODM uses consolidated net income to benchmark the Company against its competitors. The benchmarking analysis, coupled with the monitoring of budgeted to actual results, is used in assessing performance and allocating resources. Loans, investments, and deposits provide the revenues from the Company's operations. Interest expense, provisions for credit losses, salaries and benefits, and occupancy expenses represent the significant expenses in the Company's operations. All of the Company's income and expenses are included in the accompanying consolidated statements of income presented in this Quarterly Report on Form 10-Q. All of the Company’s operations are domestic. The Company’s assets are reflected in the accompanying consolidated balance sheet as “total assets.”

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2023-07 Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures to require, among other things, that a public entity that has a single reportable segment provide enhanced disclosures about significant segment expenses. Significant expense categories are derived from expenses that are (1) regularly reported to an entity’s CODM, and (2) included in a segment’s reported measure of profit or loss. The disclosures should include an amount for "other segment items," reflecting the difference between (1) segment revenue less significant segment expenses, and (2) the reportable segment’s profit or loss measures. It requires that a public entity disclose the title and position of the CODM and how the CODM uses the reported measure of profit or loss to assess segment performance and to allocate resources. Further it clarifies that entities with a single reportable segment must disclose both new and existing segment reporting requirements. The ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. A public entity should apply the amendments retrospectively to all periods presented in the financial statements. The adoption of ASU 2023-07 did not have a significant impact on the consolidated financial statements.

On January 1, 2025, the Company adopted ASU No. 2023-09, Income Taxes (Topic 740) – Improvements to Income Tax Disclosures. This standard addresses requests for improved income tax disclosures from investors, lenders, creditors and other allocators of capital that use the financial statements to make capital allocation decisions. This ASU is intended to improve the transparency of tax disclosures by requiring (1)

An ACL is established for losses on held-to-maturity debt securities at the time of purchase or designation and is updated each period to reflect management’s expectations of current expected credit losses (“CECL”) as of the date of the consolidated balance sheets. The ACL is estimated collectively for groups of debt securities with similar risk characteristics, and is determined at the individual security level when the Company deems a security to no longer possess shared risk characteristics. Accrued interest receivable on held-to-maturity debt securities is excluded from the estimate of credit losses. For debt securities where the Company has reason to believe the credit loss exposure is remote, a zero credit loss assumption is applied. Such debt securities were municipal securities, and historically have had limited credit loss experience. The Company does not anticipate any credit related losses in this investment portfolio. Changes in the ACL on held-to-maturity debt securities are recorded as a component of the provision for (reversal of) credit losses in the consolidated statements of operations. Losses are charged against the ACL when management believes the uncollectibility of a held-to-maturity debt security is confirmed.

For available-for-sale debt securities, the Company evaluates, on an individual basis, whether a decline in fair value below the amortized cost basis has resulted from a credit loss or other factors. The portion of the decline attributable to credit losses is recognized through an ACL, and changes in the ACL on available-for-sale debt securities are recorded as a component of the provision for (reversal of) credit losses in the consolidated statements of operations. The portion of decline in fair value below the amortized cost basis not attributable to credit is recognized through other comprehensive income (loss), net of applicable taxes.

The Company has acquired debt securities through merger or acquisitions. To the extent acquired debt securities have more than insignificant credit deterioration since origination, they are designated as purchased credit-deteriorated (“PCD”) securities. An ACL is determined using the same methodology as with other debt securities. The sum of a PCD security’s fair value and associated ACL becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the debt security is a noncredit discount or premium, which is amortized into interest income over the life of the security. Subsequent changes to the ACL are recorded through provision for credit losses.

An ACL is the Company’s estimate of expected lifetime credit losses for its loans held for investment at the time of origination or acquisition and is maintained at a level deemed appropriate by management to provide for expected lifetime credit losses in the portfolio. The ACL consists of: (i) a specific allowance established for current expected credit losses on loans individually evaluated, (ii) a quantitative allowance for current expected credit losses based on the portfolio and expected economic conditions over a reasonable and supportable forecast period that reverts back to long-term trends to cover the expected life of the loan, (iii) a qualitative allowance including management judgment to capture factors and trends that are not adequately reflected in the quantitative

The ACL on loans held for investment represents the portion of the loans’ amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loans’ contractual life. Amortized cost does not include accrued interest, which management elected to exclude from the estimate of expected credit losses. Provision for credit losses for loans held for investment is included in provision for (reversal of) credit losses in the consolidated statements of operations. Loan charge-offs are recognized when management believes the collectability of the principal balance outstanding is unlikely. Subsequent recoveries, if any, are credited to the ACL. Credit losses are not estimated for accrued interest receivable as interest that is deemed uncollectible is written off through interest income.

Estimating expected credit losses requires management to use relevant forward-looking information, including the use of reasonable and supportable forecasts. Pools of loans with similar risk characteristics are collectively evaluated while loans that no longer share risk characteristics with loan pools are evaluated individually. The Company measures the ACL using a discounted cash flow methodology, which utilizes pool-level assumptions and cash flow projections on an individual loan basis, which is then aggregated at the portfolio segment level and supplemented by a qualitative reserve that is applied to each portfolio segment level.

Construction and land development loans are typically adjustable rate residential and commercial construction loans to builders, developers and consumers, with terms generally limited to 12 to 36 months. These loans generally require payment in full upon the sale or refinance of the property. Construction and development loans generally carry a higher degree of risk because repayment depends on the ultimate completion of the project and usually on the subsequent sale or refinance of the property, unless the project is user-owned which would then convert to a conventional term loan. Specific material risks may include (i) unforeseen delays in the building of the project, (ii) cost overruns or inadequate contingency reserves, (iii) poor management of construction process, (iv) inferior or improper construction techniques, (v) changes in the economic environment during the construction period, (vi) a downturn in the real estate market, (vii) rising interest rates which may impact the sale of the property and its price, and (viii) failure to sell or stabilize completed projects in a timely manner. The Company attempts to reduce risks associated with construction and land development loans by obtaining personal guarantees and by keeping the maximum loan-to-value (“LTV”) ratio at or below 75%, depending on the project type. Many of the construction and land development loans include interest reserves built into the loan commitment. For owner-occupied commercial construction loans, periodic cash payments for interest are required from the borrower’s cash flow.

Real estate loans are secured by single family residential properties (one to four units), multifamily residential properties (five or more units), owner-occupied commercial real estate (“CRE”), and non-owner occupied CRE. Real estate loans are subject to the same general risks as other loans and may also be impacted by changing demographics, collateral maintenance, and product supply and demand. Rising interest rates, as well as other factors arising after a loan has been made, could negatively affect not only property values but also a borrower’s cash flow, creditworthiness, and ability to repay the loan. Increasing interest rates can impact real estate values as rising rates generally cause a similar movement in capitalization rates which can cause real estate collateral values to decline. The Company usually obtains a security interest in real estate, in addition to any other available collateral, in order to increase the likelihood of the ultimate repayment of the loan. The Company does not underwrite closed-end term consumer loans secured by a borrower’s residence. Junior liens may be considered in connection with a consumer home equity line of credit (“HELOC”), or as additional collateral support for SBA and other business loans.

The Company’s commercial and industrial (“C&I”) loans are generally made to businesses located in the Southern and Northern California regions and surrounding communities. These loans are made to finance operations, to provide working capital, or for specific purposes such as to finance the purchase of assets or equipment or to finance accounts receivable and inventory. The Company’s C&I loans may be secured (other than

by real estate) or unsecured. They may take the form of single payment, installment, or lines of credit. These are generally based on the financial strength and integrity of the borrower and guarantor(s) and generally (with some exceptions) are collateralized by short-term assets such as accounts receivable, inventory, equipment, or a borrower’s other business assets. Commercial term loans are typically made to provide working capital to finance the acquisition of fixed assets, refinance short-term debt originally used to purchase fixed assets or, in rare cases, to finance the purchase of businesses.

Consumer loans consist of loans to individuals for personal and household purposes, including secured and unsecured installment loans and revolving lines of credit. The Company acquired consumer solar loans from the Merger. These loans were originated and serviced by unaffiliated third parties. The remaining average term ranges from 6 to 23 years. Consumer loans are underwritten based on the borrower’s income, current debt level, past credit history, and the availability and value of collateral. Consumer rates are both fixed and variable, with negotiable terms. The Company’s installment loans typically amortize over periods up to 5 years. Although the Company typically requires monthly payments of interest and a portion of the principal on its loan products, the Company will offer consumer loans with a single maturity date when a specific source of repayment is available. Consumer loans are generally considered to have greater risk than first or second mortgages on real estate because they may be unsecured, or, if they are secured, the value of the collateral may be difficult to assess and more likely to decrease in value than real estate.

The Company’s ACL model incorporates assumptions for prepayment/curtailment rates, probability of default (“PD”), and loss given default (“LGD”) to project each loan’s cash flow throughout its entire life cycle. An initial reserve amount is determined based on the difference between the amortized cost basis of each loan and the present value of all future cash flows. The initial reserve amount is then aggregated at the loan segment level to derive the segment level quantitative loss rates. For prepayment and curtailment rates, the Company utilized Abrigo’s benchmark since the adoption on January 1, 2023 through the second quarter of 2023 and switched to the Company’s own historical prepayment and curtailment experience beginning in the third quarter of 2023. Quarterly PD is forecasted using a regression model that incorporates certain economic variables as inputs. The LGD is derived from PD using the Frye-Jacobs index provided by the Company’s third-party model provider. Reasonable and supportable forecasts are used to predict current and future economic conditions. Management elected to use a four quarter reasonable and supportable forecast period followed by an eight quarter straight-line reversion period. After twelve quarters of forecast plus reversion period, the PD is assumed to remain unchanged for the remaining life of the loan.

The Company uses numerous key macroeconomic variables within the economic forecast scenarios from Moody’s Analytics. These economic forecast scenarios are based on past events, current conditions, and the likelihood of future events occurring. These scenarios include a baseline forecast which represents their best estimate of future economic activity. Moody’s Analytics also provides nine alternative scenarios, including five direct variations of the baseline scenario and four more extensive departures from their baseline forecast, including a slower growth, a stagflation, a next cycle recession and a low oil price scenario. Management recognizes the non-linearity of credit losses relative to economic performance and believes the use of multiple probability-weighted economic scenarios is appropriate in estimating credit losses over the forecast period. This approach is based on certain assumptions. The first assumption is that no single forecast of the economy, however detailed or complex, is completely accurate over a reasonable forecast timeframe and is subject to revisions over time. By considering multiple scenarios, management believes some of the uncertainty associated with a single scenario approach can be mitigated. Management periodically evaluates economic scenarios, determines whether to utilize multiple probability-weighted scenarios in the Company’s ACL model, and, if multiple scenarios are utilized, evaluates and determines the weighting for each scenario used in the Company’s ACL model, and thus the scenarios and weightings of each scenario may change in future periods. Economic scenarios as well as assumptions within those scenarios can vary based on changes in current and expected economic conditions.

The ACL process involves subjective and complex judgments and is reflective of significant uncertainties that could potentially result in materially different results under different assumptions and conditions. In addition to the aforementioned quantitative model, management periodically considers the need for qualitative adjustments to the ACL. Such qualitative adjustments may be related to and include, but are not limited to factors such as:

differences in segment-specific risk characteristics, periods wherein current conditions and reasonable and supportable forecasts of economic conditions differ from the conditions that existed at the time of the estimated loss calculation, model limitations and management’s overall assessment of the adequacy of the ACL. Qualitative risk factors are periodically evaluated by management.

Generally, the measurement of the ACL is performed by collectively evaluating loans with similar risk characteristics. Loans that do not share similar risk characteristics are evaluated individually for credit loss and are not included in the evaluation process discussed above. Expected credit losses on all individually evaluated loans are measured, primarily through the evaluation of estimated cash flows expected to be collected, or collateral values measured by reference to an observable market value, if one exists, or the fair value of the collateral for a collateral-dependent loan. The Company selects the measurement method on a loan-by-loan basis except that collateral-dependent loans for which foreclosure is probable are measured at the net realizable value of the collateral. Cash receipts on individually evaluated loans for which the accrual of interest has been discontinued are applied first to principal and then to interest income. Amounts are charged-off when available information confirms that specific loans or portions thereof, are uncollectible. This methodology for determining charge-offs is consistently applied to each loan segment.

In accordance with ASU 2016-13, Measurement of Credit Losses on Financial Instruments (Topic 326), loans purchased or acquired in connection with a business combination are recorded at their acquisition date fair value. Any resulting discount or premium recorded on acquired loans is accreted or amortized into interest income over the remaining life of the loans using the interest method. The ACL related to the acquired loan portfolio is not carried over from the acquiree. Acquired loans are classified into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (“PCD”) loans, or loans with no evidence of credit deterioration (“non-PCD”).

PCD loans are those loans or pool of loans that have experienced more-than-insignificant credit deterioration since the origination date. For PCD loans, an initial allowance is established on the acquisition date using the same methodology as other loans held for investment and combined with the fair value of the loan to arrive at acquisition date amortized cost. Accordingly, no provision for credit losses is recognized on PCD loans at the acquisition date. Subsequent to the acquisition date, changes to the allowance are recognized in the provision for (reversal of) credit losses.

Non-PCD loans are those loans for which there was no evidence of a more-than-insignificant credit deterioration at their acquisition date. Acquired non‑PCD loans, together with originated loans held for investment that share similar risk characteristics, are pooled into segments together. Upon the purchase or acquisition of non-PCD loans, the Company measures and records an ACL based on the Company’s methodology for determining the ACL for its originated loans held for investment. The ACL for non-PCD loans is recorded through a charge to the provision for (reversal of) credit losses in the period in which the loans were purchased or acquired.

The Company also maintains a separate allowance for off-balance sheet commitments. Beginning January 1, 2023, management estimates anticipated losses using expected loss factors consistent with those used for the ACL methodology for loans described above, and utilization assumptions based on historical experience. Provision for credit losses for off-balance sheet commitments is included in provision for (reversal of) credit

Prior to the adoption of ASU 2022-02, a loan was classified as a troubled debt restructuring (“TDR”) when the Company granted a concession to a borrower experiencing financial difficulties that it otherwise would not consider under its normal lending policies under ASC Subtopic 310-40, Troubled Debt Restructurings by Creditors. Upon the adoption of ASU 2022-02, the Company applies the general loan modification guidance provided in ASC 310-20 to all loan modifications, including modifications made for borrowers experiencing financial difficulty. The Company considers some of the indicators that a borrower is experiencing financial difficulty to be: currently in payment default on any of their debt, declaring bankruptcy, having issues continuing as a going concern, insufficient cash flow to service all debt service requirements, inability to obtain funds from other sources at a market rate for similar debt to non-troubled borrowers, and currently classified as substandard loans that are categorized as having well-defined weaknesses.

Under the general loan modification guidance, a modification is treated as a new loan only if the following two conditions are met: (1) the terms of the new loan are at least as favorable to the Company as the terms for comparable loans to other customers with similar collection risks; and (2) modifications to the terms of the original loan are more than minor. If either condition is not met, the modification is accounted for as the continuation of the existing loan with any effect of the modification treated as a prospective adjustment to the loan’s effective interest rate. If the refinancing or restructuring is deemed to be a new loan, unamortized net fees or costs from the original loan and any prepayment penalties are recognized in interest income when the new loan is granted. In addition, a new effective interest rate will be determined. If the refinancing or restructuring is deemed to be a modification, the investment in the new loan is comprised of the remaining net investment in the original loan, any additional funds advanced to the borrower, any fees received, and direct loan origination costs associated with the refinancing or restructuring. The effective interest rate of the loan is recalculated based upon the amortized cost basis of the new loan and its revised contractual cash flows.

A modification may vary by program and by borrower-specific characteristics, that may include interest rate reductions, principal forgiveness, term extensions, payment delays and any combination of the above. It is intended to minimize the Company’s economic loss and to avoid foreclosure or repossession of collateral. The Company applies the same credit loss methodology it uses for similar loans that were not modified.

In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements–Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative (“ASU 2023-06”). The amendments in this update modify the disclosure or presentation requirements for a variety of topics in the codification. Certain amendments represent clarifications to or technical corrections of the current requirements. The following is a summary of the topics included in the update and which pertain to the Company: 1. Statement of cash flows (Topic 230): Requires an accounting policy disclosure in annual periods of where cash flows associated with derivative instruments and their related gains and losses are presented in the statement of cash flows; 2. Accounting changes and error corrections (Topic 250): Requires that when there has been a change in the reporting entity, the entity disclose any material prior-period adjustment and the effect of the adjustment on retained earnings in interim financial statements; 3. Earnings per share (Topic 260): Requires disclosure of the methods used in the diluted earnings-per-share computation for each dilutive security and clarifies that certain disclosures should be made during interim periods, and amends illustrative guidance to illustrate disclosure of the methods used in the diluted earnings per share computation; 4. Commitments (Topic 440): Requires disclosure of assets mortgaged, pledged, or otherwise subject to lien and the obligations collateralized; and 5. Debt (Topic 470): Requires disclosure of amounts and terms of unused lines of credit and unfunded commitments and the weighted-

average interest rate on outstanding short-term borrowings. For public business entities, the amendments in ASU 2023-06 are effective on the date which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. If by June 30, 2027, the SEC has not removed the applicable requirement from Regulation and S-X or Regulation S-K, the pending content of the related amendment will be removed from the codification and will not become effective for any entity. Early adoption is not permitted and the amendments are required to be applied on a prospective basis. The Company expects the adoption of this standard will not have a material impact on its consolidated financial statements.

ASU No. 2024-03, Income Statement– Reporting Comprehensive Income-Expense Disaggregation Disclosures. In November 2024, the FASB issued ASU 2024-03 which requires disclosure in the notes to the financial statements of specified information about certain costs and expenses. In January 2025, the FASB issued ASU 2025-01, Income Statement—Reporting Comprehensive Income– Expense Disaggregation Disclosures– Clarifying the Effective Date, which amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU 2024-03 is permitted. The Company expects the adoption of this standard will not have a material impact on its consolidated financial statements.