Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying unaudited consolidated financial statements and notes thereto of the Company have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three months and nine months ended September 30, 2020 are not necessarily indicative of the results for the full year. These interim unaudited financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2019, included in our Annual Report filed on Form 10-K for the fiscal year ended December 31, 2019 (our “2019 Annual Report”).
Use of Estimates, Policy [Policy Text Block]	Use of Estimates in the Preparation of Financial Statements The preparation of 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 financial statements and the reported amounts of revenues and expenses during the reporting period. It is reasonably possible our estimate of the allowance for loan losses and the fair value of mortgage servicing rights could change as actual results could differ from those estimates. Actual results could differ from those estimates.
Summary of Significant Accounting Policies [Policy Text Block]	Summary of Significant Accounting Policies The accompanying unaudited consolidated financial statements were compiled in accordance with the accounting policies set forth in Note 2 – Basis of Presentation and Summary of Significant Policies in our Consolidated Financial Statements as of and for the year ended December 31, 2019, included in our 2019 Annual Report. The Financial Accounting Standards Board ("FASB") issues Accounting Standards Updates ("ASU" or “Update”) and Accounting Standards Codifications (“ASC”), which are the primary source of GAAP.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements When RBB conducted its initial public offering (“IPO”) in 2017, we qualified as an emerging growth company (“EGC”). We will remain an EGC until the earliest of (i) the end of the fiscal year during which we have total annual gross revenues of $1.0 billion or more, (ii) the end of the fiscal year following the fifth anniversary of the completion of our IPO, (iii) the date on which we have, during the previous three-year period, issued more than $1.0 billion in non-convertible debt and (iv) the date on which we are deemed to be a “large accelerated filer” under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). We anticipate no longer qualifying as an EGC on December 31, 2022. EGCs are entitled to reduced regulatory and reporting requirements under the Securities Act of 1933, as amended (the “Securities Act”), and the Exchange Act, as compared to public business entities ("PBE"). In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), including subsequent amending ASUs. The most significant change for lessees is the requirement under the new guidance to recognize right-of-use assets and lease liabilities for all leases not considered short-term leases, which is generally defined as a lease term of less than 12 months. This change will result in lessees recognizing right-of-use assets and lease liabilities for most leases currently accounted for as operating leases under current lease accounting guidance. As amended by ASU 2020-05, this ASU is effective for an EGC for fiscal years beginning after December 15, 2021, and for interim periods within fiscal years beginning after December 15, 2022. The Company has several lease agreements which are currently considered operating leases and are therefore not included on the Company’s Consolidated Balance Sheets. Under the new guidance the Company expects that some of the lease agreements will be recognized on the Consolidated Balance Sheets as a right-of-use asset with a corresponding lease liability. Based upon a preliminary evaluation, the Company expects that the ASU will have an impact on the Company’s Consolidated Balance Sheets. As of this Quarterly Report and the Company’s current leases, we estimate the right-of-use asset and lease liability will be in the range of $25-30 million as of the expected December 31, 2022 EGC adoption date. The effective date for this ASU for PBEs is for years beginning after December 15, 2018, and for interim periods within those fiscal years. The Company will continue to evaluate how extensive the impact will be under the ASU on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instrument (Topic 326), including subsequent amending ASUs. This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model. The new model, referred to as the current expected credit loss ("CECL") model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held to maturity securities, loan commitments, and financial guarantees. For available for sale (“AFS”) debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity's assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, public business entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU 2016-13 was originally proposed to be effective for interim and annual reporting periods for an emerging growth company beginning after December 15, 2020 (however, see below). Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company has begun its evaluation of the impact of the implementation of ASU 2016-13. The implementation of the provisions of ASU 2016-13 will most likely impact the Company’s consolidated financial statements as to the level of reserves that will be required for credit losses. The Company will continue to assess the potential impact that this Update will have on the Company’s consolidated financial statements. The Company will adopt CECL (ASU 2016-13) on December 31, 2022. In February 2019, the U.S. federal bank regulatory agencies approved a final rule modifying their regulatory capital rules and providing an option to phase in over a three year period the day-one adverse regulatory capital effects of ASU 2016-13. Additionally, in March 2020, the U.S. federal bank regulatory agencies issued an interim final rule that provides banking organizations an option to delay the estimated CECL impact on regulatory capital for an additional two years for a total transition period of up to five years to provide regulatory relief to banking organizations to better focus on supporting lending to creditworthy households and businesses in light of recent strains on the U.S. economy as a result of the novel coronavirus disease 2019 ("COVID-19") pandemic. As a result, entities will have the option to gradually phase in the full effect of CECL on regulatory capital over a five-year transition period. In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350). This Update simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this Update are required for public business entities and other entities that have goodwill reported in their financial statements and have not elected the private company alternative for the subsequent measurement of goodwill. As a result, under this Update, “an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.” For PBE's, ASU 2017-04 is effective for annual and any interim impairment tests performed in periods beginning after December 15, 2019. As an EGC, the Company will adopt this ASU on December 31, 2022. Adoption of ASU 2017-04 is not expected to have a significant impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which is intended to enhance “the accounting for the amortization of premiums for purchased callable debt securities.” This Update shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this Update affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). The amendment does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU’s amendments are effective for EGC’s for interim periods beginning after December 15, 2020 and annual periods beginning after December 15, 2019. An entity should apply the amendments in this Update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Additionally, in the period of adoption, an entity should provide disclosures about a change in accounting principle. The implementation of the provisions of ASU 2017-08 will most likely not have a material impact the Company’s consolidated financial statements. The Company will continue to assess the potential impact that this ASU will have on the Company’s consolidated financial statements. In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The amendments in this Update expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost (that is, the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. For EGCs, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. This Update has the potential to only impact share-based payments to members of the Company’s non-employees. The Company adopted this ASU on January 1, 2020 and this ASU did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this Update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. These disclosure requirements were removed from the topic: (1) The amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (2) the policy for timing of transfers between levels, and (3) the valuation processes for Level 3 fair value measurements. These disclosure requirements were modified: (1) For investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse only if the investee has communicated the timing to the entity or announced the timing publicly, and (2) the amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. The following disclosure requirements were added: (1) The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements. In addition, the amendments eliminate “at a minimum” from the phrase “an entity shall disclose at a minimum to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures and to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements”. The amendments in this Update are effective for EGCs for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. As an EGC, the Company adopted this Update on January 1, 2020 and it did not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This Update provides additional guidance to ASU 2015-05, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” (CCA), on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) apply to entities that are a customer in a hosting arrangement. This Update applies to entities that are a customer in a hosting arrangement that is a service contract. Costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. This Update also requires the customer to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This Update is effective for an EGC for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption of the amendments in this Update is permitted, including adoption in any interim period, for all entities. The amendments in this Update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. This Update will most likely not have a material impact unless the Company incurs implementation costs for a CCA that is a service contract. In November 2019, the FASB issued ASU 2019-08, Compensation—Stock Compensation (Topic 718) and Revenue from Contracts with Customers (Topic 606), Codification Improvements—Share-Based Consideration Payable to a Customer. This ASU will affect companies that issue share-based payments (e.g., options or warrants) to their customers. In June 2018, the FASB issued ASU 2018-07 that expanded the scope of Topic 718, Compensation—Stock Compensation, to include share-based payments to non-employees in exchange for goods and services. That ASU substantially aligned the accounting for share-based payments to non-employees and employees. However, it required share-based payments to nonemployee customers to be accounted for under Topic 606, Revenue from Contracts with Customers, as a reduction of revenue, similar to other sales incentives (such as coupons and rebates). While that ASU provided guidance on the income statement classification of payments to customers (as a reduction of revenue), that ASU did not specify when to measure such awards or how to classify awards on the balance sheet (for example as a liability or as equity). To address diversity in these areas, the new guidance requires companies to measure and classify (on the balance sheet) share-based payments to customers by applying the guidance in Topic 718. As a result, the amount recorded as a reduction in revenue would be measured based on the grant-date fair value of the share-based payment. ASU 2019-08 is effective for entities that have not yet adopted the amendments in ASU 2018-07, the amendments in ASU 2019-08 are effective for an EGC in fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company adopted the ASU as of December 31, 2019 and this ASU did not have a material impact on the Company’s financial statements as the Company has not issued share-based payments to non-employees, except for non-employee members of the board of directors. In January 2020, the FASB issued ASU 2020-01, “Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)”. This ASU is for equity securities accounted for by the equity method. The amendment clarifies that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. The Company has equity securities on our balance sheet but are not material to be considered for the equity method. For an EGC, this ASU is effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. In February 2020, the FASB issued ASU 2020-02, “Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842)—Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) (SEC Update)”. This is an amendment to add the SEC Staff guidance on CECL) to the FASB codification. It contains guidance on what the SEC would expect the Company to perform and document when measuring and recording its allowance for credit losses for financial assets recorded at amortized cost. As an EGC, the Company will implement CECL on December 31, 2022. In March 2020, the FASB issued ASU 2020-03, “Codification Improvements to Financial Instruments”. The ASU clarifies the accounting and disclosure guidance in various codification topics for financial instruments. In particular, the amendments (1) clarify certain disclosure requirements, including fair value option disclosures, (2) add cross-references in U.S. GAAP to clarify certain guidance, (3) make clear the applicability of the portfolio exception in ASC 820, Fair Value Measurement, to nonfinancial items, (4) clarify the determination of the contractual life of a net investment in leases in estimating expected credit losses under ASC 326, Financial Instruments – Credit Losses, and (5) explain the interaction between the guidance in ASC 860-20, Transfers and Servicing: Sales of Financial Assets, and ASC 326. For RBB as an EGC, issues 1, 2, 4 and 5 are applicable for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years beginning after December 15, 2020. The amendment related to Issue 3 is a conforming amendment that affects the guidance in the amendments in ASU 2019-04. We are currently evaluating this guidance to determine the financial impact on the Company’s consolidated financial statements. In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting," which provides temporary optional expedients to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (“LIBOR”) to an alternative reference rate such as Secured Overnight Financing Rate (“SOFR”). This pronouncement is applicable to all companies with contracts or hedging relationships that reference an interest rate that is expected to be discontinued. The ASU provides companies with optional guidance to ease the potential accounting burden associated with transitioning away from reference rates that are expected to be discontinued. Companies can apply the ASU immediately. However, the guidance will only be available for a limited time (generally through December 31, 2022). For contract modifications, companies can account for the modification as a continuation of the existing contract without additional analysis. For held-to-maturity (“HTM”) debt securities, one-time sale and/or transfer to available-for-sale or trading may be made for HTM debt securities that both reference an eligible reference rate and were classified as HTM before January 1, 2020. Regarding the effective date and transition: (1) companies can apply the ASU as of the beginning of the interim period that includes March 12, 2020 (e.g. January 1, 2020 for calendar year-end companies) or any date thereafter, (2) the ASU applies prospectively to contract modifications and hedging relationships, and (3) the one-time election to sell and/or transfer debt securities classified as HTM may be made at any time after March 12, 2020. The optional relief generally does not apply to contract modifications made, sales and transfers of HTM debt securities, and hedging relationships entered into or evaluated after December 31, 2022. The guidance was effective upon issuance and generally can be applied through December 31, 2022. Of the Company’s $2.8 billion in total gross loans as of September 30, 2020, approximately 15% have a LIBOR based reference rate. The Company has several issuances of LIBOR based long-term debt and subordinated debentures. Refer to Notes 9 and 10 of the Company’s consolidated financial statements included in this Form 10-Q. We are currently evaluating this guidance to determine the financial impact on the Company’s consolidated financial statements. In June 2020, the FASB issued ASU 2020-05, “Revenue from Contracts with Customers (Topic 606) and Leases (Topic 842): Effective Dates for Certain Entities”. This ASU allows for the deferral of the effective dates of ASC 606 and ASC 842 (including amendments issued after the issuance of the original Update) to provide immediate, near-term relief for certain entities for whom these Updates are either currently effective or imminently effective. The Company has already implemented Topic 606 and will implement topic 842 on January 1, 2022.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2020

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The accompanying unaudited consolidated financial statements and notes thereto of the Company have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q and conform to practices within the banking industry and include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for interim financial reporting. The accompanying unaudited consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments), which are necessary for a fair presentation of financial results for the interim periods presented. The results of operations for the three months and nine months ended September 30, 2020 are not necessarily indicative of the results for the full year. These interim unaudited financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto as of and for the year ended December 31, 2019, included in our Annual Report filed on Form 10-K for the fiscal year ended December 31, 2019 (our “2019 Annual Report”).

Use of Estimates, Policy [Policy Text Block]

Use of Estimates in the Preparation of Financial Statements

The preparation of 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 financial statements and the reported amounts of revenues and expenses during the reporting period. It is reasonably possible our estimate of the allowance for loan losses and the fair value of mortgage servicing rights could change as actual results could differ from those estimates. Actual results could differ from those estimates.

Summary of Significant Accounting Policies [Policy Text Block]

Summary of Significant Accounting Policies

The accompanying unaudited consolidated financial statements were compiled in accordance with the accounting policies set forth in Note 2 – Basis of Presentation and Summary of Significant Policies in our Consolidated Financial Statements as of and for the year ended December 31, 2019, included in our 2019 Annual Report. The Financial Accounting Standards Board ("FASB") issues Accounting Standards Updates ("ASU" or “Update”) and Accounting Standards Codifications (“ASC”), which are the primary source of GAAP.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

When RBB conducted its initial public offering (“IPO”) in 2017, we qualified as an emerging growth company (“EGC”). We will remain an EGC until the earliest of (i) the end of the fiscal year during which we have total annual gross revenues of $1.0 billion or more, (ii) the end of the fiscal year following the fifth anniversary of the completion of our IPO, (iii) the date on which we have, during the previous three-year period, issued more than $1.0 billion in non-convertible debt and (iv) the date on which we are deemed to be a “large accelerated filer” under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). We anticipate no longer qualifying as an EGC on December 31, 2022. EGCs are entitled to reduced regulatory and reporting requirements under the Securities Act of 1933, as amended (the “Securities Act”), and the Exchange Act, as compared to public business entities ("PBE").

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), including subsequent amending ASUs. The most significant change for lessees is the requirement under the new guidance to recognize right-of-use assets and lease liabilities for all leases not considered short-term leases, which is generally defined as a lease term of less than 12 months. This change will result in lessees recognizing right-of-use assets and lease liabilities for most leases currently accounted for as operating leases under current lease accounting guidance. As amended by ASU 2020-05, this ASU is effective for an EGC for fiscal years beginning after December 15, 2021, and for interim periods within fiscal years beginning after December 15, 2022. The Company has several lease agreements which are currently considered operating leases and are therefore not included on the Company’s Consolidated Balance Sheets. Under the new guidance the Company expects that some of the lease agreements will be recognized on the Consolidated Balance Sheets as a right-of-use asset with a corresponding lease liability. Based upon a preliminary evaluation, the Company expects that the ASU will have an impact on the Company’s Consolidated Balance Sheets. As of this Quarterly Report and the Company’s current leases, we estimate the right-of-use asset and lease liability will be in the range of $25-30 million as of the expected December 31, 2022 EGC adoption date. The effective date for this ASU for PBEs is for years beginning after December 15, 2018, and for interim periods within those fiscal years. The Company will continue to evaluate how extensive the impact will be under the ASU on the Company’s consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instrument (Topic 326), including subsequent amending ASUs. This ASU significantly changes how entities will measure credit losses for most financial assets and certain other instruments that aren't measured at fair value through net income. The standard will replace today's "incurred loss" approach with an "expected loss" model. The new model, referred to as the current expected credit loss ("CECL") model, will apply to: (1) financial assets subject to credit losses and measured at amortized cost, and (2) certain off-balance sheet credit exposures. This includes, but is not limited to, loans, leases, held to maturity securities, loan commitments, and financial guarantees. For available for sale (“AFS”) debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity's assumptions, models, and methods for estimating the allowance for loan and lease losses. In addition, public business entities will need to disclose the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination. ASU 2016-13 was originally proposed to be effective for interim and annual reporting periods for an emerging growth company beginning after December 15, 2020 (however, see below). Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (i.e., modified retrospective approach). The Company has begun its evaluation of the impact of the implementation of ASU 2016-13. The implementation of the provisions of ASU 2016-13 will most likely impact the Company’s consolidated financial statements as to the level of reserves that will be required for credit losses. The Company will continue to assess the potential impact that this Update will have on the Company’s consolidated financial statements. The Company will adopt CECL (ASU 2016-13) on December 31, 2022.

In February 2019, the U.S. federal bank regulatory agencies approved a final rule modifying their regulatory capital rules and providing an option to phase in over a three year period the day-one adverse regulatory capital effects of ASU 2016-13. Additionally, in March 2020, the U.S. federal bank regulatory agencies issued an interim final rule that provides banking organizations an option to delay the estimated CECL impact on regulatory capital for an additional two years for a total transition period of up to five years to provide regulatory relief to banking organizations to better focus on supporting lending to creditworthy households and businesses in light of recent strains on the U.S. economy as a result of the novel coronavirus disease 2019 ("COVID-19") pandemic. As a result, entities will have the option to gradually phase in the full effect of CECL on regulatory capital over a five-year transition period.

In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350). This Update simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The amendments in this Update are required for public business entities and other entities that have goodwill reported in their financial statements and have not elected the private company alternative for the subsequent measurement of goodwill. As a result, under this Update, “an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.” For PBE's, ASU 2017-04 is effective for annual and any interim impairment tests performed in periods beginning after December 15, 2019. As an EGC, the Company will adopt this ASU on December 31, 2022. Adoption of ASU 2017-04 is not expected to have a significant impact on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities, which is intended to enhance “the accounting for the amortization of premiums for purchased callable debt securities.” This Update shortens the amortization period for certain callable debt securities purchased at a premium by requiring that the premium be amortized to the earliest call date. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this Update affects all entities that hold investments in callable debt securities that have an amortized cost basis in excess of the amount that is repayable by the issuer at the earliest call date (that is, at a premium). The amendment does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The ASU’s amendments are effective for EGC’s for interim periods beginning after December 15, 2020 and annual periods beginning after December 15, 2019. An entity should apply the amendments in this Update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Additionally, in the period of adoption, an entity should provide disclosures about a change in accounting principle. The implementation of the provisions of ASU 2017-08 will most likely not have a material impact the Company’s consolidated financial statements. The Company will continue to assess the potential impact that this ASU will have on the Company’s consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting. The amendments in this Update expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. An entity should apply the requirements of Topic 718 to nonemployee awards except for specific guidance on inputs to an option pricing model and the attribution of cost (that is, the period of time over which share-based payment awards vest and the pattern of cost recognition over that period). The amendments specify that Topic 718 applies to all share-based payment transactions in which a grantor acquires goods or services to be used or consumed in a grantor’s own operations by issuing share-based payment awards. The amendments also clarify that Topic 718 does not apply to share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or services to customers as part of a contract accounted for under Topic 606, Revenue from Contracts with Customers. For EGCs, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. This Update has the potential to only impact share-based payments to members of the Company’s non-employees. The Company adopted this ASU on January 1, 2020 and this ASU did not have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this Update modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. These disclosure requirements were removed from the topic: (1) The amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (2) the policy for timing of transfers between levels, and (3) the valuation processes for Level 3 fair value measurements. These disclosure requirements were modified: (1) For investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date when restrictions from redemption might lapse only if the investee has communicated the timing to the entity or announced the timing publicly, and (2) the amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. The following disclosure requirements were added: (1) The changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. For certain unobservable inputs, an entity may disclose other quantitative information (such as the median or arithmetic average) in lieu of the weighted average if the entity determines that other quantitative information would be a more reasonable and rational method to reflect the distribution of unobservable inputs used to develop Level 3 fair value measurements. In addition, the amendments eliminate “at a minimum” from the phrase “an entity shall disclose at a minimum to promote the appropriate exercise of discretion by entities when considering fair value measurement disclosures and to clarify that materiality is an appropriate consideration of entities and their auditors when evaluating disclosure requirements”. The amendments in this Update are effective for EGCs for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. As an EGC, the Company adopted this Update on January 1, 2020 and it did not have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This Update provides additional guidance to ASU 2015-05, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” (CCA), on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) apply to entities that are a customer in a hosting arrangement. This Update applies to entities that are a customer in a hosting arrangement that is a service contract. Costs for implementation activities in the application development stage are capitalized depending on the nature of the costs, while costs incurred during the preliminary project and post-implementation stages are expensed as the activities are performed. This Update also requires the customer to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This Update is effective for an EGC for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption of the amendments in this Update is permitted, including adoption in any interim period, for all entities. The amendments in this Update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. This Update will most likely not have a material impact unless the Company incurs implementation costs for a CCA that is a service contract.

In November 2019, the FASB issued ASU 2019-08, Compensation—Stock Compensation (Topic 718) and Revenue from Contracts with Customers (Topic 606), Codification Improvements—Share-Based Consideration Payable to a Customer. This ASU will affect companies that issue share-based payments (e.g., options or warrants) to their customers. In June 2018, the FASB issued ASU 2018-07 that expanded the scope of Topic 718, Compensation—Stock Compensation, to include share-based payments to non-employees in exchange for goods and services. That ASU substantially aligned the accounting for share-based payments to non-employees and employees. However, it required share-based payments to nonemployee customers to be accounted for under Topic 606, Revenue from Contracts with Customers, as a reduction of revenue, similar to other sales incentives (such as coupons and rebates). While that ASU provided guidance on the income statement classification of payments to customers (as a reduction of revenue), that ASU did not specify when to measure such awards or how to classify awards on the balance sheet (for example as a liability or as equity). To address diversity in these areas, the new guidance requires companies to measure and classify (on the balance sheet) share-based payments to customers by applying the guidance in Topic 718. As a result, the amount recorded as a reduction in revenue would be measured based on the grant-date fair value of the share-based payment. ASU 2019-08 is effective for entities that have not yet adopted the amendments in ASU 2018-07, the amendments in ASU 2019-08 are effective for an EGC in fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company adopted the ASU as of December 31, 2019 and this ASU did not have a material impact on the Company’s financial statements as the Company has not issued share-based payments to non-employees, except for non-employee members of the board of directors.

In January 2020, the FASB issued ASU 2020-01, “Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)”. This ASU is for equity securities accounted for by the equity method. The amendment clarifies that an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. The Company has equity securities on our balance sheet but are not material to be considered for the equity method. For an EGC, this ASU is effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years.

In February 2020, the FASB issued ASU 2020-02, “Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842)—Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) (SEC Update)”. This is an amendment to add the SEC Staff guidance on CECL) to the FASB codification. It contains guidance on what the SEC would expect the Company to perform and document when measuring and recording its allowance for credit losses for financial assets recorded at amortized cost. As an EGC, the Company will implement CECL on December 31, 2022.

In March 2020, the FASB issued ASU 2020-03, “Codification Improvements to Financial Instruments”. The ASU clarifies the accounting and disclosure guidance in various codification topics for financial instruments. In particular, the amendments (1) clarify certain disclosure requirements, including fair value option disclosures, (2) add cross-references in U.S. GAAP to clarify certain guidance, (3) make clear the applicability of the portfolio exception in ASC 820, Fair Value Measurement, to nonfinancial items, (4) clarify the determination of the contractual life of a net investment in leases in estimating expected credit losses under ASC 326, Financial Instruments – Credit Losses, and (5) explain the interaction between the guidance in ASC 860-20, Transfers and Servicing: Sales of Financial Assets, and ASC 326. For RBB as an EGC, issues 1, 2, 4 and 5 are applicable for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years beginning after December 15, 2020. The amendment related to Issue 3 is a conforming amendment that affects the guidance in the amendments in ASU 2019-04. We are currently evaluating this guidance to determine the financial impact on the Company’s consolidated financial statements.

In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting," which provides temporary optional expedients to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (“LIBOR”) to an alternative reference rate such as Secured Overnight Financing Rate (“SOFR”). This pronouncement is applicable to all companies with contracts or hedging relationships that reference an interest rate that is expected to be discontinued. The ASU provides companies with optional guidance to ease the potential accounting burden associated with transitioning away from reference rates that are expected to be discontinued. Companies can apply the ASU immediately. However, the guidance will only be available for a limited time (generally through December 31, 2022). For contract modifications, companies can account for the modification as a continuation of the existing contract without additional analysis. For held-to-maturity (“HTM”) debt securities, one-time sale and/or transfer to available-for-sale or trading may be made for HTM debt securities that both reference an eligible reference rate and were classified as HTM before January 1, 2020. Regarding the effective date and transition: (1) companies can apply the ASU as of the beginning of the interim period that includes March 12, 2020 (e.g. January 1, 2020 for calendar year-end companies) or any date thereafter, (2) the ASU applies prospectively to contract modifications and hedging relationships, and (3) the one-time election to sell and/or transfer debt securities classified as HTM may be made at any time after March 12, 2020. The optional relief generally does not apply to contract modifications made, sales and transfers of HTM debt securities, and hedging relationships entered into or evaluated after December 31, 2022. The guidance was effective upon issuance and generally can be applied through December 31, 2022. Of the Company’s $2.8 billion in total gross loans as of September 30, 2020, approximately 15% have a LIBOR based reference rate. The Company has several issuances of LIBOR based long-term debt and subordinated debentures. Refer to Notes 9 and 10 of the Company’s consolidated financial statements included in this Form 10-Q. We are currently evaluating this guidance to determine the financial impact on the Company’s consolidated financial statements.

In June 2020, the FASB issued ASU 2020-05, “Revenue from Contracts with Customers (Topic 606) and Leases (Topic 842): Effective Dates for Certain Entities”. This ASU allows for the deferral of the effective dates of ASC 606 and ASC 842 (including amendments issued after the issuance of the original Update) to provide immediate, near-term relief for certain entities for whom these Updates are either currently effective or imminently effective. The Company has already implemented Topic 606 and will implement topic 842 on January 1, 2022.