Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	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 interim periods 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, 2017, included in the Companys’ registration statement on Form S-1 (333-223444) filed with the SEC on March 5, 2018 and declared effective on March 27, 2018.
Use of Estimates	Use of Estimates: To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ.
Concentration of Risk	Concentration of Risk: Most of the Company’s customers are located within Los Angeles County and the surrounding area. The concentration of loans originated in this area may subject the Company to the risk of adverse impacts of economic, regulatory or other developments that could occur in Southern California. The Company has significant concentration in commercial real estate loans. The Company obtains what it believes to be sufficient collateral to secure potential losses. The extent and value of the collateral obtained varies based upon the details underlying each loan agreement.
Cash Flows	Cash Flows: Cash and cash equivalents include cash, deposits with other financial institutions with original maturities less than 90 days, and federal funds sold. Net cash flows are reported for customer loan and deposit transactions and Federal Home Loan Bank advances transactions.
Securities	Securities: Securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Securities are classified as available for sale when they might be sold before maturity. Securities available for sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of tax. Interest income includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. Management evaluates securities for other-than-temporary impairment (“OTTI”) on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement, and 2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis.
Other investments	Other investments: Other investments includes the followings : (i) Federal Home Loan Bank (“FHLB”) Stock - the Bank is a member of the FHLB system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income; (ii) Pacific Coast Bankers Bank (“PCBB”) Stock - the Bank is a member of PCBB. PCBB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on ultimate recovery of par value. Both cash and stock dividends are reported as income; and (iii) the Company’s investment in a mutual fund to satisfy the Company’s requirements under the Community Reinvestment Act (“CRA”). CRA mutual fund is reported at fair value. Unrealized gains and losses are recognized in other income in the Consolidated Statements of Income and Comprehensive Income.
Loans Held for Sale	Loans Held for Sale: Certain Small Business Administration (“SBA”) loans that may be sold prior to maturity are designated as held for sale at origination and are recorded at the lower of their cost or fair value less costs to sell, determined on an aggregate basis. A valuation allowance is established if the market value of such loans is lower than their cost, and operations are charged or credited for valuation adjustments. Origination fees on loans held for sale, net of certain costs of processing and closing the loans, are deferred until the time of sale and are included in the computation of the gain or loss from the sales of the related loans. A portion of the premium on sale of SBA loans is recognized as gains on sales of loans at the time of the sale. These loans are generally sold with servicing retained.
Loans Receivable	Loans Receivable: Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of deferred loan fees and costs and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. The recorded investment in loans includes accrued interest receivable, deferred loan fees and costs, and unearned income. The accrual of interest income on commercial real estate and other commercial and industrial loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Consumer loans are typically charged off no later than 120 days past due. Past due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans and loans past due 90 days still on accrual include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. All interest accrued but not received for loans placed on nonaccrual status is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Allowance for Loan Losses	Allowance for Loan Losses: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that in management’s judgment should be charged off. The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. A loan is impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Company determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan-by-loan basis for commercial real estate and construction loans. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Income recognition on impaired loans materially conforms to the method the Company uses for income recognition on nonaccrual loans. Allowance for impaired loans is determined based on the present value of the estimated cash flows or on the fair value of the collateral if the loan is collateral dependent, less costs to sell. If the measured fair value is less than the recorded investment in the loan, the deficiency will be charged off against the allowance for loan losses, or alternatively, a specific allocation will be established. For consumer loans, management will generally charge off the balance if the loan is 90 days or more past due. The general component of the allowance covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent two years. For those portfolio segments that the Company does not have sufficient historical data available to track the loss migration, the loss factors are based on the actual loss history experienced by the Company over the most recent five years. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations.. The following portfolio segments have been identified in the Company’s loan portfolio, and are also representative of the classes within the portfolio: commercial real estate, SBA loans—real estate, SBA loans—non-real estate, commercial and industrial, home mortgage, and consumer. The Company reviews the credit risk exposure of all its portfolio segments by internally assigned grades. The Company categorizes loans into risk grades based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. For the home mortgage and consumer portfolio segments, the Company’s primary monitoring tool is reviewing past due listings to determine if the loans are performing. The determination of the allowance for loan losses is based on estimates that are particularly susceptible to changes in the economic environment and market conditions. Management believes that as of September 30, 2018 and December 31, 2017 the allowance for loan losses is adequate based on information currently available. If a deterioration in the economy of the Company’s principal market area occurs, the Company’s loan portfolios could be adversely impacted and higher charge-offs and increases in non-performing assets could result. Such an adverse impact could also require a larger allowance for loan losses.
Servicing Assets	Servicing Assets: When SBA loans are sold with servicing retained, servicing assets are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, prepayment speeds, and default rates and losses. The Company compares the valuation model inputs and results to published industry data in order to validate the model results and assumptions. Servicing assets are subsequently measured using the amortization method which requires servicing assets to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Servicing assets are evaluated for impairment based upon the fair value of the assets as compared to their carrying amount. Impairment is recognized through a valuation allowance to the extent that fair value is less than the carrying amount. If the Company later determines that all or a portion of the impairment no longer exists, a reduction of the valuation allowance may be recorded as an increase to income. Changes in the valuation allowances are reported with other income on the income statement. The fair values of servicing rights are subject to fluctuations as a result of changes in estimated and actual prepayment speeds, default rates, and losses. Servicing fee income, which is reported on the income statement as other income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal and are recorded as income when earned. The amortization of servicing assets is netted against loan servicing fee income. Late fees and ancillary fees related to loan servicing are not material.
Company Owned Life Insurance	Company Owned Life Insurance: The Company has purchased life insurance policies on certain key executives. Company owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Transfers of Financial Assets	Transfers of Financial Assets: Transfers of financial assets are accounted for as sales when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Premises and Equipment	Premises and Equipment: Premises and equipment are stated at cost, less accumulated depreciation. Equipment and furnishings are depreciated over 3 to 10 years, and leasehold improvements are amortized over the lesser of the terms of the respective leases or the estimated useful lives. The straight-line method of depreciation is used for financial reporting purposes. Repairs and maintenance are charged to operating expenses as incurred.
Other Real Estate Owned, Net	Other Real Estate Owned, Net: Assets acquired through or instead of loan foreclosure are initially recorded at fair value less costs to sell when acquired, establishing a new cost basis. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when the legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan through the completion of a deed in lieu of foreclosure or through a similar legal agreement. These assets are subsequently accounted for at the lower of their cost or fair value less estimated costs to sell. If their fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments: Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Stock-Based Compensation	Stock-Based Compensation: Compensation cost is recognized for stock options and restricted stock awards issued to employees based on the fair value of the awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of the grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award.
Earnings per Common Share	Earnings per Common Share: Basic and diluted earnings per share is based on the two-class method prescribed in ASC Topic 260, Earnings Per Share (ASC 260). Stock options and restricted stock awards are considered outstanding for this calculation unless unearned. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock-based compensation plans. Earnings and dividends per share are restated for all stock splits and stock dividends through the date of issuance of the financial statements.
Income Taxes	Income Taxes: Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company does not expect the total amount of unrecognized tax benefits to significantly increase or decrease in the next twelve months. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. There were no interest or penalties recognized in the three and nine months ended September 30, 2018 or 2017.
Comprehensive Income/(Loss)	Comprehensive Income/(Loss): Comprehensive income/(loss) consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available for sale, which are also recognized as separate components of shareholders’ equity, net of tax.
Loss Contingencies	Loss Contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements.
Fair Value of Financial Instruments	Fair Value of Financial Instruments: Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 13—Fair Value of Financial Instruments. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect these estimates.
Operating Segments	Operating Segments: While the chief decision-makers monitor the revenue streams of the various products and services, operations are managed and financial performance is evaluated on a Company-wide basis. Discrete financial information is not available other than on a Company-wide basis.
Reclassifications	Reclassifications: Some items in the prior period financial statements were reclassified to conform to the current presentation. Reclassification had no effect on prior year net income or shareholders’ equity.
Recent Accounting Pronouncements	Recent Accounting Pronouncements: In May 2014, the Financial Accounting Standard Board (FASB) issued Accounting Standard Update (ASU) 2014-9 (ASU 2014-09), Revenue from Contracts with Customers. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfill a contract with a customer, as well as enhanced disclosure requirements. In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of ASU 2014-09 to fiscal years, and interim reporting periods within those fiscal years, beginning after December 15, 2017. In March 2016, the FASB issued ASU 2016-08 which clarified the revenue recognition implementation guidance on principal versus agent considerations and is effective during the same period as ASU 2014-09. In April 2016, the FASB issued ASU 2016-10 which clarified the revenue recognition guidance regarding the identification of performance obligations and the licensing implementation and is effective during the same period as ASU 2014-09. In May 2016, the FASB issued ASU 2016-12 which narrowly amended the revenue recognition guidance regarding collectability, noncash consideration, presentation of sales tax and transition. ASU 2016-12 is effective during the same period as ASU 2014-09. The majority of the Company’s revenue consists of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09. The Company adopted the new standard beginning January 1, 2018. The Company completed its analysis for determining the extent ASU 2014-09 will affect its noninterest income, primarily in the area of fees and service charges on deposit accounts and trade finance activities. Based on the analysis performed, the Company did not have a material change in the timing or measurement of revenues related to noninterest income. This guidance did not have a material impact on the Company’s consolidated financial statements. See Note 12. Revenue Recognition for further details. Effective January 2018, the Company adopted ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01). The main objective of ASU 2016-01 is to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. ASU 2016-01 addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Some of the amendments in ASU 2016-01 include the following: 1) Require equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income; 2) Simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; 3) Require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; and 4) Require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value. For public business entities, the amendments of ASU 2016-01 are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of ASU 2016-01 resulted in a transfer of $2.5 million of a mutual funds from securities available for sale to other investments on the consolidted balance sheet. However, this standard did not have a material impact on the consolidated financial statements. See Note 13 for fair value measurement disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02). ASU 2016-02 is intended to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet and disclosing key information about lease arrangements. This ASU is effective for annual periods and interim periods within those annual periods beginning after December 15, 2018. Based on leases outstanding at September 30, 2018, the Company does not expect this ASU to have a material impact on the income statement, but does anticipate an approximately $13 million increase in assets and liabilities once this ASU becomes effective. In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13). The objective of ASU 2016-13 is to provide financial statement users with decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit. ASU 2016-13 includes provisions that require financial assets measured at amortized cost (such as loans and held to maturity (HTM) debt securities) to be presented at the net amount expected to be collected. This will be accomplished through recognition of an estimate of all current expected credit losses. The estimate will include forecasted information for the timeframe that an entity is able to develop reasonable and supportable forecasts. This is a change from the current practice of recognizing incurred losses based on the probable initial recognition threshold under current GAAP. In addition, credit losses on available for sale (AFS) debt securities will be recorded through an allowance for credit losses rather than as a write-down. Under ASU 2016-13, an entity will be able to record reversals of credit losses in current period income when the estimate of credit losses declines, whereas current GAAP prohibits reflecting those improvements in current period earnings. ASU 2016-13 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2019, and early adoption is permitted for fiscal years, including interim periods, beginning after December 15, 2018. ASU 2016-13 will be applied through a cumulative effect adjustment to retained earnings (modified-retrospective approach), except for debt securities for which an other-than-temporary impairment had been recognized before the effective date. A prospective transition approach is required for these debt securities. The Company is currently evaluating the effects of ASU 2016-13 on its financial statements and disclosures, including software solutions, data requirements and loss estimation methodologies. The company has engaged a third party advisor to develop a new expected loss model. While the effects cannot yet be quantified, the Company expects ASU 2016-13 to add complexity and costs to its current credit loss evaluation process. In March 2017, the FASB issued ASU 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20) (ASU 2017-08). ASU 2017-08 amends the amortization period for certain purchased callable debt securities held at a premium. Prior to the issuance of this guidance, premiums were amortized as an adjustment of yield over the contractual life of the instrument. ASU 2017-08 requires premiums on purchased callable debt securities that have explicit, noncontingent call features that are callable at fixed prices to be amortized to the earliest call date. There are no accounting changes for securities held at a discount. This ASU is effective for annual periods and interim periods within those annual periods beginning after December 15, 2018, and early adoption is permitted. ASU 2017-08 will be applied through a cumulative effect adjustment through equity (modified-retrospective approach). The Company does not expect this ASU to have a material impact on its financial statements and disclosures. In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718), Scope of Modification Accounting (ASU 2017-09). ASU 2017-09 clarifies when changes to the terms and conditions of share-based payment awards must be treated as modifications. Specifically, the new guidance permits companies to make certain changes to awards without accounting for them as modifications. ASU 2017-09 is effective for annual periods beginning after December 31, 2017 and will be applied prospectively to an award modified after the effective date. There have been no changes to the terms and conditions of share-based payment awards, and as a result the adoption of this standard did not have a material effect on the Company’s operating results or financial condition. In February 2018, the FASB issued ASU No. 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” This ASU permits a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for stranded tax effects resulting from the Tax Act. The Company did not elect to apply the provision of ASU 2018-02.