Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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 interim statements should be read in conjunction with the audited consolidated financial statements and notes included in the Annual Report on Form 10-K for the year ended December 31, 2019 filed by the Company with the SEC. The December 31, 2019 balance sheet presented herein has been derived from the audited financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2019 filed with the SEC, but does not include all of the disclosures required by GAAP for complete financial statements. 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. Certain reclassifications have been made in the prior period financial statements to conform to the current period presentation. The results of operations for the six months ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of PCB Bancorp and its wholly owned subsidiary as of June 30, 2020 and December 31, 2019 and for the three and six months ended June 30, 2020 and 2019. Significant inter-company accounts and transactions have been eliminated in consolidation. Unless the context requires otherwise, all references to the Company include its wholly owned subsidiary.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of the 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. These estimates are subject to change and such change could have a material effect on the consolidated financial statements. Actual results may differ from those estimates.
Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	Adopted Accounting Pronouncements During the six months ended June 30, 2020, there were no significant accounting pronouncements applicable to the Company that became effective. Recent Accounting Pronouncements Not Yet Adopted The following is recently issued accounting pronouncements applicable to the Company that has not yet been adopted: In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, “Financial Instruments-Credit Losses (Topic 326).” The amendments in this ASU require that entities change the impairment model for most financial assets that are measured at amortized cost and certain other instruments from an incurred loss model to an expected loss model. Under this model, entities will estimate credit losses over the entire contractual term of the instrument from the date of initial recognition of that instrument. It includes financial assets such as loan receivables, held-to-maturity debt securities, net investment in leases that are not accounted for at fair value through net income, and certain off-balance sheet credit exposures. This ASU is effective for public business entities that are SEC filers for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. In 2019, the FASB amended this ASU, which delays the effective date to 2023 for certain SEC filers that are Smaller Reporting Companies, which would apply to the Company. The Company plans to adopt this ASU at the delayed effective date of January 1, 2023.
Small Business Administration Paycheck Protection Program	Small Business Administration Paycheck Protection Program Small Business Administration (“SBA”) launched the Paycheck Protection Program (“PPP”) to provide a direct incentive for small businesses to keep their workers on the payroll in respond to the COVID-19 pandemic. SBA will forgive loans if all employee retention criteria are met and the funds are used for eligible expenses. Since the launch of PPP, the Company has extended 1,551 SBA PPP loans totaling $133.7 million, net of unamortized deferred fees and costs, as of June 30, 2020. The Company deferred loan origination fees of $5.6 million and direct origination costs of $1.1 million on SBA PPP loans. The Company amortizes these deferred fees and costs without prepayment assumption using the contractual lives of SBA PPP loans. The SBA guarantee on PPP loans cannot be separated from the loan and therefore is not a separate unit of account. The Company considered the SBA guarantee in the allowance for loan evaluation and determined that it is not required to reserve additional allowance for loan losses on SBA PPP loans at June 30, 2020.