Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited consolidated financial statements of WCF Bancorp, Inc. (the Company), and its wholly owned subsidiary WCF Financial Bank (the Bank), and Webster City Federal Service Corp., have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and in accordance with Securities and Exchange Commission (SEC) rules and regulations. Accordingly, the statements do not include all the information and footnotes required by GAAP for complete financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto that were included in the Company’s annual report for the year ended December 31, 2017. The consolidated balance sheet of the Company as of December 31, 2017 has been derived from the audited consolidated balance sheet of the Company as of that date. All significant intercompany transactions are eliminated in consolidation. In the opinion of the Company’s management, all adjustments necessary (i) for a fair presentation of the financial statements for the interim periods included herein and (ii) to make such financial statements not misleading have been made and are of a normal and recurring nature. Interim results are not necessarily indicative of results for a full year.
Use of Estimates	In preparing the financial statements, management is required to make estimates and assumptions that affect the recorded amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the period. Actual results could differ from the estimates.
Investment Securities	Investment securities are classified based on the Company’s intended holding period. Securities that may be sold prior to maturity to meet liquidity needs, to respond to market changes, or to adjust the Company’s asset-liability position are classified as available-for-sale. Currently, all securities are classified as available-for-sale. Securities available-for-sale are carried at fair value, with the aggregate unrealized gains or losses, net of the effect of taxes on income, reported as accumulated other comprehensive income or loss. Other-than-temporary impairment is recorded in net income. The Company’s net income reflects the full impairment (that is, the difference between the security’s amortized cost basis and fair value), if any, on debt securities that the Company intends to sell, or would more likely than not be required to sell, before the expected recovery of the amortized cost basis. For available-for-sale debt securities that management has no intent to sell, and believes that it will not more likely than not be required to sell prior to recovery, only the credit loss component of the impairment is recognized in net income, while the rest of the fair value loss is recognized in other comprehensive income. The credit loss component recognized in net income is identified as the amount of principal cash flows not expected to be received over the remaining term of the security as projected using the Company’s cash flow projections using its base assumptions. A decline in the fair value of any available-for-sale security below cost and that is deemed to be other-than-temporary results in an impairment to reduce the carrying amount by fair value for the credit portion of the loss. The impairment is charged to net income and a new cost basis for the security is established. To determine whether an impairment is other-than-temporary, the Company considers whether it has the ability to hold and lack of intent to sell the investment until a market price recovery and considers whether evidence indicating the cost of the investment is recoverable outweighs evidence to the contrary. Evidence considered in this assessment includes the reasons for the impairment, the severity and duration of the impairment, changes in value subsequent to year-end, and the general market conditions.
Loans Receivable, Net	Loans receivable are stated at the amount of unpaid principal, reduced by the allowance for loan losses, deferred loan fees and discounts on loans purchased. Loans receivable are charged against the allowance when management believes collectability of principal is unlikely. Interest on loans receivable is accrued and credited to operations based primarily on the principal amount outstanding. Certain loan balances include unearned discounts, which are recorded as income over the term of the loan. Accrued interest receivable on loans receivable that become more than 90 days in arrears is charged to an allowance that is established by a charge to interest income. Interest income is subsequently recognized only to the extent cash payments are received until, in management’s judgment, the borrower’s ability to make periodic interest and principal payments is reasonably assured, in which case the loan is returned to accrual status. Under the Company’s credit policies, commercial loans are considered impaired when management believes it is probable the Company will be unable to collect all contractual principal and interest payments due in accordance with the terms of the loan agreement. Loan impairment is measured based on the present value of expected future cash flows, discounted at the loan’s effective interest rate except, where more practical, at the observable market price of the loan or the fair value of the collateral, if the loan is collateral dependent.
Allowance for Loan Losses	The allowance for loan losses is based on management’s periodic evaluation of the loan portfolio and reflects an amount that, in management’s opinion, is appropriate to absorb probable losses in the existing portfolio. In evaluating the portfolio, management takes into consideration numerous factors, including current economic conditions, prior loan loss experience, the composition of the loan portfolio, value of underlying collateral, and management’s estimate of probable credit losses.
Taxes on Income	Deferred income taxes are provided under the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Interest and penalties on unrecognized tax benefits are classified as other noninterest expense.
Investment in Affiliate	The Company records its investment in an affiliate, New Castle Players, LLC, in which it has a 27.17% interest using the equity method of accounting. The affiliate holds an investment in a local hotel in Webster City, Iowa. The Company records the value of its investment at year-end based on the affiliate’s most current available financial statements. The investment in affiliate is analyzed annually. If impairment is determined to be other-than-temporary, the carrying amount is written down to fair value. The investment is included as a component of prepaid expenses and other assets on the consolidated balance sheets, while the equity income earned is included as a component of other noninterest income on the consolidated statements of income.
Employee Stock Ownership Plan	The shares of stock purchased by the ESOP are held in a suspense account until they are released for allocation among participants. The shares will be released annually from the suspense account and the released shares will be allocated to the participants on the basis of each participant’s compensation for the year of allocation. As shares are released from collateral, the Company recognizes compensation expense equal to the average market price of the shares during the period and the shares will be outstanding for earnings-per-share purposes. The shares not released are reported as unearned ESOP shares in the stockholders’ equity section on the consolidated balance sheets.
Current Accounting Developments	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606): Summary and Amendments that Create Revenue from Contracts with Customers (Topic 606) and Other Assets and Deferred Costs-Contracts with Customers (Subtopic 340-40). The guidance in this update supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition, and most industry-specific guidance throughout the industry topics of the Codification. This update will be effective for interim and annual periods beginning after December 15, 2018. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information by updating certain aspects or recognition, measurement, presentation and disclosure of financial instruments. Among other changes, the update includes requiring changes in fair value of equity securities with readily determinable fair value to be recognized in net income and clarifies that entities should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with entities other deferred tax assets. This update will be effective for interim and annual periods beginning after December 15, 2018, and is to be applied on a modified retrospective basis. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements, but does not expect the guidance to have a material impact on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU requires that financial assets measured at amortized cost should be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The allowance for credit losses should reflect management’s current estimate of credit losses that are expected to occur over the remaining life of a financial asset. This is in contrast to existing guidance whereby credit losses generally are not recognized until they are incurred. This update will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The Company is currently assessing the impact that this guidance will have on its 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. The amendments in this ASU shorten the amortization period for certain callable debt securities purchased at a premium. Upon adoption of the standard, premiums on these qualifying callable debt securities will be amortized to the earliest call date. Discounts on purchased debt securities will continue to be accreted to maturity. The amendments are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. Upon transition, entities should apply the guidance on a modified retrospective basis, with a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption and provide the disclosures required for a change in accounting principle. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendment in this update allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the December 22, 2017, enactment of the reduced federal corporate income tax rate, which is effective in 2018, with early adoption permitted. The amendment can be adopted at the beginning of the period or on a retrospective basis. The Company adopted the amendment in the first quarter of 2018 using the beginning of the period option.