Significant Accounting Policies	12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Note 2: Significant Accounting Policies Basis of Presentation WMIH resumed timely filing of all periodic reports for a reporting company under the Securities Exchange Act of 1934, as amended, for all periods after emergence from bankruptcy on March 19, 2012 (the “Effective Date”). All significant intercompany transactions and balances have been eliminated in preparing the consolidated financial statements. Use of Estimates The preparation of financial statements in conformity with Generally Accepted Accounting Principles in the United States (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Management has made significant estimates in certain areas, including valuing certain financial instruments, other assets and liabilities, the determination of the contingent risk liabilities, and in determining appropriate insurance reserves. Actual results could differ substantially from those estimates. Fair Value of Certain Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Generally, for assets that are reported at fair value, the Company uses quoted market prices or valuation models to estimate their fair value. These models incorporate inputs such as forward yield curves, market volatilities and pricing spreads, utilizing market-based inputs where readily available. The degree of management judgment involved in estimating the fair value of a financial instrument or other asset is dependent upon the availability of quoted market prices or observable market inputs. For financial instruments that are actively traded in the marketplace or whose values are based on readily available market value data, little judgment is necessary when estimating the instrument’s fair value. When observable market prices and data are not readily available, significant management judgment often is necessary to estimate fair value. In those cases, different assumptions could result in significant changes in valuation. The Company classifies fixed-maturity investments as trading securities, which are recorded at fair value. As such, changes in unrealized gains and losses on investments held at the balance sheet date are recognized and reported as a component of net investment income on the consolidated statements of operations. The Company believes fair value provides better matching of investment earnings to potential cash flow generated from the investment portfolio and reduces subjectivity related to evaluating other-than-temporary impairment on the Company’s investment portfolio. The carrying value of cash and cash equivalents, restricted cash, accounts payable and accrued liabilities approximate their respective fair values due to their short-term nature. The carrying value of the loss contract reserve, in periods during which such reserve exists, approximates its fair value and is based on valuation methodologies using discounted cash flows at interest rates which approximate the Company’s weighted-average cost of capital. The carrying value of the derivative embedded conversion feature of the Original Series B Preferred Stock, in periods during which such derivative exists, is adjusted to its fair value as determined using Level 3 inputs described below under fair value measurement. The carrying value of notes payable approximates fair value based on time to maturity, underlying collateral, and prevailing interest rates. Fair Value Measurement The Company’s estimates of fair value for financial assets and financial liabilities are based on the framework established in the Financial Accounting Standards Board (“FASB”) Fair Value Measurements and Disclosures accounting guidance. The framework is based on the inputs used in valuation and requires that observable inputs be used in the valuations when available. The disclosure of fair value estimates in the fair value accounting guidance hierarchy is based on whether the significant inputs into the valuation are observable. In determining the level of the hierarchy in which the estimate is disclosed, the highest priority is given to unadjusted quoted prices in active markets and the lowest priority to unobservable inputs that reflect the Company’s significant market assumptions. The three levels of the hierarchy are as follows: Level 1—Inputs to the valuation methodology are quoted prices for identical assets or liabilities traded in active markets. Level 2—Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market corroborated inputs. Level 3—Valuations based on models where significant inputs are not observable. The unobservable inputs reflect the Company’s own assumptions about the inputs that market participants would use. Fair values are based on quoted prices in active markets when available (Level 1). The Company receives the quoted prices from a third party, nationally recognized pricing service. When quoted prices are not available, the Company utilizes a pricing service to determine an estimate of fair value. The fair value is generally estimated using current market inputs for similar financial instruments with comparable terms and credit quality, commonly referred to as matrix pricing (Level 2). These valuation techniques involve some level of management estimation and judgment. The Company recognizes transfers between levels in the fair value hierarchy at the end of the reporting period. Fixed-Maturity Securities Fixed-maturity securities consist of U.S. Treasury securities, obligations of U.S. government sponsored agencies, and domestic and foreign corporate debt securities. Fixed-maturity securities held in trust are for the benefit of the primary insurers as more fully described in Note 3: Insurance Activity. Investments in fixed-maturity securities are reported at their estimated fair values and are classified as trading securities in accordance with applicable accounting guidance. Realized gains and losses on the sale of fixed-maturity securities are determined using the specific identification method and are reported as a component of net investment income within the consolidated statements of operations. Investments Held in Trust Investments held in trust consist of cash equivalents, which include highly liquid overnight money market instruments, and fixed-maturity securities which are held in trust for the benefit of the primary insurers as more fully described in Note 3: Insurance Activity and Note 4: Investment Securities, and are subject to the restrictions on distribution of net assets of subsidiaries as described below. Third Party Restrictions on Distribution of Net Assets of Wholly-Owned Subsidiaries The net assets of WMMRC are subject to restrictions on distribution from multiple sources including the primary insurers who have approval control of distributions from the trust, and the Insurance Division of the State of Hawaii who has approval authority over distributions or intercompany advances. Premium Recognition Premiums assumed are earned on a daily pro-rata basis over the underlying policy terms. Premiums assumed relating to the unexpired portion of policies in force at the balance sheet date are recorded as unearned premiums. Unearned premiums also include a reserve for post default premium reserves. Post default premium reserves occur when a loan is in a default position and the servicer continues to advance the premiums. If the loan ultimately goes to claim, the premiums advanced during the period of default are subject to recapture. The Company records a post default premium reserve based on information provided by the underlying mortgage insurers when they provide information on the post default premium reserve separately from other reserves. The change in the post default premium reserve is reflected as a reduction or increase, as the case may be, in premiums assumed. The Company has recorded unearned premiums totaling $39 thousand and $0.3 million as of December 31, 2017 and December 31, 2016, respectively. The Company recognizes premium deficiencies when there is a probable loss on an insurance contract. Premium deficiencies are recognized if the sum of the present value of expected losses and loss adjustment expenses, unamortized deferred acquisition costs, and maintenance costs, excluding intercompany charges, exceed expected future unearned premiums and anticipated investment income. Premium deficiency reserves have been recorded totaling $0.3 million and $0.3 million as of December 31, 2017 and December 31, 2016, respectively. Intercompany administrative costs are excluded from the computation of premium deficiencies. The Company’s premium deficiency analysis was performed on a single book basis and includes all book years and reinsurance treaties aggregated together using assumptions based on the actuarial best estimates at the balance sheet date. The calculation for premium deficiency requires significant judgment and includes estimates of future expected premiums, claims, loss adjustment expenses and investment income as of the balance sheet date. To the extent ultimate losses are higher or premiums are lower than estimated, additional premium deficiency reserves may be required in the future. Cash and Cash Equivalents Cash and cash equivalents include cash on hand, amounts due from banks, U.S. Treasury bills and overnight investments. Except as described above in Investments Held in Trust, the Company considers all amounts that are invested in highly liquid overnight money market instruments to be cash equivalents. The Federal Deposit Insurance Corporation (“FDIC”) insures amounts on deposit with each financial institution up to limits as prescribed by law. The Company may hold funds with financial institutions in excess of the FDIC insured amount, however, the Company has not experienced any losses in such accounts and management believes it is not exposed to any significant credit risk on cash and cash equivalents. Restricted Cash Restricted cash includes proceeds of the Original Series B Preferred Stock offering held in escrow and included, through the termination of the Indentures (as defined in Note 7: Notes Payable) on October 2, 2017, amounts held for the express purposes of paying principal, interest and related fees on the Runoff Notes (as defined in Note 7: Notes Payable) pursuant to the terms of the Indentures. Ceding Commission Expense The Company is required to pay a ceding commission to certain primary insurers pursuant to certain reinsurance agreements. Losses and Loss Adjustment Reserves The losses and loss adjustment reserve include case basis estimates of reported losses and supplemental amounts for incurred but not reported (“IBNR”) losses. A default is considered the incident (e.g., the failure to make timely payment of mortgage payments) that may give rise to a claim for mortgage insurance. In establishing the losses and loss adjustment reserve, the Company based its estimates primarily on the ceded loss and loss adjustment reserves as provided by the primary mortgage guaranty carriers. WMMRC has recorded reserves at the ceded case reserves and IBNR levels established and reported by the primary mortgage guaranty carriers as of December 31, 2017 and December 31, 2016, respectively. Management believes that the recorded aggregate liability for unpaid losses and loss adjustment expenses at period end represents the Company’s best estimate, based upon the available data, of the amount necessary to cover the current cost of losses. However, due to the inherent uncertainty arising from fluctuations in the persistency rate of mortgage insurance claims, the Company’s size and lack of prior operating history, external factors such as future changes in regional or national economic conditions, judicial decisions, federal and state legislation related to mortgage restructuring and foreclosure restrictions, claims denials and coverage rescissions by primary carriers and other factors beyond the Company’s control, it is not presently possible to determine whether actual loss experience will conform to the assumptions used in determining the estimated amounts for such liability at the balance sheet date. Accordingly, the ultimate liability could be significantly higher or lower, as the case may be, than the amount indicated in the financial statements and there can be no assurance that the reserve amounts recorded will be sufficient. As adjustments to these estimates become necessary, such adjustments are reflected in current operations. Loss Contract Reserves A loss contract reserve relating to contractual obligations of WMMRC was established at March 19, 2012 as a result of applying fresh start accounting and in compliance with Accounting Standards Codification (“ASC”) 805-10-55-21- Broad Transactions, which defines a loss contract as a “contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it.” The value of this reserve is analyzed quarterly and is adjusted accordingly. This adjustment (if any) to the reserve produces an expense or contra-expense in the consolidated statements of operations. Derivatives We evaluate our convertible debt, options, warrants or other contracts to determine if those contracts or embedded components of those contracts qualify as derivatives to be separately accounted. This accounting treatment requires that the carrying amount of embedded derivatives be marked-to-market at each balance sheet date and carried at fair value. In the event that the fair value is recorded as a liability, the change in fair value during the period is recorded in the Statement of Operations as either income or expense. If an embedded derivative is no longer required to be separately accounted for due to conversion, exercise or modification to the terms of an instrument, the derivative is marked to fair value at the conversion, exercise or modification date and then the related fair value is reclassified to equity. In circumstances where the embedded conversion option in a convertible instrument is required to be bifurcated and there are also other embedded derivative instruments in the convertible instrument that are required to be bifurcated, the bifurcated derivative instruments are accounted for as a single, compound derivative instrument. The classification of financial instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. Equity instruments that are initially classified as equity that become subject to reclassification are reclassified to liability at the fair value of the instrument on the reclassification date. Management must determine whether an instrument (or an embedded feature) is indexed to our stock. An entity should use a two-step approach to evaluate whether an equity-linked financial instrument (or embedded feature) is indexed to its own stock, including evaluating the instrument’s contingent exercise and settlement provisions. The application of this exercise could affect the accounting for (i) certain freestanding warrants that contain exercise price adjustment features or contain contingently puttable cash settlement options, if any, and (ii) convertible notes containing anti-dilution protections and/or exercise price adjustment features. The Company had recorded a derivative embedded conversion feature as a result of the issuance of the Original Series B Preferred Stock which was adjusted to its fair value as determined using Level 3 inputs described above under Fair Value Measurement. The change in fair value of the derivative embedded conversion feature was calculated at each reporting date and recorded as other income or other expense on the statement of operations. As a result of the Series B Amendment, the embedded conversion feature was modified, and the derivative was marked to fair value at December 31, 2017 and then the related fair value was reclassified to equity in accordance with ASC 815-15-35-4 - Embedded Conversion Option that No Longer Meets Bifurcation Criteria, as more fully described in Note 9: Capital Stock and Derivative Instruments. Other Liabilities At December 31, 2017, the total balance of $16.3 million of other liabilities is comprised of $10.8 million of accrued fees relating to the Original Series B Preferred Stock offering, an accrual for professional fees and recurring business expenses currently payable of approximately $4.7 million and $0.8 million of accrued dividends relating to the Original Series B Preferred Stock. At December 31, 2016, the total balance of $14.1 million of other liabilities is comprised of $12.3 million of accrued fees relating to the Series B Preferred Stock Financing, an accrual for professional fees and recurring business expenses currently payable of approximately $1.1 million and $0.7 million of accrued dividends relating to the Original Series B Preferred Stock. Comprehensive Income (Loss) The Company has no comprehensive income (loss) other than the net income (loss) disclosed in the consolidated statements of operations. Net Income (Loss) Per Common Share In calculating earnings per share, the Company follows the two-class method, which distinguishes between the classes of securities based on the proportionate participation rights of each security type in the Company's undistributed income. The Series A Preferred Stock and the Series B Preferred Stock are treated as one class for purposes of applying the two-class method, because they have substantially equal rights and share equally on an as converted basis with respect to income available to WMIH common stockholders. Basic net income (loss) per WMIH common share is computed by dividing net income (loss) applicable to WMIH’s common stockholders by the weighted-average number of common shares outstanding for the period after subtracting the weighted-average of any unvested restricted shares outstanding, as these are subject to repurchase. Basic net income (loss) attributable to common stockholders is computed by deducting preferred dividends and the basic calculation of undistributed earnings attributable to participating securities from net income. Diluted net income per WMIH common share is computed by dividing net income applicable to WMIH’s common stockholders by the weighted-average number of common shares outstanding during the period after subtracting the weighted-average of any unvested restricted shares outstanding, as these are subject to repurchase and adding any potentially dilutive WMIH common stock equivalents outstanding during the period. Diluted net income attributable to common stockholders is computed by deducting preferred dividends and the diluted calculation of undistributed earnings attributable to participating securities from net income. If common stock equivalents exist, in periods where there is a net loss, diluted loss per common share would be equal to or less than basic net loss per common share, since the effect of including any common stock equivalents would be antidilutive. Equity-Based Compensation On May 22, 2012, WMIH’s Board of Directors (the “Board” or “Board of Directors”) approved the Company’s 2012 Long-Term Incentive Plan (the “2012 Plan”) so that awards of restricted stock could be made to its non-employee directors and to have a plan in place for awards of equity based compensation to executives and others in connection with the Company’s operations and future strategic plans. A total of 2.0 million shares of WMIH’s common stock were initially reserved for future issuance under the 2012 Plan, which became effective upon the Board approval on May 22, 2012. On February 10, 2014, the Board approved and adopted a First Amendment to the 2012 Plan, pursuant to which the number of shares of WMIH’s common stock reserved and available for grants under the 2012 Plan was increased from 2.0 million shares to 3.0 million shares, and the terms of the 2012 Plan were modified to permit such an increase through action of the Board, except when stockholder approval is necessary to comply with any applicable law, regulation or rule of any stock exchange on which WMIH’s shares are listed, quoted or traded. On February 25, 2015, the number of shares authorized and available for awards under the 2012 Plan was increased from 3.0 million to 12.0 million shares of WMIH’s common stock, subject to approval of stockholders of WMIH. This approval was received at WMIH’s Annual Meeting of Stockholders on April 28, 2015. The 2012 Plan provides for the granting of restricted shares and other cash and share based awards. The value of restricted stock is generally determined using the fair market value determined to be the trading price at the close of business on the respective date the awards were granted. Income Taxes The Company follows the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future income tax consequences attributable to differences between the carrying amounts and tax bases of assets and liabilities and losses carried forward and tax credits. Deferred tax assets and liabilities are measured using enacted tax rates and laws applicable to the years in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided to the extent that it is more likely than not that deferred tax assets will not be realized. The Company recognizes the financial statement effects of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. Penalties and interest, of which there are none, would be reflected in income tax expense. Tax years are open to the extent the Company has net operating loss (“NOL”) carry-forwards available to be utilized currently. On December 22, 2017, the President of the United States signed into law the Tax Cuts and Jobs Act which reforms U.S. Tax legislation and related laws. One of the provisions of the new tax law reduces the Company’s U.S. federal corporate income tax rate from 35% to 21%. Our deferred tax assets, although fully reserved, have been revalued at the lower rate beginning in 2017. The Company continues to evaluate the impact of the new tax law on its financial condition and results of operations. Dividend Policy WMIH has paid no dividends on its common stock on or after the Effective Date and currently has no plans to pay a dividend on its common stock. WMIH has declared and paid $18.0 million, $18.0 million and $17.0 million of dividends on its Original Series B Preferred Stock during the years ended December 31, 2017, December 31, 2016 and December 31, 2015, respectively. An additional $0.8 million, $0.7 million and $0.7 million of dividends were accrued as of December 31, 2017, December 31, 2016 and December 31, 2015, respectively, based on the Original Series B Preferred Stock dividends that accrued cash dividends at a rate of 3% per year. The Original Series B Preferred Stock was issued on January 5, 2015; therefore, no dividends were due or paid for any prior period. The Original Series B Preferred Stock was amended effective January 5, 2018 as further described in Note 15: Subsequent Events. Accounting Standards Recently Adopted In November 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. This standard provides guidance on the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. Restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statements of cash flows. The amendments of this ASU should be applied using a retrospective transition method and are effective for reporting periods beginning after December 15, 2017, with early adoption permitted. Other than the revised statement of cash flows presentation of restricted cash, the adoption of ASU 2016-18 did not have an impact on our consolidated financial statements. New Accounting Pronouncements The Company has reviewed new accounting pronouncements issued between November 9, 2017, the filing date of our most recent prior Form 10-Q, and the filing date of this Form 10-K and has determined that no pronouncements issued are relevant to the Company, and/or have a material impact on the Company’s consolidated financial position, results of operations or disclosure requirements.

Note 2: Significant Accounting Policies

Basis of Presentation

WMIH resumed timely filing of all periodic reports for a reporting company under the Securities Exchange Act of 1934, as amended, for all periods after emergence from bankruptcy on March 19, 2012 (the “Effective Date”).

All significant intercompany transactions and balances have been eliminated in preparing the consolidated financial statements.

Use of Estimates

The preparation of financial statements in conformity with Generally Accepted Accounting Principles in the United States (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Management has made significant estimates in certain areas, including valuing certain financial instruments, other assets and liabilities, the determination of the contingent risk liabilities, and in determining appropriate insurance reserves. Actual results could differ substantially from those estimates.

Fair Value of Certain Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Generally, for assets that are reported at fair value, the Company uses quoted market prices or valuation models to estimate their fair value. These models incorporate inputs such as forward yield curves, market volatilities and pricing spreads, utilizing market-based inputs where readily available. The degree of management judgment involved in estimating the fair value of a financial instrument or other asset is dependent upon the availability of quoted market prices or observable market inputs. For financial instruments that are actively traded in the marketplace or whose values are based on readily available market value data, little judgment is necessary when estimating the instrument’s fair value. When observable market prices and data are not readily available, significant management judgment often is necessary to estimate fair value. In those cases, different assumptions could result in significant changes in valuation.

The Company classifies fixed-maturity investments as trading securities, which are recorded at fair value. As such, changes in unrealized gains and losses on investments held at the balance sheet date are recognized and reported as a component of net investment income on the consolidated statements of operations. The Company believes fair value provides better matching of investment earnings to potential cash flow generated from the investment portfolio and reduces subjectivity related to evaluating other-than-temporary impairment on the Company’s investment portfolio.

The carrying value of cash and cash equivalents, restricted cash, accounts payable and accrued liabilities approximate their respective fair values due to their short-term nature.

The carrying value of the loss contract reserve, in periods during which such reserve exists, approximates its fair value and is based on valuation methodologies using discounted cash flows at interest rates which approximate the Company’s weighted-average cost of capital.

The carrying value of the derivative embedded conversion feature of the Original Series B Preferred Stock, in periods during which such derivative exists, is adjusted to its fair value as determined using Level 3 inputs described below under fair value measurement.

The carrying value of notes payable approximates fair value based on time to maturity, underlying collateral, and prevailing interest rates.

Fair Value Measurement

The Company’s estimates of fair value for financial assets and financial liabilities are based on the framework established in the Financial Accounting Standards Board (“FASB”) Fair Value Measurements and Disclosures accounting guidance. The framework is based on the inputs used in valuation and requires that observable inputs be used in the valuations when available. The disclosure of fair value estimates in the fair value accounting guidance hierarchy is based on whether the significant inputs into the valuation are observable. In determining the level of the hierarchy in which the estimate is disclosed, the highest priority is given to unadjusted quoted prices in active markets and the lowest priority to unobservable inputs that reflect the Company’s significant market assumptions.

The three levels of the hierarchy are as follows:

Level 1—Inputs to the valuation methodology are quoted prices for identical assets or liabilities traded in active markets.

Level 2—Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market corroborated inputs.

Level 3—Valuations based on models where significant inputs are not observable. The unobservable inputs reflect the Company’s own assumptions about the inputs that market participants would use.

Fair values are based on quoted prices in active markets when available (Level 1). The Company receives the quoted prices from a third party, nationally recognized pricing service. When quoted prices are not available, the Company utilizes a pricing service to determine an estimate of fair value. The fair value is generally estimated using current market inputs for similar financial instruments with comparable terms and credit quality, commonly referred to as matrix pricing (Level 2). These valuation techniques involve some level of management estimation and judgment. The Company recognizes transfers between levels in the fair value hierarchy at the end of the reporting period.

Fixed-Maturity Securities

Fixed-maturity securities consist of U.S. Treasury securities, obligations of U.S. government sponsored agencies, and domestic and foreign corporate debt securities. Fixed-maturity securities held in trust are for the benefit of the primary insurers as more fully described in Note 3: Insurance Activity. Investments in fixed-maturity securities are reported at their estimated fair values and are classified as trading securities in accordance with applicable accounting guidance. Realized gains and losses on the sale of fixed-maturity securities are determined using the specific identification method and are reported as a component of net investment income within the consolidated statements of operations.

Investments Held in Trust

Investments held in trust consist of cash equivalents, which include highly liquid overnight money market instruments, and fixed-maturity securities which are held in trust for the benefit of the primary insurers as more fully described in Note 3: Insurance Activity and Note 4: Investment Securities, and are subject to the restrictions on distribution of net assets of subsidiaries as described below.

Third Party Restrictions on Distribution of Net Assets of Wholly-Owned Subsidiaries

The net assets of WMMRC are subject to restrictions on distribution from multiple sources including the primary insurers who have approval control of distributions from the trust, and the Insurance Division of the State of Hawaii who has approval authority over distributions or intercompany advances.

Premium Recognition

Premiums assumed are earned on a daily pro-rata basis over the underlying policy terms. Premiums assumed relating to the unexpired portion of policies in force at the balance sheet date are recorded as unearned premiums. Unearned premiums also include a reserve for post default premium reserves. Post default premium reserves occur when a loan is in a default position and the servicer continues to advance the premiums. If the loan ultimately goes to claim, the premiums advanced during the period of default are subject to recapture. The Company records a post default premium reserve based on information provided by the underlying mortgage insurers when they provide information on the post default premium reserve separately from other reserves. The change in the post default premium reserve is reflected as a reduction or increase, as the case may be, in premiums assumed. The Company has recorded unearned premiums totaling $39 thousand and $0.3 million as of December 31, 2017 and December 31, 2016, respectively.

The Company recognizes premium deficiencies when there is a probable loss on an insurance contract. Premium deficiencies are recognized if the sum of the present value of expected losses and loss adjustment expenses, unamortized deferred acquisition costs, and maintenance costs, excluding intercompany charges, exceed expected future unearned premiums and anticipated investment income. Premium deficiency reserves have been recorded totaling $0.3 million and $0.3 million as of December 31, 2017 and December 31, 2016, respectively. Intercompany administrative costs are excluded from the computation of premium deficiencies.

The Company’s premium deficiency analysis was performed on a single book basis and includes all book years and reinsurance treaties aggregated together using assumptions based on the actuarial best estimates at the balance sheet date. The calculation for premium deficiency requires significant judgment and includes estimates of future expected premiums, claims, loss adjustment expenses and investment income as of the balance sheet date. To the extent ultimate losses are higher or premiums are lower than estimated, additional premium deficiency reserves may be required in the future.

Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, amounts due from banks, U.S. Treasury bills and overnight investments. Except as described above in Investments Held in Trust, the Company considers all amounts that are invested in highly liquid overnight money market instruments to be cash equivalents. The Federal Deposit Insurance Corporation (“FDIC”) insures amounts on deposit with each financial institution up to limits as prescribed by law. The Company may hold funds with financial institutions in excess of the FDIC insured amount, however, the Company has not experienced any losses in such accounts and management believes it is not exposed to any significant credit risk on cash and cash equivalents.

Restricted Cash

Restricted cash includes proceeds of the Original Series B Preferred Stock offering held in escrow and included, through the termination of the Indentures (as defined in Note 7: Notes Payable) on October 2, 2017, amounts held for the express purposes of paying principal, interest and related fees on the Runoff Notes (as defined in Note 7: Notes Payable) pursuant to the terms of the Indentures.

Ceding Commission Expense

The Company is required to pay a ceding commission to certain primary insurers pursuant to certain reinsurance agreements.

Losses and Loss Adjustment Reserves

The losses and loss adjustment reserve include case basis estimates of reported losses and supplemental amounts for incurred but not reported (“IBNR”) losses. A default is considered the incident (e.g., the failure to make timely payment of mortgage payments) that may give rise to a claim for mortgage insurance. In establishing the losses and loss adjustment reserve, the Company based its estimates primarily on the ceded loss and loss adjustment reserves as provided by the primary mortgage guaranty carriers.

WMMRC has recorded reserves at the ceded case reserves and IBNR levels established and reported by the primary mortgage guaranty carriers as of December 31, 2017 and December 31, 2016, respectively. Management believes that the recorded aggregate liability for unpaid losses and loss adjustment expenses at period end represents the Company’s best estimate, based upon the available data, of the amount necessary to cover the current cost of losses. However, due to the inherent uncertainty arising from fluctuations in the persistency rate of mortgage insurance claims, the Company’s size and lack of prior operating history, external factors such as future changes in regional or national economic conditions, judicial decisions, federal and state legislation related to mortgage restructuring and foreclosure restrictions, claims denials and coverage rescissions by primary carriers and other factors beyond the Company’s control, it is not presently possible to determine whether actual loss experience will conform to the assumptions used in determining the estimated amounts for such liability at the balance sheet date. Accordingly, the ultimate liability could be significantly higher or lower, as the case may be, than the amount indicated in the financial statements and there can be no assurance that the reserve amounts recorded will be sufficient. As adjustments to these estimates become necessary, such adjustments are reflected in current operations.

Loss Contract Reserves

A loss contract reserve relating to contractual obligations of WMMRC was established at March 19, 2012 as a result of applying fresh start accounting and in compliance with Accounting Standards Codification (“ASC”) 805-10-55-21- Broad Transactions, which defines a loss contract as a “contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it.” The value of this reserve is analyzed quarterly and is adjusted accordingly. This adjustment (if any) to the reserve produces an expense or contra-expense in the consolidated statements of operations.

Derivatives

We evaluate our convertible debt, options, warrants or other contracts to determine if those contracts or embedded components of those contracts qualify as derivatives to be separately accounted. This accounting treatment requires that the carrying amount of embedded derivatives be marked-to-market at each balance sheet date and carried at fair value. In the event that the fair value is recorded as a liability, the change in fair value during the period is recorded in the Statement of Operations as either income or expense. If an embedded derivative is no longer required to be separately accounted for due to conversion, exercise or modification to the terms of an instrument, the derivative is marked to fair value at the conversion, exercise or modification date and then the related fair value is reclassified to equity.

In circumstances where the embedded conversion option in a convertible instrument is required to be bifurcated and there are also other embedded derivative instruments in the convertible instrument that are required to be bifurcated, the bifurcated derivative instruments are accounted for as a single, compound derivative instrument.

The classification of financial instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. Equity instruments that are initially classified as equity that become subject to reclassification are reclassified to liability at the fair value of the instrument on the reclassification date.

Management must determine whether an instrument (or an embedded feature) is indexed to our stock. An entity should use a two-step approach to evaluate whether an equity-linked financial instrument (or embedded feature) is indexed to its own stock, including evaluating the instrument’s contingent exercise and settlement provisions. The application of this exercise could affect the accounting for (i) certain freestanding warrants that contain exercise price adjustment features or contain contingently puttable cash settlement options, if any, and (ii) convertible notes containing anti-dilution protections and/or exercise price adjustment features.

The Company had recorded a derivative embedded conversion feature as a result of the issuance of the Original Series B Preferred Stock which was adjusted to its fair value as determined using Level 3 inputs described above under Fair Value Measurement. The change in fair value of the derivative embedded conversion feature was calculated at each reporting date and recorded as other income or other expense on the statement of operations. As a result of the Series B Amendment, the embedded conversion feature was modified, and the derivative was marked to fair value at December 31, 2017 and then the related fair value was reclassified to equity in accordance with ASC 815-15-35-4 - Embedded Conversion Option that No Longer Meets Bifurcation Criteria, as more fully described in Note 9: Capital Stock and Derivative Instruments.

Other Liabilities

At December 31, 2017, the total balance of $16.3 million of other liabilities is comprised of $10.8 million of accrued fees relating to the Original Series B Preferred Stock offering, an accrual for professional fees and recurring business expenses currently payable of approximately $4.7 million and $0.8 million of accrued dividends relating to the Original Series B Preferred Stock. At December 31, 2016, the total balance of $14.1 million of other liabilities is comprised of $12.3 million of accrued fees relating to the Series B Preferred Stock Financing, an accrual for professional fees and recurring business expenses currently payable of approximately $1.1 million and $0.7 million of accrued dividends relating to the Original Series B Preferred Stock.

Comprehensive Income (Loss)

The Company has no comprehensive income (loss) other than the net income (loss) disclosed in the consolidated statements of operations.

Net Income (Loss) Per Common Share

In calculating earnings per share, the Company follows the two-class method, which distinguishes between the classes of securities based on the proportionate participation rights of each security type in the Company's undistributed income. The Series A Preferred Stock and the Series B Preferred Stock are treated as one class for purposes of applying the two-class method, because they have substantially equal rights and share equally on an as converted basis with respect to income available to WMIH common stockholders.

Basic net income (loss) per WMIH common share is computed by dividing net income (loss) applicable to WMIH’s common stockholders by the weighted-average number of common shares outstanding for the period after subtracting the weighted-average of any unvested restricted shares outstanding, as these are subject to repurchase. Basic net income (loss) attributable to common stockholders is computed by deducting preferred dividends and the basic calculation of undistributed earnings attributable to participating securities from net income.

Diluted net income per WMIH common share is computed by dividing net income applicable to WMIH’s common stockholders by the weighted-average number of common shares outstanding during the period after subtracting the weighted-average of any unvested restricted shares outstanding, as these are subject to repurchase and adding any potentially dilutive WMIH common stock equivalents outstanding during the period. Diluted net income attributable to common stockholders is computed by deducting preferred dividends and the diluted calculation of undistributed earnings attributable to participating securities from net income.

If common stock equivalents exist, in periods where there is a net loss, diluted loss per common share would be equal to or less than basic net loss per common share, since the effect of including any common stock equivalents would be antidilutive.

Equity-Based Compensation

On May 22, 2012, WMIH’s Board of Directors (the “Board” or “Board of Directors”) approved the Company’s 2012 Long-Term Incentive Plan (the “2012 Plan”) so that awards of restricted stock could be made to its non-employee directors and to have a plan in place for awards of equity based compensation to executives and others in connection with the Company’s operations and future strategic plans. A total of 2.0 million shares of WMIH’s common stock were initially reserved for future issuance under the 2012 Plan, which became effective upon the Board approval on May 22, 2012. On February 10, 2014, the Board approved and adopted a First Amendment to the 2012 Plan, pursuant to which the number of shares of WMIH’s common stock reserved and available for grants under the 2012 Plan was increased from 2.0 million shares to 3.0 million shares, and the terms of the 2012 Plan were modified to permit such an increase through action of the Board, except when stockholder approval is necessary to comply with any applicable law, regulation or rule of any stock exchange on which WMIH’s shares are listed, quoted or traded. On February 25, 2015, the number of shares authorized and available for awards under the 2012 Plan was increased from 3.0 million to 12.0 million shares of WMIH’s common stock, subject to approval of stockholders of WMIH. This approval was received at WMIH’s Annual Meeting of Stockholders on April 28, 2015. The 2012 Plan provides for the granting of restricted shares and other cash and share based awards. The value of restricted stock is generally determined using the fair market value determined to be the trading price at the close of business on the respective date the awards were granted.

Income Taxes

The Company follows the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future income tax consequences attributable to differences between the carrying amounts and tax bases of assets and liabilities and losses carried forward and tax credits. Deferred tax assets and liabilities are measured using enacted tax rates and laws applicable to the years in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided to the extent that it is more likely than not that deferred tax assets will not be realized.

The Company recognizes the financial statement effects of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. Penalties and interest, of which there are none, would be reflected in income tax expense. Tax years are open to the extent the Company has net operating loss (“NOL”) carry-forwards available to be utilized currently.

On December 22, 2017, the President of the United States signed into law the Tax Cuts and Jobs Act which reforms U.S. Tax legislation and related laws. One of the provisions of the new tax law reduces the Company’s U.S. federal corporate income tax rate from 35% to 21%. Our deferred tax assets, although fully reserved, have been revalued at the lower rate beginning in 2017. The Company continues to evaluate the impact of the new tax law on its financial condition and results of operations.

Dividend Policy

WMIH has paid no dividends on its common stock on or after the Effective Date and currently has no plans to pay a dividend on its common stock.

WMIH has declared and paid $18.0 million, $18.0 million and $17.0 million of dividends on its Original Series B Preferred Stock during the years ended December 31, 2017, December 31, 2016 and December 31, 2015, respectively. An additional $0.8 million, $0.7 million and $0.7 million of dividends were accrued as of December 31, 2017, December 31, 2016 and December 31, 2015, respectively, based on the Original Series B Preferred Stock dividends that accrued cash dividends at a rate of 3% per year. The Original Series B Preferred Stock was issued on January 5, 2015; therefore, no dividends were due or paid for any prior period. The Original Series B Preferred Stock was amended effective January 5, 2018 as further described in Note 15: Subsequent Events.

Accounting Standards Recently Adopted

In November 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. This standard provides guidance on the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. Restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period amounts shown on the statements of cash flows. The amendments of this ASU should be applied using a retrospective transition method and are effective for reporting periods beginning after December 15, 2017, with early adoption permitted. Other than the revised statement of cash flows presentation of restricted cash, the adoption of ASU 2016-18 did not have an impact on our consolidated financial statements.

New Accounting Pronouncements

The Company has reviewed new accounting pronouncements issued between November 9, 2017, the filing date of our most recent prior Form 10-Q, and the filing date of this Form 10-K and has determined that no pronouncements issued are relevant to the Company, and/or have a material impact on the Company’s consolidated financial position, results of operations or disclosure requirements.