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Note 6 - Stock Option Plans Due in five to ten years, Fair value Note 8 - Fair Value of Financial Instruments Collateralized Mortgage Backed Securities [Member] Note 9 - Off-balance Sheet Financial Instruments Note 10 - Premises and Equipment Note 2 - Securities Available for Sale - Summary of Carrying Amount and Fair Values of Securities (Details) Note 2 - Securities Available for Sale - Summary of Sale of Securities Available for Sale (Details) Note 2 - Securities Available for Sale - Summary of Securities in Continuous Unrealized Loss Position (Details) Expected stock volatility Note 2 - Securities Available for Sale - Securities Available for Sale Measured at Fair Value on Recurring Basis (Details) pmhg_CapitalConservationBufferRate Capital Conservation Buffer Rate Represents the capital conservation buffer rate. Note 2 - Securities Available for Sale - Scheduled Maturities of Securities with Fair Value and Amortized Cost (Details) Note 3 - Loans - Composition of Company's Loan Portfolio, Excluding Loans Held for Sale (Details) Common Equity Tier 1 Risk-based Capital, For Capital Adequacy Purposes, Percentage Represents the Common Equity Tier 1 Capital (CET) capital required for capital adequacy to risk weighted assets. Note 3 - Loans - Summary of Changes in Allowance for Loan Losses (Details) Note 3 - Loans - Summary of Loan Credit Quality (Details) Expected life in years (Year) Note 3 - Loans - Summary of Past Due Loans (Details) Note 3 - Loans - Summary of Impaired Loans (Details) Note 3 - Loans - Summary of Average Net Investment in Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Details) Note 3 - Loans - Summary of Loans Determined to Be Troubled Debt Restructurings (Details) Note 4 - Regulatory Capital - Summary of Regulatory Capital Requirements and Bank's Capital Position (Details) Common Equity Tier 1 Risk-based Capital, For Well Capitalized Purposes, Percentage Represents Common Equity Tier 1 Capital (CET) capital be well capitalized to risk weighted assets. US States and Political Subdivisions Debt Securities [Member] Note 5 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Details) Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Note 6 - Stock Option Plans - Summary of the 2015 Plan (Details) Note 6 - Stock Option Plans - Black-Scholes Option-pricing Model Assumptions (Details) Note 6 - Stock Option Plans - Summary of the 2007 Stock Option Plan (Details) Loans held for sale Loans held for sale Note 8 - Fair Value of Financial Instruments - Fair Values and Fair Value Measurement Method of Financial Instruments (Details) Note 9 - Off-balance Sheet Financial Instruments - Summary of Off-balance Sheet Financial Instruments (Details) Share-based Compensation, Stock Options, Activity [Table Text Block] Note 10 - Premises and Equipment - Summary of New Rent Obligations (Details) Notes To Financial Statements Non-qualified Stock Options [Member] Represents information pertaining to non-qualified stock options. Pass [Member] us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss Gross Unrealized Losses, Over Twelve Months Notes To Financial Statements [Abstract] pmhg_MaximumPercentageOfSharesIssued Maximum Percentage of Shares Issued Represents the maximum shares that may be issued, expressed as a percentage of the issued and outstanding shares of the entity's common stock. The 2015 Stock Incentive Compensation Plan [Member] Represents information pertaining to the 2015 Stock Incentive Compensation Plan. The 2007 Stock Option Plan [Member] Represents information pertaining to the 2007 Stock Option Plan. Maturities and calls of securities available for sale pmhg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageRemainingContractualTerm Share-based Compensation Arrangement By Share-based Payment Award, Options, Nonvested, Weighted Average Remaining Contractual Term Represents the weighted average remaining contractual term for nonvested stock options under a share-based compensation plan. Remaining Employees [Member] Represents information pertaining to the remaining employees. Incentive Stock Options [Member] Represents information pertaining to incentive stock options. us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss Gross Unrealized Losses, Less Than Twelve Months Proceeds from sale of securities pmhg_StockConsiderationOnPercentageOfCommonStockReceivedUponCashFees Stock Consideration on Percentage of Common Stock Received Upon Cash Fees Represents the amount of common stock received for directors' fees, when directors elect to receive stock in lieu of cash fees, expressed as a percentage of the cash fees that would be paid. US Government Agencies Debt Securities [Member] Internal Credit Assessment [Axis] Directors' Plan [Member] Represents information pertaining to the Directors' Plan, which permits the Company's and the Bank's directors to elect to receive any compensation to be paid to them in shares of the Company's common stock. Principal repayments of securities available for sale Internal Credit Assessment [Domain] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Standby Financial Letters of Credit [Member] Represents information pertaining to standby financial letters of credit. Off-balance Sheet Financial Instruments [Text Block] Complete disclosure of off-balance sheet financial instruments. Exercisable at September 30, 2018 (in years) (in dollars per share) Exercisable at September 30, 2018 (in years) (Year) Swap Liabilities [Member] Represents information pertaining to swap liabilities. Exercisable at September 30, 2018 (in years) us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Guaranteed Accounts [Member] Represents information pertaining to guaranteed accounts. Construction Loans In Process [Member] Represents information pertaining to construction loans in process. Exercisable at September 30, 2018 (in years) (in shares) Outstanding at September 30, 2018 (in years) (Year) Outstanding at September 30, 2018 (in years) Fair Value, Less Than Twelve Months Fair Value, Over Twelve Months pmhg_LeaseInitialSettingUpPeriod Lease, Initial Setting-up Period Represents the initial setting-up period for an operating lease. pmhg_LesseeOperatingLeaseNumberOfRenewalOptions Lessee, Operating Lease, Number of Renewal Options Represents the number of renewal options under an operating lease. pmhg_LeaseRentCommencementPeriod Lease Rent Commencement Period Represents the duration of time following the delivery date at which the new rent obligations will commence under an operating lease. 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Modification [Domain] Net earnings, basic Net earnings, diluted Impaired Financing Receivables [Table Text Block] Troubled Debt Restructurings on Financing Receivables [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Other assets Equity Award [Domain] Award Type [Axis] Net earnings Net earnings Net earnings (unaudited) Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Domain] Nonperforming Financial Instruments [Member] Financing Receivable Credit Quality Indicators [Table Text Block] Accruing Loans, Current Employee Stock Option [Member] Accruing Loans, Past Due Nonaccrual Loans Financing Receivable, Recorded Investment, Nonaccrual Status Financing Receivables, 30 to 59 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Past Due Financing Receivables [Table Text Block] Financing Receivables, Period Past 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for impairment us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent Deferred income tax benefit (expense) on above change Balance in allowance for loan losses, individually evaluated for impairment Balance in allowance for loan losses, collectively evaluated for impairment Amendment Flag us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income New Accounting Pronouncements, Policy [Policy Text Block] Reclassification, Policy [Policy Text Block] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (unaudited) (in shares) Preferred stock, shares outstanding (in shares) Allowance for Credit Losses on Financing Receivables [Table Text Block] us-gaap_GainLossOnSalesOfLoansNet Gain on sale of loans held for sale us-gaap_IncreaseDecreaseInOtherOperatingAssets Net decrease (increase) in other assets Current Fiscal Year End Date Future rent commitments, years 11-15 Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in eleven to fifteen years. Future rent commitments, years 6-10 Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in six to ten years. Future rent commitments, years 1-5 Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in one to five years. us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss Net loss on sale of securities Accrued interest receivable Accrued interest receivable Document Fiscal Period Focus Document Fiscal Year Focus us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet Net (charge-offs) recoveries Document Period End Date Tier 1 Leverage Capital, actual percentage Tier 1 Leverage Capital, For Capital Adequacy Purposes, Percentage Entity Emerging Growth Company Tier 1 Leverage Capital, For Well Capitalized Purposes, Percentage Document Type Total Risk-based Capital, For Well Capitalized Purposes, Percentage Entity Small Business Entity Ex Transition Period Common Equity Tier 1 Risk-based Capital, actual percentage Document Information [Line Items] us-gaap_DebtInstrumentCollateralAmount Debt Instrument, Collateral Amount Document Information [Table] Total Risk-based Capital, actual percentage Entity Filer Category Tier 1 Risk-based Capital, actual percentage Entity Current Reporting Status Tier 1 Risk-based Capital, For Capital Adequacy Purposes, Percentage Tier 1 Risk-based Capital, For Well Capitalized Purposes, Percentage Total Risk-based Capital, actual amount us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet Net increase in accrued interest receivable Total Risk-based Capital, For Capital Adequacy Purposes, Amount Total Risk-based Capital, For Well Capitalized Purposes, Amount Bank-owned life insurance Tier 1 Leverage Capital, actual amount Tier 1 Leverage Capital, For Capital Adequacy Purposes, Amount Tier 1 Leverage Capital, For Well Capitalized Purposes, Amount us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage Common Equity Tier 1 Risk-based Capital, actual amount Stock-based compensation (unaudited) Statement of Comprehensive Income [Abstract] Common Equity Tier 1 Risk-based Capital, For Capital Adequacy Purposes, Amount Common Equity Tier 1 Risk-based Capital, For Well Capitalized Purposes, Amount Entity Central Index Key Depreciation and amortization Tier 1 Risk-based Capital, actual amount Entity Registrant Name Tier 1 Risk-based Capital, For Capital Adequacy Purposes, Amount Tier 1 Risk-based Capital, For Well Capitalized Purposes, Amount Entity [Domain] Legal Entity [Axis] Credit Availability Concentration Risk [Member] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Regulatory Capital Requirements under Banking Regulations [Text Block] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Entity Common Stock, Shares Outstanding (in shares) Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Loans, net of allowance for loan losses of $3,674 and $3,136 Loans, net Professional fees Loans receivable, allowance for loan losses Allowance for loan losses Beginning balance Ending balance Marketing Trading Symbol Total loans Loans by credit quality Net deferred loan costs Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Occupancy and equipment us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale Loans originated as held for sale us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised Number of Options, exercised (in shares) Stock options exercised (unaudited) (in shares) us-gaap_TableTextBlock Notes Tables us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised Stock options exercised (unaudited) Director [Member] Chief Executive Officer [Member] Common stock issued as compensation to directors (unaudited) (in shares) Proceeds from the sale of loans held for sale us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross Stock Issued During Period, Value, Share-based Compensation, Gross Number of Options, granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Number of Options, forfeited (in shares) Federal Home Loan Bank stock us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available Sale of common stock net of stock offering costs $1,043 (unaudited) (in shares) us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' equity Reported Value Measurement [Member] Sale of common stock net of stock offering costs $1,043 (unaudited) Federal funds sold Retained earnings Accumulated other comprehensive loss us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Subsequent Events [Text Block] Deposits Stock-based compensation expense Title of Individual [Axis] Relationship to Entity [Domain] Interest expense- Comprehensive Income, Policy [Policy Text Block] Other Stock issued as compensation us-gaap_InterestAndDividendIncomeOperating Total interest income us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments Amortization of premiums and discounts on securities available for sale us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term Securities Share-based Compensation, Option and Incentive Plans, Director Policy [Policy Text Block] us-gaap_CashAndCashEquivalentsFairValueDisclosure Cash and cash equivalents Fair Value, Measurements, Nonrecurring [Member] Common stock, $.01 par value; 9,000,000 shares authorized, 3,128,671 and 3,118,977 issued and outstanding Measurement Frequency [Axis] Adjustments to reconcile net earnings to net cash provided by (used in) operating activities: us-gaap_AmortizationOfDeferredLoanOriginationFeesNet Net amortization of deferred loan fees Fair Value, Measurement Frequency [Domain] Loans Fair Value, Measurements, Recurring [Member] Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Range [Domain] Maximum [Member] Noncash transaction- Minimum [Member] Product and Service [Axis] Product and Service [Domain] Range [Axis] Interest income: Preferred stock, undesignated; 1,000,000 shares authorized, none issued or outstanding Preferred stock, shares issued (in shares) Interest Mortgage banking revenue us-gaap_IncomeTaxesPaid Income taxes Property, Plant and Equipment Disclosure [Text Block] Preferred stock, shares authorized (in shares) Portion at Fair Value Measurement [Member] [Default] Estimate of Fair Value Measurement [Member] Total noninterest income Measurement Basis [Axis] Fair Value, Inputs, Level 3 [Member] Other income Fair Value Hierarchy and NAV [Domain] Income from bank-owned life insurance Income from bank-owned life insurance Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Noninterest income: Fair Value Hierarchy and NAV [Axis] Provision for loan losses us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss Net interest income after provision for loan losses us-gaap_ProvisionForLoanAndLeaseLosses Provision (credit) for loan losses us-gaap_InterestIncomeExpenseNet Net interest income Cash flows from operating activities: Statement [Line Items] Additional paid-in capital us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability Off-Balance Sheet Items AOCI Attributable to Parent [Member] Stockholders' equity: us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure Federal Home Loan Bank stock Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] us-gaap_LoansReceivableFairValueDisclosure Loans Receivable, Fair Value Disclosure Deposit Account [Member] Fair Value Disclosures [Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Assets Software maintenance, amortization and other Represents the amount of software maintenance amortization and other non interest expense recorded during the period. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase (decrease) in cash and cash equivalents us-gaap_Liabilities Total liabilities us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities Other liabilities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Accumulated other comprehensive loss, net change in unrealized (loss) gain on securities available for sale, net of taxes Represents the amount during the period of accumulated other comprehensive loss, net change in unrealized gain (loss) on securities available for sale, net of tax benefit. pmhg_PaymentsForLoanOriginationsNetOfPrincipalPayments Loan originations, net of principal repayments Represents the cash outflow during the period for loan originations, net of principal payments. pmhg_NumberOfBankingOffices Number of Banking Offices Represents the entity's number of banking offices as of a specified date. pmhg_SubsidiaryOwnershipPercentageByParent Subsidiary, Ownership Percentage By Parent Represents the percentage ownership of the subsidiary owned by the parent. Sale of common stock, offering costs Related Allowance Interest Income Received Interest Income Recognized With No Related Allowance Recorded, Recorded Investment us-gaap_PaymentsOfDividendsCommonStock Common stock dividends paid With an Allowance Recorded, Recorded Investment Total Recorded Investment Average Recorded Investment With No Related Allowance Recorded, Unpaid Contractual Principal Balance With an Allowance Recorded, Unpaid Contractual Principal Balance Total Unpaid Contractual Principal Balance us-gaap_OtherNoninterestExpense Other us-gaap_NoninterestExpense Total noninterest expense FDIC/State assessment Retained Earnings [Member] Service charges and fees on deposit accounts Proceeds from stock options exercised Proceeds from sale of common stock, net Noninterest expense: Additional Paid-in Capital [Member] Real Estate Mortgage Loans [Member] Represents information pertaining to real estate mortgage loans. pmhg_NumberOfPortfolioClasses Number of Portfolio Classes Represents the number of loan portfolio classes. Common Stock [Member] pmhg_NumberOfLoanPortfolioSegments Number of Loan Portfolio Segments Represents the number of loan portfolio segments. Collateral [Domain] Collateral Pledged [Member] Equity Components [Axis] pmhg_LoanMaturityPeriod Loan Maturity Period Represents the loan maturity period. Equity Component [Domain] Collateral [Axis] Commercial Real Estate Portfolio Segment [Member] Financing Receivable Portfolio Segment [Domain] Commercial Portfolio Segment [Member] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Earnings before income taxes Residential Portfolio Segment [Member] Consumer Portfolio Segment [Member] Financing Receivable Portfolio Segment [Axis] Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block] Contractual amounts with off-balance-sheet risk Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Cash dividends per common share(1) (in dollars per share) Loans and Finance Receivables [Member] Loans Receivable [Member] Mortgage Receivable [Member] Receivable Type [Axis] Receivable [Domain] us-gaap_DepositsFairValueDisclosure Deposits us-gaap_PaymentsToAcquireAvailableForSaleSecurities Purchase of securities available for sale Proceeds from sale of securities available for sale Per share fair value of options issued during period (in dollars per share) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted-average Shares, diluted (in shares) Scenario, Forecast [Member] Statement [Table] Scenario [Axis] Statement of Financial Position [Abstract] Scenario, Unspecified [Domain] Diluted (in dollars per share) Net earnings, per share amount, diluted (in dollars per share) Weighted-average Shares, basic (in shares) Basic (in dollars per share) Net earnings, per share amount, basic (in dollars per share) Statement of Cash Flows [Abstract] Statement of Stockholders' Equity [Abstract] Available-for-sale Securities [Table Text Block] Income Statement [Abstract] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Total other comprehensive (loss) income Net change in unrealized gain on securities available for sale, net of income taxes (unaudited) us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet Loss on sale of securities available for sale Official checks Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] us-gaap_Deposits Total deposits Net increase in deposits Noninterest-bearing demand deposits Time deposits Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Realized Gain (Loss) [Table Text Block] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent Net change in unrealized (loss) gain Savings, NOW and money-market deposits us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax Reclassification adjustment for realized loss Change in unrealized (loss) gain on securities: Fair Value, Assets Measured on Recurring Basis [Table Text Block] Unrealized (loss) gain arising during the period Cash flows from financing activities: Real Estate Construction Loan [Member] Represents information pertaining to real estate construction loans. Period 2 [Member] Represents information pertaining to the second period. Period 1 [Member] Represents information pertaining to the first period. pmhg_PeriodOfAdjustmentOfInterestRate Period of Adjustment of Interest Rate Represents the periods of adjustable rate mortgages. pmhg_PeriodOfFixedInterestRate Period of Fixed Interest Rate Represents the periods of fixed rate mortgages. Commitments to Extend Credit [Member] Period 4 [Member] Represents information pertaining to the fourth period. Period 3 [Member] Represents information pertaining to the third period. Unused lines of Credit [Member] pmhg_FinancingReceivableRecordedInvestmentNonaccrualStatusNumberOfLoans Financing Receivable, Recorded Investment, Nonaccrual Status, Number of Loans Number of loans in financing receivables that are 30 or more days past due and on nonaccrual status at the balance sheet date. pmhg_ImpairmentValuationLoanLimit Impairment Valuation Loan Limit Value determined to evaluate the threshold for a financing receivable. Equipment Loans [Member] Represents information pertaining to equipment loans. Schedule of Portfolio of Loans [Table Text Block] Tabular disclosure of the portfolio of loans. us-gaap_StockholdersEquity Total stockholders' equity Beginning balance Ending balance (unaudited) Class of Stock [Axis] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Gross Unrealized Losses Gross Unrealized Gains Impaired Financing Receivables, Average Recorded Investment, and Interest Income Recognized [Table Text Block] Tabular disclosure of impaired financing receivables, average recorded investment, and interest income recognized. Amortized Cost Total, amortized cost Due in one to five years, amortized cost Due in five to ten years, amortized cost Due after ten years, amortized cost