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Long-term Debt (Details) (Federal Home Loan Bank Advances [Member], USD $)
Mar. 31, 2015
Debt Instrument [Line Items]  
Amount $ 25,000,000.0us-gaap_DebtInstrumentFaceAmount
FHLB Advance Due January 2018 [Member]  
Debt Instrument [Line Items]  
Amount 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Interest Rate 1.10963%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
FHLB Advance Due January 2019 [Member]  
Debt Instrument [Line Items]  
Amount 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Interest Rate 1.387%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
FHLB Advance Due January 2020 [Member]  
Debt Instrument [Line Items]  
Amount $ 5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Interest Rate 1.62%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= metr_FHLBAdvanceDueJanuary2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember