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Fair Value Measurements (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of impaired loans 12metr_NumberOfImpairedLoans 9metr_NumberOfImpairedLoans
Allowance related to impaired loans 5,720us-gaap_ImpairedFinancingReceivableRelatedAllowance 5,643us-gaap_ImpairedFinancingReceivableRelatedAllowance
Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 50.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_InventoriesMember		  
Accounts Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 20.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AccountsReceivableMember		  
Foreclosed [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 15.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= metr_ForeclosedMember		  
Minimum [Member] | Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 10.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Equipment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 30.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_EquipmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member] | Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 30.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 35.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Equipment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 50.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_EquipmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Weighted average [Member] | Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans, collateral, discount rate 19.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 20.00%metr_ImpairedLoansCollateralDiscountRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Fair value measurements, nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans with specific allocation 7,168metr_ImpairedLoansWithSpecificAllocationFinancialAssetsFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 3,882metr_ImpairedLoansWithSpecificAllocationFinancialAssetsFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Allowance related to impaired loans 5,700us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 5,600us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired loans net of partial charge-offs 244metr_ImpairedLoansNetOfPartialChargeOffsFinancialAssetsFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 5,263metr_ImpairedLoansNetOfPartialChargeOffsFinancialAssetsFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans, Financial Assets, Fair Value, Charge-offs 119metr_ImpairedLoansFinancialAssetsFairValueChargeoffs
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 2,400metr_ImpairedLoansFinancialAssetsFairValueChargeoffs
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember