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Securities (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
security_type
Dec. 31, 2013
Dec. 31, 2012
security
Investment Securities [Line Items]                      
Number of securities sold                     48metr_NumberOfSecuritiesSold
Investment securities, fair value                     $ 305,400,000us-gaap_InvestmentsFairValueDisclosure
Net gains (losses) on sales/calls of securities (119,000)us-gaap_GainLossOnSaleOfSecuritiesNet 26,000us-gaap_GainLossOnSaleOfSecuritiesNet 0us-gaap_GainLossOnSaleOfSecuritiesNet 11,000us-gaap_GainLossOnSaleOfSecuritiesNet 643,000us-gaap_GainLossOnSaleOfSecuritiesNet 0us-gaap_GainLossOnSaleOfSecuritiesNet (9,000)us-gaap_GainLossOnSaleOfSecuritiesNet 30,000us-gaap_GainLossOnSaleOfSecuritiesNet (82,000)us-gaap_GainLossOnSaleOfSecuritiesNet 664,000us-gaap_GainLossOnSaleOfSecuritiesNet 1,051,000us-gaap_GainLossOnSaleOfSecuritiesNet
Gain (Loss) on Sale of Securities, Tax                 (29,000)metr_GainLossOnSaleOfSecuritiesTax 232,000metr_GainLossOnSaleOfSecuritiesTax 368,000metr_GainLossOnSaleOfSecuritiesTax
Securities, held to maturity, fair value 319,923,000us-gaap_HeldToMaturitySecuritiesFairValue       263,697,000us-gaap_HeldToMaturitySecuritiesFairValue       319,923,000us-gaap_HeldToMaturitySecuritiesFairValue 263,697,000us-gaap_HeldToMaturitySecuritiesFairValue  
Number of securities, type                 2metr_InvestmentPortfolioNumberOfSecuritiesByType    
Corporate Debt, Mortgage Back Securities And Collateralized Mortgage Obligations [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                 5metr_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		 28metr_NumberOfSecuritiesSold
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		  
Investment securities, fair value 30,900,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		       98,500,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		       30,900,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		 98,500,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		  
Net gains (losses) on sales/calls of securities                   512,000us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CorporateDebtMortgageBackSecuritiesAndCollateralizedMortgageObligationsMember		  
Collateralized mortgage obligations [Member]                      
Investment Securities [Line Items]                      
Number of securities, type                 28metr_InvestmentPortfolioNumberOfSecuritiesByType
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		    
Mortgage Backed Securities, Other [Member]                      
Investment Securities [Line Items]                      
Number of securities, type                 4metr_InvestmentPortfolioNumberOfSecuritiesByType
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesOtherMember		    
Government Agency Debentures [Member]                      
Investment Securities [Line Items]                      
Net gains (losses) on sales/calls of securities                   152,000us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_GovernmentAgencyDebenturesMember		  
Investment securities, value called by issuing agency                   50,000,000metr_InvestmentSecuritiesValueCalledbyIssuingAgency
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_GovernmentAgencyDebenturesMember		  
Number of Securities Called at Par                 0metr_NumberOfSecuritiesCalledAtPar
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_GovernmentAgencyDebenturesMember		 2metr_NumberOfSecuritiesCalledAtPar
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_GovernmentAgencyDebenturesMember		 11metr_NumberOfSecuritiesCalledAtPar
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_GovernmentAgencyDebenturesMember
Municipal Bonds [Member]                      
Investment Securities [Line Items]                      
Number of securities, type                 5metr_InvestmentPortfolioNumberOfSecuritiesByType
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		    
Corporate debentures [Member]                      
Investment Securities [Line Items]                      
Number of Securities Called at Par                     1metr_NumberOfSecuritiesCalledAtPar
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Agency and Corporate Debentures [Member]                      
Investment Securities [Line Items]                      
Net gains (losses) on sales/calls of securities                     0us-gaap_GainLossOnSaleOfSecuritiesNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AgencyAndCorporateDebenturesMember
Investment securities, value called by issuing agency                     160,300,000metr_InvestmentSecuritiesValueCalledbyIssuingAgency
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AgencyAndCorporateDebenturesMember
U.S. Government agency securities [Member]                      
Investment Securities [Line Items]                      
Number of securities, type                 11metr_InvestmentPortfolioNumberOfSecuritiesByType
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Securities Pledged as Collateral [Member]                      
Investment Securities [Line Items]                      
Securities pledged to secure public deposits and other 698,800,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember		       691,300,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember		       698,800,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember		 691,300,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember		  
Available-for-sale Securities [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   16metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 41metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Investment securities, fair value         76,300,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		         76,300,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember		 299,300,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Available-for-sale Securities [Member] | Mortgage Backed Securities, Other [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   2metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesOtherMember		  
Available-for-sale Securities [Member] | Private-label CMOs [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                     8metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_PrivateLabelCollateralizedMortgageObligationsMember
Securities, held to maturity, fair value                     20,100,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_PrivateLabelCollateralizedMortgageObligationsMember
Available-for-sale Securities [Member] | Collateralized Mortgage Obligations [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   14metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		  
Held-to-maturity Securities [Member]                      
Investment Securities [Line Items]                      
Investment securities, fair value         12,200,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember		         12,200,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember		  
Held-to-maturity Securities [Member] | Amortizing Securities, Returned At Least 85% of Principal [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                 1metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AmortizingSecuritiesReturnedAtLeast85OfPrincipalMember		    
Investment Securities, Return on Principal, Percentage                 85.00%metr_InvestmentSecuritiesReturnOnPrincipalPercentage
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AmortizingSecuritiesReturnedAtLeast85OfPrincipalMember		    
Securities, held to maturity, fair value 614,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AmortizingSecuritiesReturnedAtLeast85OfPrincipalMember		               614,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_AmortizingSecuritiesReturnedAtLeast85OfPrincipalMember		    
Held-to-maturity Securities [Member] | Mortgage Backed Securities, Other [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   10metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesOtherMember		 7metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesOtherMember
Securities, held to maturity, fair value                     6,100,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesOtherMember
Held-to-maturity Securities [Member] | Collateralized Mortgage Obligations [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   1metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember		  
Held-to-maturity Securities [Member] | Bonds [Member]                      
Investment Securities [Line Items]                      
Number of securities sold                   1metr_NumberOfSecuritiesSold
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_BondsMember		  
Investment securities, fair value         $ 10,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_BondsMember		         $ 10,000,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_BondsMember		  
Maximum [Member]                      
Investment Securities [Line Items]                      
Held to maturity securities, ratio of remaining par value to original purchases par value (less than)                   15.00%metr_HeldToMaturitySecuritiesRatioOfRemainingParValueToOriginalPurchasesParValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 15.00%metr_HeldToMaturitySecuritiesRatioOfRemainingParValueToOriginalPurchasesParValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember