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Securities (Amortized cost and fair value of debt securities by contractrual maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale Securities    
Securities available for sale, amortized cost $ 487,818us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 533,999us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale securities, fair value 486,025us-gaap_AvailableForSaleSecurities 528,038us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities    
Securities held to maturity, amortized cost 323,082us-gaap_HeldToMaturitySecurities 324,994us-gaap_HeldToMaturitySecurities
Securities held to maturity, fair value 323,056us-gaap_HeldToMaturitySecuritiesFairValue 319,923us-gaap_HeldToMaturitySecuritiesFairValue
Debt Securities [Member]    
Held-to-maturity Securities    
Due in one year or less, amortized cost 5,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after one year through five years, amortized cost 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after five years through ten years, amortized cost 111,383us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after ten years, amortized cost 47,437us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Securities held to maturity, amortized cost 163,820us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due in one year or less, fair value 5,041us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after one year through five years, fair value 0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after five years through ten years, fair value 109,332us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Due after ten years, fair value 47,748us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Securities held to maturity, fair value 162,121us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Residential mortgage-backed securities [Member]    
Held-to-maturity Securities    
Securities held to maturity, amortized cost 12,281us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 14,226us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Securities held to maturity, fair value 12,593us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 14,706us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Agency CMOs [Member]    
Held-to-maturity Securities    
Securities held to maturity, amortized cost 146,981us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= metr_CollateralizedByAgencyMember		 146,952us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= metr_CollateralizedByAgencyMember
Securities held to maturity, fair value 148,342us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= metr_CollateralizedByAgencyMember		 145,890us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= metr_CollateralizedByAgencyMember
Debt Securities [Member]    
Available-for-sale Securities    
Due in one year or less, amortized cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after one year through five years, amortized cost 6,741us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after five years through ten years, amortized cost 50,144us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after ten years, amortized cost 7,099us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Securities available for sale, amortized cost 63,984us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due in one year or less, fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after one year through five years, fair value 6,790us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after five years through ten years, fair value 49,903us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Due after ten years, fair value 7,084us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Available-for-sale securities, fair value 63,777us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember		  
Residential mortgage-backed securities [Member]    
Available-for-sale Securities    
Securities available for sale, amortized cost 58,453us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 60,196us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Available-for-sale securities, fair value 58,729us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 60,149us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Agency CMOs [Member]    
Available-for-sale Securities    
Securities available for sale, amortized cost 365,381us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CollateralizedByAgencyMember		 409,823us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CollateralizedByAgencyMember
Available-for-sale securities, fair value $ 363,519us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CollateralizedByAgencyMember		 $ 405,009us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= metr_CollateralizedByAgencyMember