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Loans Receivable and Allowance for Loan Losses (Credit Quality Indicators for Commercial Loans, by Loan Type) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans $ 1,659,247us-gaap_LoansAndLeasesReceivableCommercial $ 1,660,688us-gaap_LoansAndLeasesReceivableCommercial
Commercial and industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 536,349us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember		 525,127us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
Commercial tax-exempt [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 67,176us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember		 71,151us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
Owner occupied real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 311,259us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember		 332,070us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
Commercial construction and land development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 137,063us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember		 138,064us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
Commercial real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 607,400us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember		 594,276us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Pass Rated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 1,578,737us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,574,075us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass Rated Loans [Member] | Commercial and industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 488,040us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 473,984us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass Rated Loans [Member] | Commercial tax-exempt [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 67,176us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 71,151us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass Rated Loans [Member] | Owner occupied real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 293,499us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 311,668us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass Rated Loans [Member] | Commercial construction and land development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 133,494us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 133,033us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass Rated Loans [Member] | Commercial real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 596,528us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 584,239us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 24,645us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 26,827us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial and industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 17,454us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 20,785us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial tax-exempt [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Owner occupied real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 4,238us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 4,268us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial construction and land development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 187us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 190us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention [Member] | Commercial real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 2,766us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,584us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard Accrual [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 27,677us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 31,684us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Accrual [Member] | Commercial and industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 18,480us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 18,724us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Accrual [Member] | Commercial tax-exempt [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Accrual [Member] | Owner occupied real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 7,312us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 8,718us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Accrual [Member] | Commercial construction and land development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 141us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 1,613us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Accrual [Member] | Commercial real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 1,744us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 2,629us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard Nonaccrual [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 28,188us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 28,102us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember
Substandard Nonaccrual [Member] | Commercial and industrial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 12,375us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 11,634us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember
Substandard Nonaccrual [Member] | Commercial tax-exempt [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 0us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialTaxExemptMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember
Substandard Nonaccrual [Member] | Owner occupied real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 6,210us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 7,416us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_OwnerOccupiedRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember
Substandard Nonaccrual [Member] | Commercial construction and land development [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans 3,241us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 3,228us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= metr_CommercialConstructionAndLandDevelopmentMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember
Substandard Nonaccrual [Member] | Commercial real estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Credit exposure for commercial loans $ 6,362us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember		 $ 5,824us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= metr_SubstandardNonaccrualMember