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Income Taxes Income Taxes (Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
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
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]                      
Provision (benefit) at statutory rate on pretax income (loss)                 $ 10,579us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 8,601us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,533us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax-exempt income on loans and investments                 (1,417)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,498)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,390)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Stock-based compensation                 111us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 162us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 203us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Civil money penalty                 0metr_IncomeTaxReconciliationCivilMoneyPenalty 0metr_IncomeTaxReconciliationCivilMoneyPenalty 525metr_IncomeTaxReconciliationCivilMoneyPenalty
Other                 (132)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 51us-gaap_IncomeTaxReconciliationOtherReconcilingItems 43us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total $ 2,559us-gaap_IncomeTaxExpenseBenefit $ 2,507us-gaap_IncomeTaxExpenseBenefit $ 2,288us-gaap_IncomeTaxExpenseBenefit $ 1,787us-gaap_IncomeTaxExpenseBenefit $ 2,091us-gaap_IncomeTaxExpenseBenefit $ 2,064us-gaap_IncomeTaxExpenseBenefit $ 1,725us-gaap_IncomeTaxExpenseBenefit $ 1,436us-gaap_IncomeTaxExpenseBenefit $ 9,141us-gaap_IncomeTaxExpenseBenefit $ 7,316us-gaap_IncomeTaxExpenseBenefit $ 4,914us-gaap_IncomeTaxExpenseBenefit