Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2014
Accounting Policies [Abstract]
Consolidated Financial Statements	Consolidated Financial Statements The consolidated balance sheet at December 31, 2013 has been derived from audited consolidated financial statements and the consolidated interim financial statements included herein have been prepared without audit pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. These consolidated financial statements were prepared in accordance with GAAP for interim financial statements and with instructions for Form 10-Q and Regulation S-X Section 210.10-01. Further information on Metro Bancorp, Inc.'s (Metro or the Company) accounting policies are available in Note 1 (Significant Accounting Policies) of the Notes to Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013. The accompanying consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary to reflect a fair statement of the results for the interim periods presented. Such adjustments are of a normal, recurring nature. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2013. Events occurring subsequent to the balance sheet date through the date of issuance have been evaluated for potential recognition or disclosure in the consolidated financial statements. The results for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. The consolidated financial statements include the accounts of the Company and its consolidated subsidiaries including Metro Bank (the Bank). All material intercompany transactions have been eliminated.
Use of Estimates	Use of Estimates The consolidated financial statements are prepared in conformity with GAAP. Accounting principles generally accepted in the United States of America require management to make estimates and assumptions that affect reported amounts of assets and liabilities and require disclosure of contingent assets and liabilities. In the opinion of management, all adjustments considered necessary for fair presentation have been included and are of a normal, recurring nature. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses (allowance or ALL), impaired loans, the valuation of foreclosed assets, the valuation of securities available for sale, the valuation of deferred tax assets, the determination of other-than-temporary impairment (OTTI) on the Company's investment securities portfolio and other fair value measurements.
Recent Accounting Standards	Recent Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606)(“ASU 2014-09”), which specifies how and when to recognize revenue and includes additional disclosures. ASU 2014-09 will be effective for financial statements issued for the first interim period within annual reporting periods beginning after December 15, 2016, and does not permit early adoption. We will adopt ASU 2014-09 in the first quarter of 2017 and are currently evaluating the impact it will have on our Financial Statements. In July 2013, FASB issued guidance on the presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry forward, a Similar Tax Loss, or a Tax Credit Carry forward exists. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carry forward, a similar tax loss, or a tax credit carry forward, except as follows: to the extent a net operating loss carry forward, a similar tax loss, or a tax credit carry forward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The effective date of this update for public entities is for fiscal years and interim periods that began after December 15, 2013. The adoption of this guidance did not have a material impact on our consolidated financial statements. In January 2014, FASB clarified the Receivables – Troubled Debt Restructurings by Creditors guidance regarding Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The guidance clarifies when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and the real estate property recognized. The effective date of the adoption of this guidance is for interim and annual reporting periods beginning after December 15, 2014. We do not believe the adoption of the amendment to this guidance will have a material impact on our consolidated financial statements.
Reclassifications	Reclassifications Certain amounts in the 2013 financial statements have been reclassified to conform to the 2014 presentation format. Such reclassifications had no impact on the Company's net operations and stockholders' equity.

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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