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Acquisitions (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 9 Months Ended |  | 0 Months Ended | 9 Months Ended
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Jan. 10, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 Community Bank [Member] | Sep. 30, 2013 Community Bank [Member] | Jan. 10, 2013 Community Bank [Member] | Dec. 31, 2012 Community Bank [Member] | Jan. 10, 2013 Community Bank [Member] Western Virginia [Member] branch | Jan. 10, 2013 Community Bank [Member] Virginia Beach [Member] branch | Sep. 30, 2012 Virginia Savings Bank [Member] | Sep. 30, 2012 Virginia Savings Bank [Member] | Sep. 30, 2013 Virginia Savings Bank [Member] | Dec. 31, 2012 Virginia Savings Bank [Member] | May 31, 2012 Virginia Savings Bank [Member] branch | Sep. 30, 2013 Virginia Savings Bank And Community Financial [Member] | Dec. 31, 2012 Virginia Savings Bank And Community Financial [Member] | Jan. 10, 2013 Warrant [Member] Community Bank [Member] | Sep. 30, 2013 Employee Severance [Member] Community Bank [Member] | Sep. 30, 2012 Employee Severance [Member] Virginia Savings Bank [Member] | Sep. 30, 2013 Professional Fees [Member] Community Bank [Member] | Sep. 30, 2012 Professional Fees [Member] Virginia Savings Bank [Member] | Sep. 30, 2013 Data Processing Costs [Member] Community Bank [Member] | Sep. 30, 2012 Data Processing Costs [Member] Virginia Savings Bank [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding common and preferred stock |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Number of branches acquired |  |  |  |  |  |  |  |  |  |  |  | 8 | 2 |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Assets |  | $ 3,396,688,000 |  | $ 3,396,688,000 |  | $ 2,917,466,000 |  |  |  | $ 460,000,000 |  |  |  |  |  |  |  | $ 132,000,000 |  |  |  |  |  |  |  |  |
Gross loans |  | 2,558,456,000 |  | 2,558,456,000 |  | 2,146,369,000 |  | 288,117,000 | 288,117,000 | 410,000,000 | 0 |  |  |  |  | 52,640,000 | 65,219,000 | 82,000,000 | 340,757,000 | 65,219,000 |  |  |  |  |  |  |
Deposits |  | 2,807,536,000 |  | 2,807,536,000 |  | 2,409,316,000 |  |  |  | 380,000,000 |  |  |  |  |  |  |  | 120,000,000 |  |  |  |  |  |  |  |  |
Shareholders equity |  | 378,042,000 | 328,415,000 | 378,042,000 | 328,415,000 | 333,274,000 | 311,134,000 |  |  | 53,000,000 |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |
Number of shares received by Community shareholders for each share of Community Financial | 0.1753 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction purchase price |  | 53,641,000 |  | 53,641,000 |  |  |  |  |  | 41,246,000 |  |  |  |  |  |  |  | 12,395,000 |  |  |  |  |  |  |  |  |
Cash |  | 17,410,000 |  | 17,410,000 |  |  |  |  |  | 12,738,000 |  |  |  |  |  |  |  | 4,672,000 |  |  |  |  |  |  |  |  |
Number of common stock shares issued |  |  |  |  |  |  |  |  |  | 767,000 |  |  |  |  |  |  |  | 240,000 |  |  |  |  |  |  |  |  |
Common stock valued |  | 35,506,000 |  | 35,506,000 |  |  |  |  |  | 27,783,000 |  |  |  |  |  |  |  | 7,723,000 |  |  |  |  |  |  |  |  |
Closing price of common stock at acquisition |  |  |  |  |  |  |  |  |  | $ 36.23 |  |  |  |  |  |  |  | $ 32.18 |  |  |  |  |  |  |  |  |
Number of shares to purchase through warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,565 |  |  |  |  |  |
Exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.8 |  |  |  |  |  |
Original warrant expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Revised warrant expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |
Goodwill |  | 17,530,000 |  | 17,530,000 |  |  |  |  |  | 9,289,000 |  |  |  |  |  |  |  | 8,241,000 |  |  |  |  |  |  |  |  |
Core deposit intangible |  | 3,984,000 |  | 3,984,000 |  |  |  |  |  | 2,711,000 |  |  |  |  |  |  |  | 1,273,000 |  |  |  |  |  |  |  |  |
Premium on time deposits |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |
Premium on time deposits amortization period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization time period for core deposit intangible assets |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core deposit annual charge (less than 0.7 million) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |
Merger related costs (less than 0.1 million) |  | $ (150,000) | $ 157,000 | $ 5,455,000 | $ 4,335,000 |  |  | $ 100,000 | $ 5,500,000 |  |  |  |  | $ 200,000 | $ 4,300,000 |  |  |  |  |  |  | $ 2,500,000 | $ 900,000 | $ 1,400,000 | $ 900,000 | $ 1,100,000 | $ 2,300,000

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