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Acquisitions (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jan. 10, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Community Bank [Member]
Jun. 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
Jun. 30, 2013
Virginia Savings Bank [Member]
Jun. 30, 2013
Virginia Savings Bank [Member]
Dec. 31, 2012
Virginia Savings Bank [Member]
May 31, 2012
Virginia Savings Bank [Member]
branch
Jun. 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]
Jun. 30, 2013
Employee Severance [Member]
Community Bank [Member]
Jun. 30, 2013
Employee Severance [Member]
Virginia Savings Bank [Member]
Jun. 30, 2013
Professional Fees [Member]
Community Bank [Member]
Jun. 30, 2013
Professional Fees [Member]
Virginia Savings Bank [Member]
Jun. 30, 2013
Data Processing Costs [Member]
Community Bank [Member]
Jun. 30, 2013
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   $ 3,382,550,000   $ 3,382,550,000   $ 2,917,466,000       $ 460,000,000             $ 132,000,000                  
Gross loans   2,527,445,000 2,146,369,000 2,527,445,000 2,146,369,000 2,146,369,000   330,214,000 330,214,000 410,000,000 0     57,294,000 57,294,000 65,219,000 82,000,000 387,508,000 65,219,000              
Deposits   2,835,950,000   2,835,950,000   2,409,316,000       380,000,000             120,000,000                  
Shareholders equity   368,891,000 320,622,000 368,891,000 320,622,000 333,274,000 311,134,000     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 shares to purchase through warrant                                       61,565            
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                  
Exercise price per share                                       $ 30.8            
Original warrant expiration period                                       10 years            
Revised warrant expiration period                                       6 years            
Premium on time deposits                   1,100,000             2,300,000                  
Premium on time deposits amortization period       5 years                                            
Core deposit intangible   3,984,000   3,984,000           2,711,000             1,273,000                  
Core deposit annual charge, maximum                                   700,000                
Amortization time period for core deposit intangible assets       10 years                                            
Merger related costs   $ 65,000 $ 4,042,000 $ 5,604,000 $ 4,177,000     $ 100,000 $ 5,600,000         $ 4,000,000 $ 4,200,000           $ 2,600,000 $ 900,000 $ 1,400,000 $ 900,000 $ 1,200,000 $ 2,300,000