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Acquisitions (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Jun. 30, 2011
Maximum [Member]
Roger Bank N.A. [Member]
Jun. 30, 2011
Minimum [Member]
Roger Bank N.A. [Member]
Jun. 30, 2011
Monroe Bancorp [Member]
Jun. 30, 2010
Monroe Bancorp [Member]
Jun. 30, 2011
Monroe Bancorp [Member]
Jun. 30, 2010
Monroe Bancorp [Member]
Mar. 31, 2011
Monroe Bancorp [Member]
Dec. 31, 2010
Monroe Bancorp [Member]
Jun. 30, 2011
Integra [Member]
Jun. 30, 2011
Roger Bank N.A. [Member]
Percentage of interest acquired                       100.00%    
Number of banking centers                       15    
Number of shares received     7,600,000                      
Value of shares received     $ 90,100,000                      
Total estimated purchase price             11,156,000   11,156,000          
Net tangible assets acquired 10,500,000 10,500,000         10,485,000   10,485,000          
Revenue             101,380,000 111,850,000 203,982,000 220,476,000        
Net income             15,601,000 14,102,000 33,250,000 26,798,000        
Provision expense             (3,207,000) (11,221,000) (6,519,000) (20,502,000)        
Acquisition and integration-related costs 2,169                          
Provision expense tax rate       38.87%                    
Assets under management                         328,000,000  
Total acquisition-related transaction 90,070,000 90,070,000         90,070,000   90,070,000       4,400,000,000  
Cash transaction payments                         1,300,000  
Anticipated acquisition-related costs   5,700                     150,000  
Customer relationship intangibles 1,300,000 1,300,000                 2,300,000   1,300,000  
Assets acquired                           1,900,000,000
Assumed liabilities                           1,600,000,000
Deposits acquired                           1,500,000,000
Loss sharing agreements amount, 80% on assets acquired                           275,000,000
Zero percent for losses on acquisition         275.0 467,200,000                
Accelerated amortization of intangible assets, period 12 12                        
80% reimbursement for loss on acquisition                           467,200,000
Estimated loss on acquisition                           269,000,000
Estimated reimbursement amount                           $ 211,200,000