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Loans (Troubled Debt Restructurings) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Contract
Dec. 31, 2012
Contract
Dec. 31, 2010
Contract
Dec. 31, 2009
Contract
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments $ 10,513 $ 8,255    
Post-Modification Outstanding Recorded Investments 10,553 8,243    
Recorded Investment 8,877 6,715    
Number of troubled debt restructured loan defaulted 1      
Amount of troubled debt restructured loan defaulted 237      
Forbearance Agreement, Number Of Negotiations 1 3 2 1
Nonaccruing [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 3,059 3,342    
Post-Modification Outstanding Recorded Investments 3,047 3,330    
Recorded Investment 1,549 1,900    
Nonaccruing [Member] | Commercial and industrial [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 490 490    
Post-Modification Outstanding Recorded Investments 485 485    
Recorded Investment 178 187    
Nonaccruing [Member] | Commercial real estate [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 1,021 1,304    
Post-Modification Outstanding Recorded Investments 1,021 1,304    
Recorded Investment 677 953    
Nonaccruing [Member] | Commercial real estate construction [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 1,548 1,548    
Post-Modification Outstanding Recorded Investments 1,541 1,541    
Recorded Investment 694 760    
Accruing [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 7,454 4,913    
Post-Modification Outstanding Recorded Investments 7,506 4,913    
Recorded Investment 7,328 4,815    
Accruing [Member] | Commercial real estate [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 7,118 4,577    
Post-Modification Outstanding Recorded Investments 7,170 4,577    
Recorded Investment 7,014 4,494    
Accruing [Member] | Residential mortgage [Member]
       
Financing Receivable, Modifications [Line Items]        
Pre-Modification Outstanding Recorded Investments 336 336    
Post-Modification Outstanding Recorded Investments 336 336    
Recorded Investment $ 314 $ 321