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Allowance for Loan Losses (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Total ending allowance balance $ 19,565 $ 18,270 $ 18,270 $ 18,882
Total ending loans balance 10,078   9,037  
Allowance for Loan Losses [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Allowance For Loan Losses, Individually evaluated for impairment 1,945 1,945    
Allowance For Loan Losses, Collectively evaluated for impairment 17,620 16,325    
Total ending allowance balance 19,565 18,270    
Loans [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Loans: Individually evaluated for impairment 10,054 10,597    
Loans: Collectively evaluated for impairment 1,083,176 1,183,637    
Total ending loans balance 1,093,230 1,194,234    
Commercial [Member] | Allowance for Loan Losses [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Allowance For Loan Losses, Individually evaluated for impairment 1,945 1,945    
Allowance For Loan Losses, Collectively evaluated for impairment 7,221 5,826    
Total ending allowance balance 9,166 7,771    
Commercial [Member] | Loans [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Loans: Individually evaluated for impairment 10,054 10,597    
Loans: Collectively evaluated for impairment 464,369 451,243    
Total ending loans balance 474,423 461,840    
Real estate [Member] | Allowance for Loan Losses [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Allowance For Loan Losses, Collectively evaluated for impairment 3,477 3,204    
Total ending allowance balance 3,477 3,204    
Real estate [Member] | Loans [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Loans: Collectively evaluated for impairment 191,954 190,292    
Total ending loans balance 191,954 190,292    
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Allowance For Loan Losses, Collectively evaluated for impairment 1,603 1,705    
Total ending allowance balance 1,603 1,705    
Mortgage Warehousing [Member] | Loans [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Loans: Collectively evaluated for impairment 144,089 251,928    
Total ending loans balance 144,089 251,928    
Consumer [Member] | Allowance for Loan Losses [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Allowance For Loan Losses, Collectively evaluated for impairment 5,319 5,590    
Total ending allowance balance 5,319 5,590    
Consumer [Member] | Loans [Member]
       
Allowance for loan losses and the recorded investment in loans by portfolio segment        
Loans: Collectively evaluated for impairment 282,764 290,174    
Total ending loans balance $ 282,764 $ 290,174