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Troubled Debt Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing $ 1,111     $ 1,111   $ 1,141
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 6,943     6,943   8,456
Impaired Financing Receivable, Trouble Debt Structuring, Total 8,054     8,054   9,597
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 747     747   994
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts 5 4   10 6  
Financing Receivable, Modification, Pre-Modification Recorded Investment 3,212   3,077 8,676 4,175  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 2,263   2,793 6,492 3,604  
Financing Receivable, Modifications, Subsequent Default [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0   1 1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0   2,386 204  
Commercial and Industrial Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 195     195   216
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0     0   0
Impaired Financing Receivable, Trouble Debt Structuring, Total 195     195   216
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 0     0   0
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts   1     1  
Financing Receivable, Modification, Pre-Modification Recorded Investment   507     507  
Financing Receivable, Modifications, Post-Modifications Recorded Investment   240     240  
Construction And Land Development Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 3,858     3,858   5,095
Impaired Financing Receivable, Trouble Debt Structuring, Total 3,858     3,858   5,095
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 366     366   147
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts   1   2 1  
Financing Receivable, Modification, Pre-Modification Recorded Investment   493   2,842 493  
Financing Receivable, Modifications, Post-Modifications Recorded Investment   476   1,753 476  
Financing Receivable, Modifications, Subsequent Default [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0     1    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment       2,386    
Commercial Real Estate Owner Occupied Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 916     916   925
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,404     1,404   1,172
Impaired Financing Receivable, Trouble Debt Structuring, Total 2,320     2,320   2,097
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 151     151   420
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts 3 1   4 3  
Financing Receivable, Modification, Pre-Modification Recorded Investment 2,349 848   3,167 1,946  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 1,406 848   2,225 1,659  
Commercial Real Estate Other Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 450     450   1,806
Impaired Financing Receivable, Trouble Debt Structuring, Total 450     450   1,806
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 0     0   264
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts   1   2 1  
Financing Receivable, Modification, Pre-Modification Recorded Investment   1,229   1,804 1,229  
Financing Receivable, Modifications, Post-Modifications Recorded Investment   1,229   1,657 1,229  
Commercial Real Estate Loans, Total [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 916     916   925
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,854     1,854   2,978
Impaired Financing Receivable, Trouble Debt Structuring, Total 2,770     2,770   3,903
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 151     151   684
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts 3 2   6 4  
Financing Receivable, Modification, Pre-Modification Recorded Investment 2,349 2,077   4,971 3,175  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 1,406 2,077   3,882 2,888  
Residential Real Estate Consumer Mortgage Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 856     856   0
Impaired Financing Receivable, Trouble Debt Structuring, Total 856     856   0
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 49     49   0
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts 2     2    
Financing Receivable, Modification, Pre-Modification Recorded Investment 863     863    
Financing Receivable, Modifications, Post-Modifications Recorded Investment 857     857    
Financing Receivable, Modifications, Subsequent Default [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0     1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   0     204  
Residential Real Estate Investment Property Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 375     375   383
Impaired Financing Receivable, Trouble Debt Structuring, Total 375     375   383
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 181     181   163
Residential Real Estate Loans, Total [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,231     1,231   383
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,231     1,231   383
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 230     230   163
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modification, Number of Contracts 2     2    
Financing Receivable, Modification, Pre-Modification Recorded Investment 863     863    
Financing Receivable, Modifications, Post-Modifications Recorded Investment 857     857    
Financing Receivable, Modifications, Subsequent Default [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0     1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   0     204  
Consumer Installment and Revolving Loans [Member]
            
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]            
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0     0   0
Impaired Financing Receivable, Trouble Debt Structuring, Total 0     0   0
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses $ 0     $ 0   $ 0