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Troubled Debt Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]          
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing $ 1,088   $ 1,088   $ 1,141
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 6,608   6,608   8,456
Impaired Financing Receivable, Trouble Debt Structuring, Total 7,696   7,696   9,597
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 312   312   994
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 2 5 12 11  
Financing Receivable, Modification, Pre-Modification Recorded Investment 2,513 5,362 11,190 9,538  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 2,492 5,349 8,985 8,952  
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 184   184   216
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0   0   0
Impaired Financing Receivable, Trouble Debt Structuring, Total 184   184   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   2  
Financing Receivable, Modification, Pre-Modification Recorded Investment   283   791  
Financing Receivable, Modifications, Post-Modifications Recorded Investment   283   523  
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 3,756   3,756   5,095
Impaired Financing Receivable, Trouble Debt Structuring, Total 3,756   3,756   5,095
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 141   141   147
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 1 2 3 3  
Financing Receivable, Modification, Pre-Modification Recorded Investment 2,138 4,432 4,981 4,925  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 2,119 4,419 3,873 4,894  
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 904   904   925
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,379   1,379   1,172
Impaired Financing Receivable, Trouble Debt Structuring, Total 2,283   2,283   2,097
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 139   139   420
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 0 1 4 4  
Financing Receivable, Modification, Pre-Modification Recorded Investment 0 256 3,167 2,202  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 0 256 2,225 1,915  
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 441   441   1,806
Impaired Financing Receivable, Trouble Debt Structuring, Total 441   441   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   0 2 1  
Financing Receivable, Modification, Pre-Modification Recorded Investment   0 1,804 1,229  
Financing Receivable, Modifications, Post-Modifications Recorded Investment   0 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 904   904   925
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,820   1,820   2,978
Impaired Financing Receivable, Trouble Debt Structuring, Total 2,724   2,724   3,903
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 139   139   684
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 0 1 6 5  
Financing Receivable, Modification, Pre-Modification Recorded Investment 0 256 4,971 3,431  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 0 256 3,882 3,144  
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 838   838   0
Impaired Financing Receivable, Trouble Debt Structuring, Total 838   838   0
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 32   32   0
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 0   2    
Financing Receivable, Modification, Pre-Modification Recorded Investment 0   863    
Financing Receivable, Modifications, Post-Modifications Recorded Investment 0   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 194   194   383
Impaired Financing Receivable, Trouble Debt Structuring, Total 194   194   383
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 0   0   163
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 1 1 1 1  
Financing Receivable, Modification, Pre-Modification Recorded Investment 375 391 375 391  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 373 391 373 391  
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 1,032   1,032   383
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,032   1,032   383
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 32   32   163
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modification, Number of Contracts 1 1 3 1  
Financing Receivable, Modification, Pre-Modification Recorded Investment 375 391 1,238 391  
Financing Receivable, Modifications, Post-Modifications Recorded Investment 373 391 1,230 391  
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