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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

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