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Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Commercial and Industrial Loans [Member]
Dec. 31, 2011
Commercial and Industrial Loans [Member]
Dec. 31, 2012
Construction And Land Development Loans [Member]
Dec. 31, 2011
Construction And Land Development Loans [Member]
Dec. 31, 2012
Commercial Real Estate Owner Occupied Loans [Member]
Dec. 31, 2011
Commercial Real Estate Owner Occupied Loans [Member]
Dec. 31, 2012
Commercial Real Estate Other Loans [Member]
Dec. 31, 2011
Commercial Real Estate Other Loans [Member]
Dec. 31, 2012
Commercial Real Estate Loans, Total [Member]
Dec. 31, 2011
Commercial Real Estate Loans, Total [Member]
Dec. 31, 2012
Residential Real Estate Consumer Mortgage Loans [Member]
Dec. 31, 2011
Residential Real Estate Consumer Mortgage Loans [Member]
Dec. 31, 2012
Residential Real Estate Investment Property Loans [Member]
Dec. 31, 2011
Residential Real Estate Investment Property Loans [Member]
Dec. 31, 2012
Residential Real Estate Loans, Total [Member]
Dec. 31, 2011
Residential Real Estate Loans, Total [Member]
Dec. 31, 2012
Consumer Installment and Revolving Loans [Member]
Dec. 31, 2011
Consumer Installment and Revolving Loans [Member]
Dec. 31, 2012
Total For Impaired Loans [Member]
Dec. 31, 2011
Total For Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]                                              
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance       $ 169 $ 216 $ 2,879 $ 3,958 $ 787 $ 361 $ 7,914 $ 655 $ 8,701 $ 1,016 $ 971 $ 0 $ 508 $ 0 $ 1,479 $ 0 $ 0 $ 0 $ 13,228 $ 5,190
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied       0 0 (1,682) (1,572) (212) (11) (1,862) (50) (2,074) (61) (152) 0 (110) 0 (262) 0 0 0 (4,018) (1,633)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment       169 216 1,197 2,386 575 350 6,052 605 6,627 955 819 0 398 0 1,217 0 0 0 9,210 3,557
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance       0 0 471 2,882 899 2,255 0 1,242 899 3,497 0 1,707 0 390 0 2,097 0 0 1,370 8,476
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied       0 0 (45) (173) 0 (29) 0 (41) 0 (70) 0 (797) 0 (7) 0 (804) 0 0 (45) (1,047)
Impaired Financing Receivable, with Related Allowance, Recorded Investment       0 0 426 2,709 899 2,226 0 1,201 899 3,427 0 910 0 383 0 1,293 0 0 1,325 7,429
Impaired Financing Receivable, With Related Allowance, Related Allowance       0 0 129 147 134 544 0 264 134 808 0 103 0 163 0 266 0 0 263 1,221
Impaired Financing Receivable, Unpaid Principal Balance   14,598 13,666                                        
Impaired Financing Receivable, Charge-off And Payments Applied   (4,063) (2,680)                                        
Impaired Financing Receivable, Recorded Investment   10,535 10,986                                        
Impaired Financing Receivable, Related Allowance   263 1,221                                        
Impaired Financing Receivable, Average Recorded Investment [Abstract]                                              
Impaired Financing Receivable, Average Recorded Investment 9,200     194 316 3,888 4,136 2,449 1,828 2,621 2,374 5,070 4,202 861 1,376 652 146 1,513 1,522 0 0 10,665 10,176
Impaired Financing Receivable, Interest Income, Accrual Method       $ 13 $ 9 $ 0 $ 0 $ 64 $ 24 $ 0 $ 0 $ 64 $ 24 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 77 $ 33