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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loan (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due $ 47,000 $ 919,000  
Total past due loans 60 - 89 Days Past Due 0 190,000  
Total past due loans Greater Than 89 Days Past Due 3,356,000 5,008,000  
Total Past Due 3,403,000 6,117,000  
Current 1,072,084,000 1,035,072,000  
Total Loans 1,075,487,000 1,041,189,000 1,035,288,000
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 22,000 80,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 631,000 871,000  
Total Past Due 653,000 951,000  
Current 286,234,000 284,371,000  
Total Loans 286,887,000 285,322,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial Vacant Land, Land Development, and Residential Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 0 289,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 85,000 614,000  
Total Past Due 85,000 903,000  
Current 40,656,000 47,196,000  
Total Loans 40,741,000 48,099,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial Real Estate - Owner Occupied [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 0 199,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 53,000 1,337,000  
Total Past Due 53,000 1,536,000  
Current 258,603,000 257,741,000  
Total Loans 258,656,000 259,277,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial Real Estate - Non-Owner Occupied [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 0 303,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 1,860,000 1,123,000  
Total Past Due 1,860,000 1,426,000  
Current 366,441,000 323,460,000  
Total Loans 368,301,000 324,886,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial Real Estate - Multi-Family and Residential Rental [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 0 0  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 264,000 613,000  
Total Past Due 264,000 613,000  
Current 52,914,000 50,309,000  
Total Loans 53,178,000 50,922,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Commercial Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 22,000 871,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 2,893,000 4,558,000  
Total Past Due 2,915,000 5,429,000  
Current 1,004,848,000 963,077,000  
Total Loans 1,007,763,000 968,506,000 957,411,000
Recorded Balance greater than 89 Days and Accruing 0 0  
Retail Home Equity and Other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 0 1,000  
Total past due loans 60 - 89 Days Past Due 0 0  
Total past due loans Greater Than 89 Days Past Due 0 13,000  
Total Past Due 0 14,000  
Current 36,575,000 38,903,000  
Total Loans 36,575,000 38,917,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Retail 1-4 Family Mortgages [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 25,000 47,000  
Total past due loans 60 - 89 Days Past Due 0 190,000  
Total past due loans Greater Than 89 Days Past Due 463,000 437,000  
Total Past Due 488,000 674,000  
Current 30,661,000 33,092,000  
Total Loans 31,149,000 33,766,000  
Recorded Balance greater than 89 Days and Accruing 0 0  
Retail Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total past due loans 30 - 59 Days Past Due 25,000 48,000  
Total past due loans 60 - 89 Days Past Due 0 190,000  
Total past due loans Greater Than 89 Days Past Due 463,000 450,000  
Total Past Due 488,000 688,000  
Current 67,236,000 71,995,000  
Total Loans 67,724,000 72,683,000 77,877,000
Recorded Balance greater than 89 Days and Accruing $ 0 $ 0