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Loans and Allowance for Loan Losses - Allowance Related to Loans Categorized as Troubled Debt Restructurings (Detail) (USD $)
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total $ 25,195,000 $ 24,947,000 $ 28,677,000 $ 27,762,000 $ 29,689,000 $ 36,532,000
Commercial Loans [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 22,654,000 22,382,000 26,043,000 24,894,000 26,471,000 33,431,000
Retail Loans [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 2,498,000 2,559,000 2,645,000 2,827,000 3,167,000 3,019,000
Financing Receivable Troubled Debt Restructuring [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 14,164,000   13,097,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial and Industrial [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 619,000   772,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial Vacant Land, Land Development, and Residential Construction [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 1,208,000   713,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial Real Estate - Owner Occupied [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 893,000   1,116,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 9,639,000   9,751,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial Real Estate - Multi-Family and Residential Rental [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 885,000   745,000      
Financing Receivable Troubled Debt Restructuring [Member] | Commercial Loans [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 13,244,000   13,097,000      
Financing Receivable Troubled Debt Restructuring [Member] | Home equity and other [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 0   0      
Financing Receivable Troubled Debt Restructuring [Member] | 1 - 4 family mortgages [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total 920,000   0      
Financing Receivable Troubled Debt Restructuring [Member] | Retail Loans [Member]
            
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]            
Total $ 920,000   $ 0