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Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Contract
Sep. 30, 2012
Contract
Sep. 30, 2013
Contract
Sep. 30, 2012
Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 5 6 14 17
Financing Receivable Modification, Pre-Modification Recorded Principal Balance $ 1,070,000 $ 18,175,000 $ 9,233,000 $ 24,871,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 1,070,000 18,170,000 9,233,000 24,863,000
Commercial and industrial [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 1 1 2 6
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 553,000 133,000 613,000 850,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 553,000 128,000 613,000 843,000
Vacant land, land development and residential construction [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 0 0 2 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0 3,247,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 0 0 3,247,000 0
Real estate - owner occupied [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 0 0 3 5
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0 909,000 1,588,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 0 0 909,000 1,587,000
Real estate - non-owner occupied [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 2 5 4 6
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 171,000 18,042,000 2,239,000 22,433,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 171,000 18,042,000 2,239,000 22,433,000
Real estate - multi-family and residential rental [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 2 0 2 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 346,000 0 346,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 346,000 0 346,000 0
Commercial Loans [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 5 6 13 17
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 1,070,000 18,175,000 7,354,000 24,871,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 1,070,000 18,170,000 7,354,000 24,863,000
Home equity and other [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 0 0 0 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0 0 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 0 0 0 0
1 - 4 family mortgages [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 0 0 1 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0 1,879,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 0 0 1,879,000 0
Retail Loans [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable Modification, Number of Contracts 0 0 1 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0 1,879,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance $ 0 $ 0 $ 1,879,000 $ 0