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Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Contract
Dec. 31, 2012
Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 10 29
Financing Receivable Modification, Pre-Modification Recorded Principal Balance $ 7,231,000 $ 32,089,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 7,231,000 32,084,000
Commercial and industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 3 8
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 741,000 1,357,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 741,000 1,353,000
Vacant land, land development and residential construction [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 2 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 3,610,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 3,610,000 0
Real estate - owner occupied [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 2 6
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 715,000 1,745,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 715,000 1,744,000
Real estate - non-owner occupied [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 1 15
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 45,000 28,987,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 45,000 28,987,000
Real estate - multi-family and residential rental [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 1 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 241,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 241,000 0
Commercial Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 9 29
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 5,352,000 32,089,000
Financing Receivable Modification, Post-Modification Recorded Principal Balance 5,352,000 32,084,000
Home equity and other [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 0 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 0 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 0 0
1 - 4 family mortgages [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 1 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 1,879,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance 1,879,000 0
Retail Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable Modification, Number of Contracts 1 0
Financing Receivable Modification, Pre-Modification Recorded Principal Balance 1,879,000 0
Financing Receivable Modification, Post-Modification Recorded Principal Balance $ 1,879,000 $ 0