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Loans - Allowance for Loan Losses Disaggregated on the Basis of Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment $ 21,658 $ 20,596 $ 18,040  
Loans collectively evaluated for impairment 73,498 71,842 75,549  
Ending balance 95,156 92,438 93,589 104,453
Commercial and Industrial [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment 19,838 16,682 13,464  
Loans collectively evaluated for impairment 37,216 36,108 37,621  
Ending balance 57,054 52,790 51,085 54,164
Commercial Real Estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment 1,820 3,914 4,576  
Loans collectively evaluated for impairment 19,200 18,676 20,233  
Ending balance 21,020 22,590 24,809 29,346
Consumer Real Estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment 0 0 0  
Loans collectively evaluated for impairment 4,533 5,230 5,148  
Ending balance 4,533 5,230 5,148 5,252
Consumer and Other [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment 0 0 0  
Loans collectively evaluated for impairment 5,691 5,010 3,724  
Ending balance 5,691 5,010 3,724 3,507
Unallocated [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans individually evaluated for impairment 0 0 0  
Loans collectively evaluated for impairment 6,858 6,818 8,823  
Ending balance $ 6,858 $ 6,818 $ 8,823 $ 12,184