Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail)

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Loans - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
SecurityLoan
Mar. 31, 2013
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 7 10
Recorded Investment $ 2,080 $ 2,256
Real estate loans [Member] | Retail [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Recorded Investment 310   
Real estate loans [Member] | Hotel/Motel [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Recorded Investment 1,000   
Real estate loans [Member] | Gas station [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 1
Recorded Investment 87 1,306
Real estate loans [Member] | Other [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 2   
Recorded Investment 481   
Commercial and industrial loans [Member] | Commercial term [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1 8
Recorded Investment 53 762
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans    1
Recorded Investment   188
Consumer loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1   
Recorded Investment $ 149