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 6 Months Ended
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
Loans
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 3 6 6 7
Recorded Investment $ 352 $ 481 $ 2,021 $ 1,755
Real estate loans [Member] | Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans     1  
Recorded Investment     309  
Real estate loans [Member] | Hotel/Motel [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans     1  
Recorded Investment     996  
Real estate loans [Member] | Gas station [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans       1
Recorded Investment       1,274
Real estate loans [Member] | Other [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans   1 1 1
Recorded Investment   140 364 140
Commercial and industrial loans [Member] | Commercial term [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 2 5 2 5
Recorded Investment 212 341 212 341
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 1   1  
Recorded Investment $ 140   $ 140