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 9 Months Ended
Sep. 30, 2014
SecurityLoan
Sep. 30, 2013
SecurityLoan
Sep. 30, 2014
SecurityLoan
Sep. 30, 2013
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 5 1 6 2
Recorded Investment $ 2,315 $ 130 $ 2,449 $ 159
Real estate loans [Member] | Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 1   1  
Recorded Investment 1,856   1,856  
Real estate loans [Member] | Other [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans   1   1
Recorded Investment   130   130
Commercial and industrial loans [Member] | Commercial term [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 2   2 1
Recorded Investment 47   47 29
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 2   3  
Recorded Investment $ 412   $ 546