Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail)

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Loans - Troubled Debt Restructurings, Disaggregated by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
SecurityLoan
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 6 8 11 12
Pre-Modification Outstanding Recorded Investment $ 2,588 $ 815 $ 4,057 $ 2,658
Post-Modification Outstanding Recorded Investment 2,450 787 3,865 2,268
Consumer loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans    1    1
Pre-Modification Outstanding Recorded Investment   149   149
Post-Modification Outstanding Recorded Investment   149   149
Real estate loans [Member] | Retail [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1    1   
Pre-Modification Outstanding Recorded Investment 2,002   2,002  
Post-Modification Outstanding Recorded Investment 1,882   1,882  
Real estate loans [Member] | Other [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1 1 2 1
Pre-Modification Outstanding Recorded Investment 65 148 1,011 153
Post-Modification Outstanding Recorded Investment 62 140 1,005 140
Real estate loans [Member] | Residential property [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1    1   
Pre-Modification Outstanding Recorded Investment 316   317  
Post-Modification Outstanding Recorded Investment 313   313  
Commercial and industrial loans [Member] | Commercial term [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans 2 6 5 8
Pre-Modification Outstanding Recorded Investment 59 518 327 772
Post-Modification Outstanding Recorded Investment 53 498 287 699
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1    2   
Pre-Modification Outstanding Recorded Investment 146   400  
Post-Modification Outstanding Recorded Investment 140   378  
Commercial and industrial loans [Member] | International loans [Member]
        
Financing Receivable, Modifications [Line Items]        
Number of Loans        2
Pre-Modification Outstanding Recorded Investment       1,584
Post-Modification Outstanding Recorded Investment       $ 1,280