Quarterly report pursuant to Section 13 or 15(d)

Loans - Non-Accrual Loans, Disaggregated by Loan Class (Detail)

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Loans - Non-Accrual Loans, Disaggregated by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans $ 25,381 $ 25,877
Real estate loans [Member] | Retail [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 2,802 2,946
Real estate loans [Member] | Hotel/Motel [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 3,631 5,200
Real estate loans [Member] | Gas station [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 5,356 2,492
Real estate loans [Member] | Other [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 4,369 4,808
Real estate loans [Member] | Residential property [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 1,162 1,365
Commercial and industrial loans [Member] | Commercial term [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 5,965 7,146
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans 521 423
Consumer loans [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual loans $ 1,575 $ 1,497