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
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans $ 24,003 $ 25,877
Real estate loans [Member] | Retail [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 2,062 2,946
Real estate loans [Member] | Hotel/Motel [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 3,051 5,200
Real estate loans [Member] | Gas station [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 5,208 2,492
Real estate loans [Member] | Other [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 3,674 4,808
Real estate loans [Member] | Residential property [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 1,516 1,365
Commercial and industrial loans [Member] | Commercial term [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 6,060 7,146
Commercial and industrial loans [Member] | Commercial lines of credit [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans 674 423
Consumer loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total non-accrual Non-PCI loans $ 1,758 $ 1,497