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Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans, Payment Default (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Contract
Mar. 31, 2013
Contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts 19 [1] 28 [1]
Recorded Investment $ 171 [1] $ 314 [1]
Commercial Real Estate [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts      [1]
Recorded Investment    [1]  
Commercial and Industrial [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   1 [1]
Recorded Investment   33 [1]
Total Commercial Loans and Leases [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   1 [1]
Recorded Investment   33 [1]
Direct Installment [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 18 [1] 21 [1]
Recorded Investment 171 [1] 170 [1]
Residential Mortgages [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts   2 [1]
Recorded Investment   93 [1]
Indirect Installment [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1 [1] 4 [1]
Recorded Investment   18 [1]
Consumer Lines of Credit [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts      [1]
Recorded Investment    [1]  
[1] The recorded investment is as of period end.