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Loans Modified as Troubled Debt Restructurings by Loan Class for which there was Payment Default (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Contract
Sep. 30, 2013
Contract
Sep. 30, 2014
Contract
Sep. 30, 2013
Contract
Financing Receivable, Modifications [Line Items]        
Total Contracts 2 1 2 1
Pre-Modification Recorded Investment $ 312 $ 978 $ 312 $ 978
Commercial Loans | Non-farm, Non-residential
       
Financing Receivable, Modifications [Line Items]        
Total Contracts   1   1
Pre-Modification Recorded Investment   978   978
Consumer Real Estate | Single Family Owner Occupied
       
Financing Receivable, Modifications [Line Items]        
Total Contracts 2   2  
Pre-Modification Recorded Investment $ 312   $ 312