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Loans Modified As Troubled Debt Restructurings Excluding on Nonaccrual Status (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Contract
Dec. 31, 2011
Contract
Financing Receivable, Modifications [Line Items]    
Total Contracts 4 10
Pre-Modification Recorded Investment $ 7,292 $ 1,791
Post-Modification Recorded Investment 6,141 1,768
Below Market Interest Rate
    
Financing Receivable, Modifications [Line Items]    
Total Contracts   3
Pre-Modification Recorded Investment   532
Post-Modification Recorded Investment   532
Below Market Interest Rate | Non-farm Non-residential Loan
    
Financing Receivable, Modifications [Line Items]    
Total Contracts   1
Pre-Modification Recorded Investment   373
Post-Modification Recorded Investment   373
Below Market Interest Rate | Single Family Owner Occupied
    
Financing Receivable, Modifications [Line Items]    
Total Contracts   2
Pre-Modification Recorded Investment   159
Post-Modification Recorded Investment   159
Extended Payment Terms
    
Financing Receivable, Modifications [Line Items]    
Total Contracts 2 2
Pre-Modification Recorded Investment 1,470 393
Post-Modification Recorded Investment 319 393
Extended Payment Terms | Non-farm Non-residential Loan
    
Financing Receivable, Modifications [Line Items]    
Total Contracts 1 1
Pre-Modification Recorded Investment 1,119 126
Post-Modification Recorded Investment   126
Extended Payment Terms | Single Family Owner Occupied
    
Financing Receivable, Modifications [Line Items]    
Total Contracts 1 1
Pre-Modification Recorded Investment 351 267
Post-Modification Recorded Investment 319 267
Below Market Interest Rate And Extended Payment Term
    
Financing Receivable, Modifications [Line Items]    
Total Contracts 2 5
Pre-Modification Recorded Investment 5,822 866
Post-Modification Recorded Investment 5,822 843
Below Market Interest Rate And Extended Payment Term | Non-farm Non-residential Loan
    
Financing Receivable, Modifications [Line Items]    
Total Contracts 2 1
Pre-Modification Recorded Investment 5,822 107
Post-Modification Recorded Investment 5,822 107
Below Market Interest Rate And Extended Payment Term | Single Family Owner Occupied
    
Financing Receivable, Modifications [Line Items]    
Total Contracts   4
Pre-Modification Recorded Investment   759
Post-Modification Recorded Investment   $ 736