Loans and Allowance for Loan Losses - Schedule of Number of Loans Modified Troubled Debt Restructuring by Loan Portfolio (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
SecurityLoan
Dec. 31, 2012
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 40 24
Pre-Modification Outstanding Principal Balance $ 12,025 $ 14,054
Post-Modification Principal Balance 7,666 12,516
Subsequent default number of loans 6 10
Recorded Investment 1,639 7,563
Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 10 10
Pre-Modification Outstanding Principal Balance 7,551 11,267
Post-Modification Principal Balance 3,837 9,988
Subsequent default number of loans 2 6
Recorded Investment 566 7,062
Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 17 4
Pre-Modification Outstanding Principal Balance 1,375 596
Post-Modification Principal Balance 1,067 586
Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 9 6
Pre-Modification Outstanding Principal Balance 2,683 1,811
Post-Modification Principal Balance 2,418 1,586
Subsequent default number of loans 4 2
Recorded Investment 1,073 433
Commercial Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 4 4
Pre-Modification Outstanding Principal Balance 416 380
Post-Modification Principal Balance 344 356
Commercial Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Subsequent default number of loans   2
Recorded Investment   $ 68