Loans and Allowance for Loan Losses - Schedule of Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 42,501 $ 54,220
Interest Income Recognized 1,573 2,529
Interest Income Received 1,601 2,582
Construction, Land Development and Other Land Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 10,249 18,283
Interest Income Recognized 177 546
Interest Income Received 179 598
Secured by 1-4 Family Residential Properties [Member]
   
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 303 146
Interest Income Recognized 7 10
Interest Income Received 7 9
Secured by Multi-family Residential Properties [Member]
   
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 8,690 4,942
Interest Income Recognized 438 483
Interest Income Received 446 455
Secured by Non-farm, Non-residential Properties [Member]
   
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 22,272 29,627
Interest Income Recognized 918 1,452
Interest Income Received 935 1,478
Commercial and Industrial Loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 987 1,222
Interest Income Recognized 33 38
Interest Income Received $ 34 $ 42