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Allowance for Loan Losses and Recorded Investment in Loans , Excluding PCI Loans, by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment $ 28,517 $ 19,478
Allowance for Loans Individually Evaluated 5,282 4,742
Collectively Evaluated Impairment 1,626,453 1,609,532
Allowance for Loans Collectively Evaluated 18,023 18,580
Commercial Loans
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 21,988 12,156
Allowance for Loans Individually Evaluated 4,419 3,955
Collectively Evaluated Impairment 879,846 866,002
Allowance for Loans Collectively Evaluated 11,920 12,135
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 56,996 46,404
Allowance for Loans Collectively Evaluated 1,293 1,141
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,235 5,189
Allowance for Loans Individually Evaluated 3,504 3,794
Collectively Evaluated Impairment 91,317 92,612
Allowance for Loans Collectively Evaluated 1,312 1,421
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,601  
Allowance for Loans Individually Evaluated 500  
Collectively Evaluated Impairment 71,451 71,669
Allowance for Loans Collectively Evaluated 1,216 1,211
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 784 664
Allowance for Loans Individually Evaluated 38 47
Collectively Evaluated Impairment 138,357 136,567
Allowance for Loans Collectively Evaluated 3,431 3,502
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 10,017 5,952
Allowance for Loans Individually Evaluated 377 114
Collectively Evaluated Impairment 486,594 483,126
Allowance for Loans Collectively Evaluated 4,411 4,536
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 2,255 2,488
Allowance for Loans Collectively Evaluated 19 23
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 351 351
Collectively Evaluated Impairment 32,876 33,136
Allowance for Loans Collectively Evaluated 238 301
Consumer Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 6,529 7,322
Allowance for Loans Individually Evaluated 863 787
Collectively Evaluated Impairment 670,444 668,215
Allowance for Loans Collectively Evaluated 5,530 5,810
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 462 472
Allowance for Loans Individually Evaluated 171 52
Collectively Evaluated Impairment 137,869 136,896
Allowance for Loans Collectively Evaluated 1,289 1,309
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 6,067 6,850
Allowance for Loans Individually Evaluated 692 735
Collectively Evaluated Impairment 498,010 502,229
Allowance for Loans Collectively Evaluated 4,029 4,295
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 34,565 29,090
Allowance for Loans Collectively Evaluated 212 206
Consumer and Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 76,163 75,315
Allowance for Loans Collectively Evaluated 573 635
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 72,195 71,389
Allowance for Loans Collectively Evaluated 573 635
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment $ 3,968 $ 3,926