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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
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment $ 24,389 $ 19,478
Allowance for Loans Individually Evaluated 4,851 4,742
Collectively Evaluated Impairment 1,666,208 1,609,532
Allowance for Loans Collectively Evaluated 18,642 18,580
Commercial Loans
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 20,666 12,156
Allowance for Loans Individually Evaluated 4,334 3,955
Collectively Evaluated Impairment 910,218 866,002
Allowance for Loans Collectively Evaluated 12,413 12,135
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 56,208 46,404
Allowance for Loans Collectively Evaluated 1,279 1,141
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 3,914 5,189
Allowance for Loans Individually Evaluated 3,137 3,794
Collectively Evaluated Impairment 92,695 92,612
Allowance for Loans Collectively Evaluated 1,311 1,421
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,585  
Allowance for Loans Individually Evaluated 500  
Collectively Evaluated Impairment 84,313 71,669
Allowance for Loans Collectively Evaluated 1,429 1,211
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 369 664
Allowance for Loans Individually Evaluated 30 47
Collectively Evaluated Impairment 142,091 136,567
Allowance for Loans Collectively Evaluated 3,292 3,502
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 10,453 5,952
Allowance for Loans Individually Evaluated 667 114
Collectively Evaluated Impairment 499,461 483,126
Allowance for Loans Collectively Evaluated 4,850 4,536
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 2,596 2,488
Allowance for Loans Collectively Evaluated 22 23
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 345 351
Collectively Evaluated Impairment 32,854 33,136
Allowance for Loans Collectively Evaluated 230 301
Consumer Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 3,723 7,322
Allowance for Loans Individually Evaluated 517 787
Collectively Evaluated Impairment 674,436 668,215
Allowance for Loans Collectively Evaluated 5,606 5,810
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment   472
Allowance for Loans Individually Evaluated   52
Collectively Evaluated Impairment 136,739 136,896
Allowance for Loans Collectively Evaluated 1,258 1,309
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 3,723 6,850
Allowance for Loans Individually Evaluated 517 735
Collectively Evaluated Impairment 497,285 502,229
Allowance for Loans Collectively Evaluated 4,098 4,295
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 40,412 29,090
Allowance for Loans Collectively Evaluated 250 206
Consumer and Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 81,554 75,315
Allowance for Loans Collectively Evaluated 623 635
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 74,185 71,389
Allowance for Loans Collectively Evaluated 623 635
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment $ 7,369 $ 3,926