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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
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment $ 22,473 $ 19,478
Allowance for Loans Individually Evaluated 1,673 4,742
Collectively Evaluated Impairment 1,674,914 1,609,532
Allowance for Loans Collectively Evaluated 19,282 18,580
Commercial Loans
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 17,312 12,156
Allowance for Loans Individually Evaluated 1,169 3,955
Collectively Evaluated Impairment 910,783 866,002
Allowance for Loans Collectively Evaluated 12,502 12,135
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 52,809 46,404
Allowance for Loans Collectively Evaluated 1,189 1,141
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 1,258 5,189
Allowance for Loans Individually Evaluated   3,794
Collectively Evaluated Impairment 89,680 92,612
Allowance for Loans Collectively Evaluated 1,064 1,421
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,567  
Allowance for Loans Individually Evaluated 500  
Collectively Evaluated Impairment 95,666 71,669
Allowance for Loans Collectively Evaluated 1,786 1,211
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 637 664
Allowance for Loans Individually Evaluated 46 47
Collectively Evaluated Impairment 144,344 136,567
Allowance for Loans Collectively Evaluated 3,299 3,502
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 9,850 5,952
Allowance for Loans Individually Evaluated 623 114
Collectively Evaluated Impairment 493,317 483,126
Allowance for Loans Collectively Evaluated 4,910 4,536
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 2,300 2,488
Allowance for Loans Collectively Evaluated 18 23
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment   351
Collectively Evaluated Impairment 32,667 33,136
Allowance for Loans Collectively Evaluated 236 301
Consumer Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,161 7,322
Allowance for Loans Individually Evaluated 504 787
Collectively Evaluated Impairment 685,487 668,215
Allowance for Loans Collectively Evaluated 6,153 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 136,429 136,896
Allowance for Loans Collectively Evaluated 1,346 1,309
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,161 6,850
Allowance for Loans Individually Evaluated 504 735
Collectively Evaluated Impairment 503,846 502,229
Allowance for Loans Collectively Evaluated 4,503 4,295
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 45,212 29,090
Allowance for Loans Collectively Evaluated 304 206
Consumer and Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 78,644 75,315
Allowance for Loans Collectively Evaluated 627 635
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 71,336 71,389
Allowance for Loans Collectively Evaluated 627 635
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment $ 7,308 $ 3,926