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Allowance for Loan Losses and Recorded Investment in Loans , Excluding PCI Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment $ 19,478 $ 23,202
Allowance for Loans Individually Evaluated 4,742 5,593
Collectively Evaluated Impairment 1,609,532 1,562,360
Allowance for Loans Collectively Evaluated 18,580 20,169
Commercial Loans
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 12,156 17,753
Allowance for Loans Individually Evaluated 3,955 4,564
Collectively Evaluated Impairment 866,002 833,652
Allowance for Loans Collectively Evaluated 12,135 12,695
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment   2,916
Collectively Evaluated Impairment 46,404 55,369
Allowance for Loans Collectively Evaluated 1,141 1,214
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,189 3,602
Allowance for Loans Individually Evaluated 3,794 3,192
Collectively Evaluated Impairment 92,612 88,811
Allowance for Loans Collectively Evaluated 1,421 1,159
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment   378
Allowance for Loans Individually Evaluated   18
Collectively Evaluated Impairment 71,669 67,278
Allowance for Loans Collectively Evaluated 1,211 1,612
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 664 2,794
Allowance for Loans Individually Evaluated 47 996
Collectively Evaluated Impairment 136,567 134,323
Allowance for Loans Collectively Evaluated 3,502 3,371
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,952 8,063
Allowance for Loans Individually Evaluated 114 358
Collectively Evaluated Impairment 483,126 451,240
Allowance for Loans Collectively Evaluated 4,536 4,901
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 2,488 1,852
Allowance for Loans Collectively Evaluated 23 22
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 351  
Collectively Evaluated Impairment 33,136 34,779
Allowance for Loans Collectively Evaluated 301 416
Consumer Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 7,322 5,449
Allowance for Loans Individually Evaluated 787 1,029
Collectively Evaluated Impairment 668,215 642,005
Allowance for Loans Collectively Evaluated 5,810 6,877
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 472 499
Allowance for Loans Individually Evaluated 52 223
Collectively Evaluated Impairment 136,896 141,684
Allowance for Loans Collectively Evaluated 1,309 1,351
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 6,850 4,950
Allowance for Loans Individually Evaluated 735 806
Collectively Evaluated Impairment 502,229 483,553
Allowance for Loans Collectively Evaluated 4,295 5,189
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 29,090 16,768
Allowance for Loans Collectively Evaluated 206 337
Consumer and Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 75,315 86,703
Allowance for Loans Collectively Evaluated 635 597
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment 71,389 81,037
Allowance for Loans Collectively Evaluated 635 597
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Collectively Evaluated Impairment $ 3,926 $ 5,666