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Investment in Loans Related to Each Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment $ 29,655 $ 23,202
Allowance for Loans Individually Evaluated 4,835 5,593
Loans Collectively Evaluated for Impairment 1,552,166 1,560,111
Allowance for Loans Collectively Evaluated 18,279 20,169
Acquired Impaired Loans Evaluated for Impairment 109,677 139,362
Allowance for Acquired Impaired Loans Evaluated 8 8
Commercial Loans
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 23,280 17,753
Allowance for Loans Individually Evaluated 4,020 4,426
Loans Collectively Evaluated for Impairment 836,302 833,381
Allowance for Loans Collectively Evaluated 11,853 12,833
Acquired Impaired Loans Evaluated for Impairment 52,906 79,115
Allowance for Acquired Impaired Loans Evaluated 8 8
Commercial Loans | Construction Development And Other Land
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 5,441 2,916
Allowance for Loans Individually Evaluated 164  
Loans Collectively Evaluated for Impairment 57,788 55,369
Allowance for Loans Collectively Evaluated 1,483 1,214
Acquired Impaired Loans Evaluated for Impairment 12,036 25,744
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 5,428 3,602
Allowance for Loans Individually Evaluated 3,285 3,192
Loans Collectively Evaluated for Impairment 89,627 88,540
Allowance for Loans Collectively Evaluated 1,343 1,159
Acquired Impaired Loans Evaluated for Impairment 1,805 3,544
Allowance for Acquired Impaired Loans Evaluated 8 8
Commercial Loans | Multi-family Residential
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 20 378
Allowance for Loans Individually Evaluated   18
Loans Collectively Evaluated for Impairment 61,330 67,278
Allowance for Loans Collectively Evaluated 1,086 1,612
Acquired Impaired Loans Evaluated for Impairment 620 649
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 2,040 2,794
Allowance for Loans Individually Evaluated 179 858
Loans Collectively Evaluated for Impairment 133,829 134,323
Allowance for Loans Collectively Evaluated 3,353 3,509
Acquired Impaired Loans Evaluated for Impairment 8,088 10,223
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 9,990 8,063
Allowance for Loans Individually Evaluated 392 358
Loans Collectively Evaluated for Impairment 456,938 451,240
Allowance for Loans Collectively Evaluated 4,242 4,901
Acquired Impaired Loans Evaluated for Impairment 29,496 38,072
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 2,424 1,852
Allowance for Loans Collectively Evaluated 27 22
Acquired Impaired Loans Evaluated for Impairment   1
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 361  
Loans Collectively Evaluated for Impairment 34,366 34,779
Allowance for Loans Collectively Evaluated 319 416
Acquired Impaired Loans Evaluated for Impairment 861 882
Consumer Real Estate
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 6,367 5,449
Allowance for Loans Individually Evaluated 815 1,167
Loans Collectively Evaluated for Impairment 641,125 640,027
Allowance for Loans Collectively Evaluated 5,843 6,739
Acquired Impaired Loans Evaluated for Impairment 56,053 59,447
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 876 499
Allowance for Loans Individually Evaluated 222 223
Loans Collectively Evaluated for Impairment 137,651 139,706
Allowance for Loans Collectively Evaluated 1,346 1,351
Acquired Impaired Loans Evaluated for Impairment 48,425 50,343
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 5,441 4,950
Allowance for Loans Individually Evaluated 593 944
Loans Collectively Evaluated for Impairment 481,714 483,553
Allowance for Loans Collectively Evaluated 4,317 5,051
Acquired Impaired Loans Evaluated for Impairment 6,524 8,005
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 50  
Loans Collectively Evaluated for Impairment 21,760 16,768
Allowance for Loans Collectively Evaluated 180 337
Acquired Impaired Loans Evaluated for Impairment 1,104 1,099
Consumer and Other
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 8  
Loans Collectively Evaluated for Impairment 74,739 86,703
Allowance for Loans Collectively Evaluated 583 597
Acquired Impaired Loans Evaluated for Impairment 718 800
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 8  
Loans Collectively Evaluated for Impairment 70,987 81,037
Allowance for Loans Collectively Evaluated 583 597
Acquired Impaired Loans Evaluated for Impairment 718 800
Consumer and Other | Other
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment $ 3,752 $ 5,666