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Investment in Loans Related to Each Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment $ 28,805 $ 23,202
Allowance for Loans Individually Evaluated 6,401 5,593
Loans Collectively Evaluated for Impairment 1,539,871 1,560,111
Allowance for Loans Collectively Evaluated 18,441 20,169
Acquired Impaired Loans Evaluated for Impairment 120,616 139,362
Allowance for Acquired Impaired Loans Evaluated 8 8
Commercial Loans
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 23,150 17,753
Allowance for Loans Individually Evaluated 5,571 4,426
Loans Collectively Evaluated for Impairment 826,585 833,381
Allowance for Loans Collectively Evaluated 11,672 12,833
Acquired Impaired Loans Evaluated for Impairment 60,815 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 6,812 2,916
Allowance for Loans Individually Evaluated 1,822  
Loans Collectively Evaluated for Impairment 58,022 55,369
Allowance for Loans Collectively Evaluated 885 1,214
Acquired Impaired Loans Evaluated for Impairment 14,881 25,744
Commercial Loans | Commercial and Industrial
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 4,013 3,602
Allowance for Loans Individually Evaluated 3,100 3,192
Loans Collectively Evaluated for Impairment 89,818 88,540
Allowance for Loans Collectively Evaluated 1,002 1,159
Acquired Impaired Loans Evaluated for Impairment 3,040 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 445 378
Allowance for Loans Individually Evaluated 15 18
Loans Collectively Evaluated for Impairment 65,407 67,278
Allowance for Loans Collectively Evaluated 1,486 1,612
Acquired Impaired Loans Evaluated for Impairment 626 649
Commercial Loans | Single-family Non-owner Occupied
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 2,345 2,794
Allowance for Loans Individually Evaluated 204 858
Loans Collectively Evaluated for Impairment 135,636 134,323
Allowance for Loans Collectively Evaluated 3,303 3,509
Acquired Impaired Loans Evaluated for Impairment 9,025 10,223
Commercial Loans | Non-farm, Non-residential
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 9,358 8,063
Allowance for Loans Individually Evaluated 430 358
Loans Collectively Evaluated for Impairment 441,359 451,240
Allowance for Loans Collectively Evaluated 4,595 4,901
Acquired Impaired Loans Evaluated for Impairment 32,366 38,072
Commercial Loans | Agricultural
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 2,244 1,852
Allowance for Loans Collectively Evaluated 24 22
Acquired Impaired Loans Evaluated for Impairment 1 1
Commercial Loans | Farmland Loan
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 177  
Loans Collectively Evaluated for Impairment 34,099 34,779
Allowance for Loans Collectively Evaluated 372 416
Acquired Impaired Loans Evaluated for Impairment 876 882
Consumer Real Estate
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 5,655 5,449
Allowance for Loans Individually Evaluated 830 1,167
Loans Collectively Evaluated for Impairment 639,019 640,027
Allowance for Loans Collectively Evaluated 6,172 6,739
Acquired Impaired Loans Evaluated for Impairment 59,041 59,447
Consumer Real Estate | Home Equity Lines
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 543 499
Allowance for Loans Individually Evaluated 222 223
Loans Collectively Evaluated for Impairment 137,680 139,706
Allowance for Loans Collectively Evaluated 1,265 1,351
Acquired Impaired Loans Evaluated for Impairment 50,625 50,343
Consumer Real Estate | Single Family Owner Occupied
    
Financing Receivable, Recorded Investment [Line Items]    
Non-acquired Loans Individually Evaluated for Impairment 5,112 4,950
Allowance for Loans Individually Evaluated 608 944
Loans Collectively Evaluated for Impairment 481,047 483,559
Allowance for Loans Collectively Evaluated 4,586 5,051
Acquired Impaired Loans Evaluated for Impairment 7,320 8,005
Consumer Real Estate | Owner occupied construction
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 20,292 16,768
Allowance for Loans Collectively Evaluated 321 337
Acquired Impaired Loans Evaluated for Impairment 1,096 1,099
Consumer and Other
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 74,267 86,703
Allowance for Loans Collectively Evaluated 597 597
Acquired Impaired Loans Evaluated for Impairment 760 800
Consumer and Other | Consumer Loan
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 70,664 81,037
Allowance for Loans Collectively Evaluated 516 597
Acquired Impaired Loans Evaluated for Impairment 760 800
Consumer and Other | Other
    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 3,603 5,666
Allowance for Loans Collectively Evaluated $ 81