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Company's Investment in Loans Held for Investment by Internal Credit Grade Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements $ 1,533,272 $ 1,517,547
Covered under loss share agreements 163,425 207,106
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 55,791 57,434
Covered under loss share agreements 17,979 26,595
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 95,972 88,738
Covered under loss share agreements 3,951 6,948
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 56,079 65,694
Covered under loss share agreements 2,003 2,611
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 132,253 135,912
Covered under loss share agreements 8,142 11,428
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 455,247 448,810
Covered under loss share agreements 37,751 48,565
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,274 1,709
Covered under loss share agreements 176 144
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 31,885 34,570
Covered under loss share agreements 1,014 1,091
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 109,611 111,081
Covered under loss share agreements 71,724 81,445
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 492,424 473,547
Covered under loss share agreements 19,253 22,961
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 25,349 16,223
Covered under loss share agreements 1,306 1,644
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 71,679 78,163
Covered under loss share agreements 126 3,674
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,708 5,666
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,411,984 1,362,219
Covered under loss share agreements 64,013 81,453
Pass | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 46,431 41,850
Covered under loss share agreements 10,183 6,463
Pass | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 87,129 77,573
Covered under loss share agreements 3,299 6,225
Pass | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 53,093 60,161
Covered under loss share agreements 1,476 1,962
Pass | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 118,079 112,562
Covered under loss share agreements 4,471 6,065
Pass | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 417,892 399,907
Covered under loss share agreements 15,536 23,855
Pass | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,252 1,657
Covered under loss share agreements 176 143
Pass | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 26,974 28,887
Covered under loss share agreements 676 935
Pass | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 104,582 104,750
Covered under loss share agreements 15,378 16,323
Pass | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 455,194 436,587
Covered under loss share agreements 12,489 16,011
Pass | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 25,349 15,841
Covered under loss share agreements 203 484
Pass | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 70,313 76,787
Covered under loss share agreements 126 2,987
Pass | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,696 5,657
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 37,163 45,835
Covered under loss share agreements 18,963 23,735
Special Mention | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,371 1,497
Covered under loss share agreements 1,292 2,120
Special Mention | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,338 2,506
Covered under loss share agreements 400 445
Special Mention | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,262 4,043
Special Mention | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,455 5,938
Covered under loss share agreements 1,645 2,223
Special Mention | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 15,729 15,975
Covered under loss share agreements 4,835 5,477
Special Mention | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 11 19
Special Mention | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,695 2,262
Special Mention | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,384 2,739
Covered under loss share agreements 10,690 11,981
Special Mention | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 8,018 9,599
Covered under loss share agreements 82 927
Special Mention | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements   382
Covered under loss share agreements 19  
Special Mention | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 898 867
Covered under loss share agreements   562
Special Mention | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2 8
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 78,152 103,624
Covered under loss share agreements 80,129 101,228
Substandard | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 7,007 13,546
Covered under loss share agreements 6,423 17,834
Substandard | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,550 4,821
Covered under loss share agreements 218 197
Substandard | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 724 1,490
Covered under loss share agreements 527 649
Substandard | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 9,579 16,092
Covered under loss share agreements 2,007 3,015
Substandard | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 21,253 32,808
Covered under loss share agreements 17,340 19,189
Substandard | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 11 33
Covered under loss share agreements   1
Substandard | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,216 3,421
Covered under loss share agreements 338 156
Substandard | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,125 3,592
Covered under loss share agreements 45,632 53,116
Substandard | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 29,212 27,319
Covered under loss share agreements 6,560 5,786
Substandard | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Covered under loss share agreements 1,084 1,160
Substandard | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 465 501
Covered under loss share agreements   125
Substandard | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 10 1
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 5,973 5,827
Covered under loss share agreements 320 690
Doubtful | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 982 541
Covered under loss share agreements 81 178
Doubtful | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,955 3,838
Covered under loss share agreements 34 81
Doubtful | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 140 1,320
Covered under loss share agreements 19 125
Doubtful | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 373 120
Covered under loss share agreements 40 44
Doubtful | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 520  
Covered under loss share agreements 24 25
Doubtful | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Covered under loss share agreements 122 237
Doubtful | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3 8
Loss
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements   42
Loss | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements   $ 42