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Company's Investment in Loans Held for Investment by Internal Credit Grade Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements $ 1,507,422 $ 1,517,547
Covered under loss share agreements 184,076 207,106
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 52,198 57,434
Covered under loss share agreements 23,067 26,595
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 92,448 88,738
Covered under loss share agreements 4,412 6,948
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 59,536 65,694
Covered under loss share agreements 2,434 2,611
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 134,207 135,912
Covered under loss share agreements 9,750 11,428
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 455,224 448,810
Covered under loss share agreements 41,200 48,565
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,393 1,709
Covered under loss share agreements 31 144
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 34,354 34,570
Covered under loss share agreements 1,234 1,091
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 109,820 111,081
Covered under loss share agreements 77,132 81,445
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 473,212 473,547
Covered under loss share agreements 20,467 22,961
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 21,276 16,223
Covered under loss share agreements 1,638 1,644
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 69,002 78,163
Covered under loss share agreements 2,711 3,674
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,752 5,666
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,380,388 1,362,219
Covered under loss share agreements 74,247 81,453
Pass | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 40,067 41,850
Covered under loss share agreements 12,194 6,463
Pass | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 82,560 77,573
Covered under loss share agreements 3,619 6,225
Pass | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 54,602 60,161
Covered under loss share agreements 1,814 1,962
Pass | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 117,582 112,562
Covered under loss share agreements 4,806 6,065
Pass | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 420,792 399,907
Covered under loss share agreements 17,692 23,855
Pass | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,367 1,657
Covered under loss share agreements 31 143
Pass | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 28,806 28,887
Covered under loss share agreements 828 935
Pass | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 103,983 104,750
Covered under loss share agreements 16,502 16,323
Pass | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 436,893 436,587
Covered under loss share agreements 14,314 16,011
Pass | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 21,276 15,841
Covered under loss share agreements 380 484
Pass | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 67,721 76,787
Covered under loss share agreements 2,067 2,987
Pass | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,739 5,657
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 38,130 45,835
Covered under loss share agreements 16,150 23,735
Special Mention | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,916 1,497
Covered under loss share agreements 1,388 2,120
Special Mention | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,888 2,506
Covered under loss share agreements 418 445
Special Mention | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,118 4,043
Special Mention | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 5,024 5,938
Covered under loss share agreements 93 2,223
Special Mention | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 11,864 15,975
Covered under loss share agreements 2,605 5,477
Special Mention | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 14 19
Special Mention | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,584 2,262
Covered under loss share agreements 309  
Special Mention | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,027 2,739
Covered under loss share agreements 11,162 11,981
Special Mention | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 8,798 9,599
Covered under loss share agreements 175 927
Special Mention | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements   382
Special Mention | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 896 867
Covered under loss share agreements   562
Special Mention | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1 8
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 83,141 103,624
Covered under loss share agreements 92,948 101,228
Substandard | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 9,302 13,546
Covered under loss share agreements 9,357 17,834
Substandard | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,370 4,821
Covered under loss share agreements 350 197
Substandard | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 816 1,490
Covered under loss share agreements 620 649
Substandard | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 10,722 16,092
Covered under loss share agreements 4,837 3,015
Substandard | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 22,449 32,808
Covered under loss share agreements 20,547 19,189
Substandard | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 12 33
Covered under loss share agreements   1
Substandard | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,964 3,421
Covered under loss share agreements 97 156
Substandard | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,592 3,592
Covered under loss share agreements 49,443 53,116
Substandard | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 27,521 27,319
Covered under loss share agreements 5,795 5,786
Substandard | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Covered under loss share agreements 1,258 1,160
Substandard | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 381 501
Covered under loss share agreements 644 125
Substandard | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 12 1
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 5,763 5,827
Covered under loss share agreements 731 690
Doubtful | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 913 541
Covered under loss share agreements 128 178
Doubtful | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,630 3,838
Covered under loss share agreements 25 81
Doubtful | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 879 1,320
Covered under loss share agreements 14 125
Doubtful | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 119 120
Covered under loss share agreements 356 44
Doubtful | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 218  
Covered under loss share agreements 25 25
Doubtful | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Covered under loss share agreements 183 237
Doubtful | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4 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