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Company's Investment in Loans Held for Investment by Internal Credit Grade Indicator (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements $ 1,494,232 $ 1,517,547
Covered under loss share agreements 195,060 207,106
Commercial Loans
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 823,422 832,867
Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 55,220 57,434
Covered under loss share agreements 24,495 26,595
Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 91,666 88,738
Covered under loss share agreements 5,205 6,948
Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 63,929 65,694
Covered under loss share agreements 2,549 2,611
Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 136,334 135,912
Covered under loss share agreements 10,672 11,428
Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 440,226 448,810
Covered under loss share agreements 42,857 48,565
Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,117 1,709
Covered under loss share agreements 128 144
Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 33,930 34,570
Covered under loss share agreements 1,222 1,091
Consumer Real Estate
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 598,582 600,851
Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 108,385 111,081
Covered under loss share agreements 80,463 81,445
Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 470,437 473,547
Covered under loss share agreements 23,042 22,961
Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 19,760 16,223
Covered under loss share agreements 1,628 1,644
Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 68,625 78,163
Covered under loss share agreements 2,799 3,674
Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,603 5,666
Pass
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,354,079 1,362,219
Covered under loss share agreements 81,533 81,453
Pass | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 38,976 41,850
Covered under loss share agreements 12,747 6,463
Pass | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 80,683 77,573
Covered under loss share agreements 4,320 6,225
Pass | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 58,241 60,161
Covered under loss share agreements 1,928 1,962
Pass | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 119,349 112,562
Covered under loss share agreements 5,050 6,065
Pass | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 401,887 399,907
Covered under loss share agreements 19,973 23,855
Pass | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,071 1,657
Covered under loss share agreements 127 143
Pass | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 28,411 28,887
Covered under loss share agreements 1,125 935
Pass | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 101,881 104,750
Covered under loss share agreements 16,989 16,323
Pass | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 433,486 436,587
Covered under loss share agreements 16,668 16,011
Pass | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 19,343 15,841
Covered under loss share agreements 473 484
Pass | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 66,166 76,787
Covered under loss share agreements 2,133 2,987
Pass | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,585 5,657
Special Mention
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 38,917 45,835
Covered under loss share agreements 15,043 23,735
Special Mention | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,279 1,497
Covered under loss share agreements 963 2,120
Special Mention | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,576 2,506
Covered under loss share agreements 179 445
Special Mention | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,141 4,043
Special Mention | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,835 5,938
Covered under loss share agreements   2,223
Special Mention | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 10,983 15,975
Covered under loss share agreements 1,939 5,477
Special Mention | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 17 19
Special Mention | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,413 2,262
Special Mention | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 2,992 2,739
Covered under loss share agreements 11,762 11,981
Special Mention | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 9,270 9,599
Covered under loss share agreements 200 927
Special Mention | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 417 382
Special Mention | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,989 867
Covered under loss share agreements   562
Special Mention | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 5 8
Substandard
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 95,025 103,624
Covered under loss share agreements 98,015 101,228
Substandard | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 13,968 13,546
Covered under loss share agreements 10,751 17,834
Substandard | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 5,792 4,821
Covered under loss share agreements 658 197
Substandard | Commercial Loans | Multi-family Residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 1,547 1,490
Covered under loss share agreements 621 649
Substandard | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 11,180 16,092
Covered under loss share agreements 5,536 3,015
Substandard | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 27,196 32,808
Covered under loss share agreements 20,900 19,189
Substandard | Commercial Loans | Agricultural
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 29 33
Covered under loss share agreements 1 1
Substandard | Commercial Loans | Farmland Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 4,106 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 3,476 3,592
Covered under loss share agreements 51,687 53,116
Substandard | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 27,252 27,319
Covered under loss share agreements 5,943 5,786
Substandard | Consumer Real Estate | Owner occupied construction
   
Financing Receivable, Recorded Investment [Line Items]    
Covered under loss share agreements 1,155 1,160
Substandard | Consumer and Other | Consumer Loan
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 466 501
Covered under loss share agreements 666 125
Substandard | Consumer and Other | Other
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 13 1
Doubtful
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 6,211 5,827
Covered under loss share agreements 469 690
Doubtful | Commercial Loans | Construction Development And Other Land
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 997 541
Covered under loss share agreements 34 178
Doubtful | Commercial Loans | Commercial and Industrial
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 3,615 3,838
Covered under loss share agreements 48 81
Doubtful | Commercial Loans | Single-family Non-owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 970 1,320
Covered under loss share agreements 86 125
Doubtful | Commercial Loans | Non-farm, Non-residential
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 160 120
Covered under loss share agreements 45 44
Doubtful | Consumer Real Estate | Home Equity Lines
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 36  
Covered under loss share agreements 25 25
Doubtful | Consumer Real Estate | Single Family Owner Occupied
   
Financing Receivable, Recorded Investment [Line Items]    
Not covered under loss share agreements 429  
Covered under loss share agreements 231 237
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