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Business Combinations (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 08, 2012 | May 31, 2012 | Dec. 31, 2011
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Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income | $ 1,541,633 | $ 250,631 | $ 166,471 | $ 1,396,067
Construction, development, and other land [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 26,214 | 19,067 |
Commercial and industrial [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 10,844 | 20,001 |
Multi-family residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 3,388 | 5,263 |
Non-farm, non-residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 69,109 | 87,592 |
Agricultural [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 323 |  |
Farmland [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 2,567 |  |
Total commercial loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 112,445 | 131,923 |
Home equity lines [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 89,520 | 7,973 |
Single family owner occupied [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 38,205 | 23,845 |
Total consumer real estate loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 127,725 | 31,818 |
Consumer loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 10,461 | 2,730 |
Purchased Performing [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 135,247 | 133,868 |
Purchased Performing [Member] | Construction, development, and other land [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 19,690 | 9,641 |
Purchased Performing [Member] | Commercial and industrial [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 9,027 | 17,583 |
Purchased Performing [Member] | Multi-family residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 2,462 | 2,111 |
Purchased Performing [Member] | Non-farm, non-residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 45,737 | 75,399 |
Purchased Performing [Member] | Agricultural [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 321 |  |
Purchased Performing [Member] | Farmland [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 1,522 |  |
Purchased Performing [Member] | Total commercial loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 78,759 | 104,734 |
Purchased Performing [Member] | Home equity lines [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 21,439 | 7,637 |
Purchased Performing [Member] | Single family owner occupied [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 25,509 | 18,767 |
Purchased Performing [Member] | Total consumer real estate loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 46,948 | 26,404 |
Purchased Performing [Member] | Consumer loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 9,540 | 2,730 |
Purchased Impaired [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 115,384 | 32,603 |
Purchased Impaired [Member] | Construction, development, and other land [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 6,524 | 9,426 |
Purchased Impaired [Member] | Commercial and industrial [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 1,817 | 2,418 |
Purchased Impaired [Member] | Multi-family residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 926 | 3,152 |
Purchased Impaired [Member] | Non-farm, non-residential [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 23,372 | 12,193 |
Purchased Impaired [Member] | Agricultural [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 2 |  |
Purchased Impaired [Member] | Farmland [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 1,045 |  |
Purchased Impaired [Member] | Total commercial loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 33,686 | 27,189 |
Purchased Impaired [Member] | Home equity lines [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 68,081 | 336 |
Purchased Impaired [Member] | Single family owner occupied [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 12,696 | 5,078 |
Purchased Impaired [Member] | Total consumer real estate loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | 80,777 | 5,414 |
Purchased Impaired [Member] | Consumer loans [Member] |  |  |  |
Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] |  |  |  |
Loans held for investment, net of unearned income |  | $ 921 |  |

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- Definition Net carrying amount of all categories of loans and leases held in portfolio, net of unearned income and the allowance for losses on loans and leases. Includes receivables covered through loss sharing agreements. + References No definition available. + Details
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