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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | $ 93,906 |  | $ 93,906 |  | $ 98,752
Unpaid principal balance | 124,209 |  | 124,209 |  | 130,627
Related allowance | 12,914 |  | 12,914 |  | 13,236
Average Recorded Investment | 87,099 | 151,403 | 84,055 | 140,649 |
Interest Income Recognized | 133 | 409 | 219 | 690 |
Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 6,762 |  | 6,762 |  | 2,010
Unpaid principal balance | 7,716 |  | 7,716 |  | 3,418
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 6,664 | 1,989 | 9,281 | 3,695 |
Interest Income Recognized | 94 | 6 | 116 | 11 |
Real estate construction with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 4,087 |  | 4,087 |  | 10,814
Unpaid principal balance | 7,424 |  | 7,424 |  | 20,161
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 4,954 | 16,465 | 6,641 | 21,611 |
Interest Income Recognized | 0 | (1) | 0 | 1 |
Residential real estate with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 7,087 |  | 7,087 |  | 3,125
Unpaid principal balance | 7,556 |  | 7,556 |  | 3,513
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 4,374 | 3,131 | 7,604 | 2,519 |
Interest Income Recognized | 6 | 3 | 17 | 4 |
Commercial real estate with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 29,394 |  | 29,394 |  | 36,777
Unpaid principal balance | 31,055 |  | 31,055 |  | 41,974
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 29,878 | 19,676 | 27,869 | 27,322 |
Interest Income Recognized | 14 | 228 | 50 | 246 |
Loans to individuals with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 84 |  | 84 |  | 0
Unpaid principal balance | 84 |  | 84 |  | 0
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 28 | 7 | 9 | 13 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Subtotal with no related allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 47,414 |  | 47,414 |  | 52,726
Unpaid principal balance | 53,835 |  | 53,835 |  | 69,066
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 45,898 | 41,268 | 51,404 | 55,160 |
Interest Income Recognized | 114 | 236 | 183 | 262 |
Commercial, financial, agricultural and other with an allowance recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 26,719 |  | 26,719 |  | 34,056
Unpaid principal balance | 27,558 |  | 27,558 |  | 34,341
Related allowance | 7,306 |  | 7,306 |  | 9,069
Average Recorded Investment | 25,469 | 37,552 | 21,025 | 29,614 |
Interest Income Recognized | 2 | 50 | 5 | 126 |
Real estate construction with related allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 7,482 |  | 7,482 |  | 6,298
Unpaid principal balance | 30,312 |  | 30,312 |  | 21,402
Related allowance | 973 |  | 973 |  | 2,960
Average Recorded Investment | 8,848 | 20,237 | 7,381 | 19,858 |
Interest Income Recognized | 0 | (2) | 0 | 0 |
Residential Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 2,752 |  | 2,752 |  | 955
Unpaid principal balance | 2,752 |  | 2,752 |  | 955
Related allowance | 719 |  | 719 |  | 93
Average Recorded Investment | 2,130 | 669 | 1,532 | 422 |
Interest Income Recognized | 6 | 1 | 20 | 1 |
Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 9,539 |  | 9,539 |  | 4,717
Unpaid principal balance | 9,752 |  | 9,752 |  | 4,863
Related allowance | 3,916 |  | 3,916 |  | 1,114
Average Recorded Investment | 4,754 | 51,677 | 2,713 | 35,595 |
Interest Income Recognized | 11 | 124 | 11 | 301 |
Loans To Individuals With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Subtotal With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment | 46,492 |  | 46,492 |  | 46,026
Unpaid principal balance | 70,374 |  | 70,374 |  | 61,561
Related allowance | 12,914 |  | 12,914 |  | 13,236
Average Recorded Investment | 41,201 | 110,135 | 32,651 | 85,489 |
Interest Income Recognized | $ 19 | $ 173 | $ 36 | $ 428 |

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