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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 | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | $ 45,458
Interest Income Recognized |  |  | 615
Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 17,692
Interest Income Recognized |  |  | 216
Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 95
Interest Income Recognized |  |  | 0
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 10,635
Interest Income Recognized |  |  | 172
Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 7,890
Interest Income Recognized |  |  | 90
Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 338
Interest Income Recognized |  |  | 4
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 36,650
Interest Income Recognized |  |  | 482
Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 7,731
Interest Income Recognized |  |  | 129
Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 0
Interest Income Recognized |  |  | 0
Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 403
Interest Income Recognized |  |  | 0
Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 674
Interest Income Recognized |  |  | 4
Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 0
Interest Income Recognized |  |  | 0
Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 8,808
Interest Income Recognized |  |  | $ 133
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 39,951 | $ 41,226 |
Unpaid Principal Balance | 53,021 | 56,296 |
Related Allowance | 3,713 | 3,128 |
Average Recorded Investment | 38,171 | 55,915 |
Interest Income Recognized | 1,451 | 1,245 |
Originated Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,548 | 9,549 |
Unpaid Principal Balance | 12,153 | 15,369 |
Average Recorded Investment | 10,282 | 23,146 |
Interest Income Recognized | 394 | 576 |
Originated Loans [Member] | Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 0 | 4 |
Interest Income Recognized | 0 | 44 |
Originated Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 10,625 | 10,873 |
Unpaid Principal Balance | 12,470 | 13,004 |
Average Recorded Investment | 11,366 | 10,957 |
Interest Income Recognized | 355 | 312 |
Originated Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,155 | 5,765 |
Unpaid Principal Balance | 5,489 | 6,905 |
Average Recorded Investment | 6,469 | 6,718 |
Interest Income Recognized | 583 | 170 |
Originated Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 347 | 382 |
Unpaid Principal Balance | 383 | 507 |
Average Recorded Investment | 353 | 409 |
Interest Income Recognized | 19 | 15 |
Originated Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 21,675 | 26,569 |
Unpaid Principal Balance | 30,495 | 35,785 |
Average Recorded Investment | 28,470 | 41,234 |
Interest Income Recognized | 1,351 | 1,117 |
Originated Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 16,866 | 13,423 |
Unpaid Principal Balance | 21,094 | 19,226 |
Related Allowance | 3,478 | 2,530 |
Average Recorded Investment | 9,391 | 13,885 |
Interest Income Recognized | 96 | 99 |
Originated Loans [Member] | Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Originated Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 456 | 424 |
Unpaid Principal Balance | 478 | 475 |
Related Allowance | 107 | 164 |
Average Recorded Investment | 167 | 241 |
Interest Income Recognized | 0 | 4 |
Originated Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 954 | 810 |
Unpaid Principal Balance | 954 | 810 |
Related Allowance | 128 | 434 |
Average Recorded Investment | 143 | 555 |
Interest Income Recognized | 4 | 25 |
Originated Loans [Member] | Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Originated Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 18,276 | 14,657 |
Unpaid Principal Balance | 22,526 | 20,511 |
Related Allowance | 3,713 | 3,128 |
Average Recorded Investment | 9,701 | 14,681 |
Interest Income Recognized | 100 | 128 |
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,289 | 587 |
Unpaid Principal Balance | 3,545 | 661 |
Related Allowance | 33 | 16 |
Average Recorded Investment | 3,406 | 587 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 436 | 0 |
Unpaid Principal Balance | 449 | 0 |
Average Recorded Investment | 476 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 25 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 666 | 406 |
Unpaid Principal Balance | 965 | 480 |
Average Recorded Investment | 535 | 406 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 940 | 162 |
Unpaid Principal Balance | 1,842 | 162 |
Average Recorded Investment | 2,135 | 162 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 17 | 3 |
Unpaid Principal Balance | 17 | 3 |
Average Recorded Investment | 6 | 3 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,059 | 571 |
Unpaid Principal Balance | 3,273 | 645 |
Average Recorded Investment | 3,177 | 571 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 93 | 16 |
Unpaid Principal Balance | 122 | 16 |
Related Allowance | 4 | 16 |
Average Recorded Investment | 74 | 16 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 137 | 0 |
Unpaid Principal Balance | 150 | 0 |
Related Allowance | 29 | 0 |
Average Recorded Investment | 155 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Acquired Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 230 | 16 |
Unpaid Principal Balance | 272 | 16 |
Related Allowance | 33 | 16 |
Average Recorded Investment | 229 | 16 |
Interest Income Recognized | $ 0 | $ 0 |

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