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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | $ 50,844 |
Unpaid Principal Balance |  | 61,835 |
Related Allowance |  | 7,045 |
Average Recorded Investment |  | 45,458 | $ 49,794
Interest Income Recognized |  | 615 | 625
Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 11,344 |
Unpaid Principal Balance |  | 15,673 |
Average Recorded Investment |  | 17,692 | 11,536
Interest Income Recognized |  | 216 | 133
Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 28 |
Unpaid Principal Balance |  | 117 |
Average Recorded Investment |  | 95 | 1,190
Interest Income Recognized |  | 0 | 19
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 9,952 |
Unpaid Principal Balance |  | 11,819 |
Average Recorded Investment |  | 10,635 | 11,592
Interest Income Recognized |  | 172 | 210
Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 7,562 |
Unpaid Principal Balance |  | 9,449 |
Average Recorded Investment |  | 7,890 | 8,830
Interest Income Recognized |  | 90 | 98
Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 421 |
Unpaid Principal Balance |  | 507 |
Average Recorded Investment |  | 338 | 308
Interest Income Recognized |  | 4 | 4
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 29,307 |
Unpaid Principal Balance |  | 37,565 |
Average Recorded Investment |  | 36,650 | 33,456
Interest Income Recognized |  | 482 | 464
Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 20,132 |
Unpaid Principal Balance |  | 22,590 |
Related Allowance |  | 6,952 |
Average Recorded Investment |  | 7,731 | 15,797
Interest Income Recognized |  | 129 | 143
Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 0 |
Unpaid Principal Balance |  | 0 |
Related Allowance |  | 0 |
Average Recorded Investment |  | 0 | 0
Interest Income Recognized |  | 0 | 0
Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 461 |
Unpaid Principal Balance |  | 672 |
Related Allowance |  | 51 |
Average Recorded Investment |  | 403 | 357
Interest Income Recognized |  | 0 | 14
Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 944 |
Unpaid Principal Balance |  | 1,008 |
Related Allowance |  | 42 |
Average Recorded Investment |  | 674 | 184
Interest Income Recognized |  | 4 | 4
Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 0 |
Unpaid Principal Balance |  | 0 |
Related Allowance |  | 0 |
Average Recorded Investment |  | 0 | 0
Interest Income Recognized |  | 0 | 0
Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment |  | 21,537 |
Unpaid Principal Balance |  | 24,270 |
Related Allowance |  | 7,045 |
Average Recorded Investment |  | 8,808 | 16,338
Interest Income Recognized |  | $ 133 | $ 161
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 41,226 |  |
Unpaid Principal Balance | 56,296 |  |
Related Allowance | 3,128 |  |
Average Recorded Investment | 55,915 |  |
Interest Income Recognized | 1,245 |  |
Originated Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 9,549 |  |
Unpaid Principal Balance | 15,369 |  |
Average Recorded Investment | 23,146 |  |
Interest Income Recognized | 576 |  |
Originated Loans [Member] | Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 4 |  |
Interest Income Recognized | 44 |  |
Originated Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 10,873 |  |
Unpaid Principal Balance | 13,004 |  |
Average Recorded Investment | 10,957 |  |
Interest Income Recognized | 312 |  |
Originated Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,765 |  |
Unpaid Principal Balance | 6,905 |  |
Average Recorded Investment | 6,718 |  |
Interest Income Recognized | 170 |  |
Originated Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 382 |  |
Unpaid Principal Balance | 507 |  |
Average Recorded Investment | 409 |  |
Interest Income Recognized | 15 |  |
Originated Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 26,569 |  |
Unpaid Principal Balance | 35,785 |  |
Average Recorded Investment | 41,234 |  |
Interest Income Recognized | 1,117 |  |
Originated Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 13,423 |  |
Unpaid Principal Balance | 19,226 |  |
Related Allowance | 2,530 |  |
Average Recorded Investment | 13,885 |  |
Interest Income Recognized | 99 |  |
Originated Loans [Member] | Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Originated Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 424 |  |
Unpaid Principal Balance | 475 |  |
Related Allowance | 164 |  |
Average Recorded Investment | 241 |  |
Interest Income Recognized | 4 |  |
Originated Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 810 |  |
Unpaid Principal Balance | 810 |  |
Related Allowance | 434 |  |
Average Recorded Investment | 555 |  |
Interest Income Recognized | 25 |  |
Originated Loans [Member] | Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Originated Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 14,657 |  |
Unpaid Principal Balance | 20,511 |  |
Related Allowance | 3,128 |  |
Average Recorded Investment | 14,681 |  |
Interest Income Recognized | 128 |  |
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 587 |  |
Unpaid Principal Balance | 661 |  |
Related Allowance | 16 |  |
Average Recorded Investment | 587 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 406 |  |
Unpaid Principal Balance | 480 |  |
Average Recorded Investment | 406 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 162 |  |
Unpaid Principal Balance | 162 |  |
Average Recorded Investment | 162 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3 |  |
Unpaid Principal Balance | 3 |  |
Average Recorded Investment | 3 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 571 |  |
Unpaid Principal Balance | 645 |  |
Average Recorded Investment | 571 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Real estate construction with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 16 |  |
Unpaid Principal Balance | 16 |  |
Related Allowance | 16 |  |
Average Recorded Investment | 16 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Loans to individuals With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Acquired Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 16 |  |
Unpaid Principal Balance | 16 |  |
Related Allowance | 16 |  |
Average Recorded Investment | 16 |  |
Interest Income Recognized | $ 0 |  |

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