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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 28,735 | $ 39,951 |
Unpaid Principal Balance | 38,787 | 53,021 |
Related Allowance | 1,500 | 3,713 |
Average Recorded Investment | 41,386 | 38,171 | $ 55,915
Interest Income Recognized | 1,098 | 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 | 8,735 | 5,548 |
Unpaid Principal Balance | 16,442 | 12,153 |
Average Recorded Investment | 18,480 | 10,282 | 23,146
Interest Income Recognized | 602 | 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 | 0 | 4
Interest Income Recognized | 0 | 0 | 44
Originated Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 10,726 | 10,625 |
Unpaid Principal Balance | 12,571 | 12,470 |
Average Recorded Investment | 10,651 | 11,366 | 10,957
Interest Income Recognized | 271 | 355 | 312
Originated Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,599 | 5,155 |
Unpaid Principal Balance | 3,812 | 5,489 |
Average Recorded Investment | 7,919 | 6,469 | 6,718
Interest Income Recognized | 177 | 583 | 170
Originated Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 281 | 347 |
Unpaid Principal Balance | 408 | 383 |
Average Recorded Investment | 310 | 353 | 409
Interest Income Recognized | 11 | 19 | 15
Originated Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 23,341 | 21,675 |
Unpaid Principal Balance | 33,233 | 30,495 |
Average Recorded Investment | 37,360 | 28,470 | 41,234
Interest Income Recognized | 1,061 | 1,351 | 1,117
Originated Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,042 | 16,866 |
Unpaid Principal Balance | 3,181 | 21,094 |
Related Allowance | 797 | 3,478 |
Average Recorded Investment | 2,531 | 9,391 | 13,885
Interest Income Recognized | 20 | 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 | 0
Interest Income Recognized | 0 | 0 | 0
Originated Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 486 | 456 |
Unpaid Principal Balance | 495 | 478 |
Related Allowance | 107 | 107 |
Average Recorded Investment | 504 | 167 | 241
Interest Income Recognized | 13 | 0 | 4
Originated Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,866 | 954 |
Unpaid Principal Balance | 1,878 | 954 |
Related Allowance | 596 | 128 |
Average Recorded Investment | 991 | 143 | 555
Interest Income Recognized | 4 | 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 | 0
Interest Income Recognized | 0 | 0 | 0
Originated Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,394 | 18,276 |
Unpaid Principal Balance | 5,554 | 22,526 |
Related Allowance | 1,500 | 3,713 |
Average Recorded Investment | 4,026 | 9,701 | 14,681
Interest Income Recognized | 37 | 100 | 128
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,292 | 2,289 |
Unpaid Principal Balance | 4,877 | 3,545 |
Related Allowance | 131 | 33 |
Average Recorded Investment | 3,712 | 3,406 | 587
Interest Income Recognized | 15 | 0 | 0
Acquired Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 73 | 436 |
Unpaid Principal Balance | 73 | 449 |
Average Recorded Investment | 214 | 476 | 0
Interest Income Recognized | 10 | 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 | 0 | 25 | 0
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,031 | 666 |
Unpaid Principal Balance | 2,604 | 965 |
Average Recorded Investment | 1,906 | 535 | 406
Interest Income Recognized | 5 | 0 | 0
Acquired Loans [Member] | Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,042 | 940 |
Unpaid Principal Balance | 2,052 | 1,842 |
Average Recorded Investment | 1,565 | 2,135 | 162
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 15 | 17 |
Unpaid Principal Balance | 17 | 17 |
Average Recorded Investment | 16 | 6 | 3
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,161 | 2,059 |
Unpaid Principal Balance | 4,746 | 3,273 |
Average Recorded Investment | 3,701 | 3,177 | 571
Interest Income Recognized | 15 | 0 | 0
Acquired Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 131 | 0 |
Unpaid Principal Balance | 131 | 0 |
Related Allowance | 131 | 0 |
Average Recorded Investment | 11 | 0 | 0
Interest Income Recognized | 0 | 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 | 0
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 93 |
Unpaid Principal Balance | 0 | 122 |
Related Allowance | 0 | 4 |
Average Recorded Investment | 0 | 74 | 16
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 137 |
Unpaid Principal Balance | 0 | 150 |
Related Allowance | 0 | 29 |
Average Recorded Investment | 0 | 155 | 0
Interest Income Recognized | 0 | 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 | 0
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 131 | 230 |
Unpaid Principal Balance | 131 | 272 |
Related Allowance | 131 | 33 |
Average Recorded Investment | 11 | 229 | 16
Interest Income Recognized | $ 0 | $ 0 | $ 0

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