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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 29,698 | $ 28,735 |
Unpaid Principal Balance | 39,122 | 38,787 |
Related Allowance | 2,432 | 1,500 |
Average Recorded Investment | 27,154 | 41,386 | $ 38,171
Interest Income Recognized | 684 | 1,098 | 1,451
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,848 | 8,735 |
Unpaid Principal Balance | 6,997 | 16,442 |
Average Recorded Investment | 2,411 | 18,480 | 10,282
Interest Income Recognized | 66 | 602 | 394
Originated Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Originated Loans [Member] | Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 10,372 | 10,726 |
Unpaid Principal Balance | 12,437 | 12,571 |
Average Recorded Investment | 10,819 | 10,651 | 11,366
Interest Income Recognized | 365 | 271 | 355
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,015 | 3,599 |
Unpaid Principal Balance | 3,210 | 3,812 |
Average Recorded Investment | 7,455 | 7,919 | 6,469
Interest Income Recognized | 156 | 177 | 583
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 406 | 281 |
Unpaid Principal Balance | 640 | 408 |
Average Recorded Investment | 371 | 310 | 353
Interest Income Recognized | 17 | 11 | 19
Originated Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 15,641 | 23,341 |
Unpaid Principal Balance | 23,284 | 33,233 |
Average Recorded Investment | 21,056 | 37,360 | 28,470
Interest Income Recognized | 604 | 1,061 | 1,351
Originated Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 8,290 | 3,042 |
Unpaid Principal Balance | 10,032 | 3,181 |
Related Allowance | 1,580 | 797 |
Average Recorded Investment | 4,110 | 2,531 | 9,391
Interest Income Recognized | 77 | 20 | 96
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 | 474 | 486 |
Unpaid Principal Balance | 498 | 495 |
Related Allowance | 1 | 107 |
Average Recorded Investment | 241 | 504 | 167
Interest Income Recognized | 0 | 13 | 0
Originated Loans [Member] | Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,293 | 1,866 |
Unpaid Principal Balance | 5,308 | 1,878 |
Related Allowance | 851 | 596 |
Average Recorded Investment | 1,747 | 991 | 143
Interest Income Recognized | 3 | 4 | 4
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 | 14,057 | 5,394 |
Unpaid Principal Balance | 15,838 | 5,554 |
Related Allowance | 2,432 | 1,500 |
Average Recorded Investment | 6,098 | 4,026 | 9,701
Interest Income Recognized | 80 | 37 | 100
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,519 | 3,292 |
Unpaid Principal Balance | 2,993 | 4,877 |
Related Allowance | 0 | 131 |
Average Recorded Investment | 5,225 | 3,712 | 3,406
Interest Income Recognized | 26 | 15 | 0
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 73 | 73 |
Unpaid Principal Balance | 73 | 73 |
Average Recorded Investment | 2,479 | 214 | 476
Interest Income Recognized | 0 | 10 | 0
Acquired Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 25
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 | 2,136 | 2,031 |
Unpaid Principal Balance | 2,585 | 2,604 |
Average Recorded Investment | 1,986 | 1,906 | 535
Interest Income Recognized | 8 | 5 | 0
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 298 | 1,042 |
Unpaid Principal Balance | 320 | 2,052 |
Average Recorded Investment | 747 | 1,565 | 2,135
Interest Income Recognized | 18 | 0 | 0
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 12 | 15 |
Unpaid Principal Balance | 15 | 17 |
Average Recorded Investment | 13 | 16 | 6
Interest Income Recognized | 0 | 0 | 0
Acquired Loans [Member] | Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,519 | 3,161 |
Unpaid Principal Balance | 2,993 | 4,746 |
Average Recorded Investment | 5,225 | 3,701 | 3,177
Interest Income Recognized | 26 | 15 | 0
Acquired Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 131 |
Unpaid Principal Balance | 0 | 131 |
Related Allowance | 0 | 131 |
Average Recorded Investment | 0 | 11 | 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 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 74
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 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 155
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 | 0 | 131 |
Unpaid Principal Balance | 0 | 131 |
Related Allowance | 0 | 131 |
Average Recorded Investment | 0 | 11 | 229
Interest Income Recognized | $ 0 | $ 0 | $ 0

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