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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 39,472 | $ 35,487 |
Unpaid Principal Balance | 62,321 | 46,433 |
Related Allowance | 4,549 | 711 |
Average Recorded Investment | 44,923 | 36,490 | $ 47,071
Interest Income Recognized | 530 | 594 | 898
Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 4,369 | 3,141 |
Unpaid Principal Balance | 18,014 | 9,555 |
Average Recorded Investment | 7,895 | 3,751 | 9,240
Interest Income Recognized | 143 | 157 | 389
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and demand loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,527 | 3,141 |
Unpaid Principal Balance | 17,172 | 9,555 |
Average Recorded Investment | 7,569 | 3,751 | 9,240
Interest Income Recognized | 143 | 157 | 389
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Equipment Finance |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 842 | 0 |
Unpaid Principal Balance | 842 | 0 |
Average Recorded Investment | 326 | 0 |
Interest Income Recognized | 0 | 0 |
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and Demand Loans Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,288 | 0 |
Unpaid Principal Balance | 3,288 | 0 |
Average Recorded Investment | 1,096 | 0 | 53
Interest Income Recognized | 0 | 0 | 0
Real Estate Construction With No Related Allowance [Member] | Construction Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,288 | 0 |
Unpaid Principal Balance | 3,288 | 0 |
Average Recorded Investment | 1,096 | 0 |
Interest Income Recognized | 0 | 0 |
Real Estate Construction With No Related Allowance [Member] | Construction Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Average Recorded Investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 7,042 | 9,145 |
Unpaid Principal Balance | 8,763 | 11,010 |
Average Recorded Investment | 6,440 | 9,040 | 10,315
Interest Income Recognized | 136 | 241 | 375
Residential real estate with no related allowance recorded [Member] | Senior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 4,161 | 5,754 |
Unpaid Principal Balance | 5,151 | 6,848 |
Average Recorded Investment | 3,760 | 5,280 | 5,674
Interest Income Recognized | 129 | 172 | 279
Residential real estate with no related allowance recorded [Member] | Junior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2,881 | 3,391 |
Unpaid Principal Balance | 3,612 | 4,162 |
Average Recorded Investment | 2,680 | 3,760 | 4,641
Interest Income Recognized | 7 | 69 | 96
Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 12,402 | 21,505 |
Unpaid Principal Balance | 18,219 | 24,119 |
Average Recorded Investment | 20,715 | 22,983 | 26,235
Interest Income Recognized | 260 | 172 | 119
Commercial Real Estate With No Related Allowance [Member] | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 55 | 0 |
Unpaid Principal Balance | 58 | 0 |
Average Recorded Investment | 37 | 172 | 1,223
Interest Income Recognized | 0 | 43 | 0
Commercial Real Estate With No Related Allowance [Member] | Nonowner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 10,971 | 20,155 |
Unpaid Principal Balance | 17,092 | 22,565 |
Average Recorded Investment | 18,454 | 21,304 | 22,668
Interest Income Recognized | 122 | 104 | 28
Commercial Real Estate With No Related Allowance [Member] | Owner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,376 | 1,350 |
Unpaid Principal Balance | 1,069 | 1,554 |
Average Recorded Investment | 2,224 | 1,507 | 2,344
Interest Income Recognized | 138 | 25 | 91
Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 166 | 528 |
Unpaid Principal Balance | 259 | 563 |
Average Recorded Investment | 365 | 455 | 479
Interest Income Recognized | 7 | 16 | 15
Loans To Individuals With No Related Allowance [Member] | Automobiles |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 164 | 440 |
Unpaid Principal Balance | 257 | 475 |
Average Recorded Investment | 299 | 378 | 425
Interest Income Recognized | 7 | 16 | 15
Loans To Individuals With No Related Allowance [Member] | Other consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 2 | 88 |
Unpaid Principal Balance | 2 | 88 |
Average Recorded Investment | 66 | 77 | 54
Interest Income Recognized | 0 | 0 | 0
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 27,267 | 34,319 |
Unpaid Principal Balance | 48,543 | 45,247 |
Average Recorded Investment | 36,511 | 36,229 | 46,322
Interest Income Recognized | 546 | 586 | 898
Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,691 | 1,168 |
Unpaid Principal Balance | 6,787 | 1,186 |
Related Allowance | 4,044 | 711 |
Average Recorded Investment | 6,574 | 261 | 84
Interest Income Recognized | (16) | 8 | 0
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and demand loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,691 | 1,168 |
Unpaid Principal Balance | 6,787 | 1,186 |
Related Allowance | 4,044 | 711 |
Average Recorded Investment | 6,574 | 261 | 84
Interest Income Recognized | (16) | 8 | 0
Commercial, financial, agricultural and other With an allowance recorded [Member] | Equipment Finance |  |  |
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 |
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and Demand Loans Other |  |  |
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 |
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
Real estate construction with an allowance recorded [Member] | Construction Other |  |  |
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 |
Real estate construction with an allowance recorded [Member] | Construction Residential |  |  |
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 |
Residential real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,531 | 0 |
Unpaid Principal Balance | 1,697 | 0 |
Related Allowance | 118 | 0 |
Average Recorded Investment | 1,183 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Residential real estate With an allowance recorded [Member] | Senior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 282 | 0 |
Unpaid Principal Balance | 279 | 0 |
Related Allowance | 39 | 0 |
Average Recorded Investment | 47 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Residential real estate With an allowance recorded [Member] | Junior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,249 | 0 |
Unpaid Principal Balance | 1,418 | 0 |
Related Allowance | 79 | 0 |
Average Recorded Investment | 1,136 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 4,983 | 0 |
Unpaid Principal Balance | 5,294 | 0 |
Related Allowance | 387 | 0 |
Average Recorded Investment | 655 | 0 | 665
Interest Income Recognized | 0 | 0 | 0
Commercial real estate With an allowance recorded [Member] | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 444
Interest Income Recognized | 0 | 0 | 0
Commercial real estate With an allowance recorded [Member] | Nonowner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,311 | 0 |
Unpaid Principal Balance | 3,550 | 0 |
Related Allowance | 174 | 0 |
Average Recorded Investment | 397 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Commercial real estate With an allowance recorded [Member] | Owner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,672 | 0 |
Unpaid Principal Balance | 1,744 | 0 |
Related Allowance | 213 | 0 |
Average Recorded Investment | 258 | 0 | 221
Interest Income Recognized | 0 | 0 | 0
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
Loans to individuals With an allowance recorded [Member] | Automobiles |  |  |
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
Loans to individuals With an allowance recorded [Member] | Other consumer loans |  |  |
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
Subtotal With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 12,205 | 1,168 |
Unpaid Principal Balance | 13,778 | 1,186 |
Related Allowance | 4,549 | 711 |
Average Recorded Investment | 8,412 | 261 | 749
Interest Income Recognized | $ (16) | $ 8 | $ 0

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