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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | $ 35,487 | $ 55,180 |
Unpaid Principal Balance | 46,433 | 64,720 |
Related Allowance | 711 | 395 |
Average Recorded Investment | 36,490 | 47,071 | $ 50,728
Interest Income Recognized | 594 | 898 | 639
Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,141 | 3,720 |
Unpaid Principal Balance | 9,555 | 10,303 |
Average Recorded Investment | 3,751 | 9,240 | 6,371
Interest Income Recognized | 157 | 389 | 80
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and demand loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,141 | 3,720 |
Unpaid Principal Balance | 9,555 | 10,303 |
Average Recorded Investment | 3,751 | 9,240 | 6,371
Interest Income Recognized | 157 | 389 | 80
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Equipment Finance |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Commercial Financial Agricultural And Other With No Related Allowance [Member] | Time and Demand Loans Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 45 |
Unpaid Principal Balance | 0 | 53 |
Average Recorded Investment | 0 | 53 | 146
Interest Income Recognized | 0 | 0 | 14
Real Estate Construction With No Related Allowance [Member] | Construction Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Real Estate Construction With No Related Allowance [Member] | Construction Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 9,145 | 9,365 |
Unpaid Principal Balance | 11,010 | 11,294 |
Average Recorded Investment | 9,040 | 10,315 | 11,913
Interest Income Recognized | 241 | 375 | 335
Residential real estate with no related allowance recorded [Member] | Senior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 5,754 | 5,200 |
Unpaid Principal Balance | 6,848 | 6,337 |
Average Recorded Investment | 5,280 | 5,674 | 6,605
Interest Income Recognized | 172 | 279 | 241
Residential real estate with no related allowance recorded [Member] | Junior Lien |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 3,391 | 4,165 |
Unpaid Principal Balance | 4,162 | 4,957 |
Average Recorded Investment | 3,760 | 4,641 | 5,308
Interest Income Recognized | 69 | 96 | 94
Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 21,505 | 40,591 |
Unpaid Principal Balance | 24,119 | 41,525 |
Average Recorded Investment | 22,983 | 26,235 | 22,287
Interest Income Recognized | 172 | 119 | 184
Commercial Real Estate With No Related Allowance [Member] | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 14,677 |
Unpaid Principal Balance | 0 | 14,677 |
Average Recorded Investment | 172 | 1,223 | 1
Interest Income Recognized | 43 | 0 | 0
Commercial Real Estate With No Related Allowance [Member] | Nonowner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 20,155 | 24,581 |
Unpaid Principal Balance | 22,565 | 25,310 |
Average Recorded Investment | 21,304 | 22,668 | 18,536
Interest Income Recognized | 104 | 28 | 82
Commercial Real Estate With No Related Allowance [Member] | Owner Occupied Commercial Real Estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,350 | 1,333 |
Unpaid Principal Balance | 1,554 | 1,538 |
Average Recorded Investment | 1,507 | 2,344 | 3,750
Interest Income Recognized | 25 | 91 | 102
Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 528 | 446 |
Unpaid Principal Balance | 563 | 485 |
Average Recorded Investment | 455 | 479 | 470
Interest Income Recognized | 16 | 15 | 13
Loans To Individuals With No Related Allowance [Member] | Automobiles |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 440 | 388 |
Unpaid Principal Balance | 475 | 422 |
Average Recorded Investment | 378 | 425 | 447
Interest Income Recognized | 16 | 15 | 13
Loans To Individuals With No Related Allowance [Member] | Other consumer loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 88 | 58 |
Unpaid Principal Balance | 88 | 63 |
Average Recorded Investment | 77 | 54 | 23
Interest Income Recognized | 0 | 0 | 0
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 34,319 | 54,167 |
Unpaid Principal Balance | 45,247 | 63,660 |
Average Recorded Investment | 36,229 | 46,322 | 41,187
Interest Income Recognized | 586 | 898 | 626
Commercial, financial, agricultural and other With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,168 | 327 |
Unpaid Principal Balance | 1,186 | 349 |
Related Allowance | 711 | 307 |
Average Recorded Investment | 261 | 84 | 1,544
Interest Income Recognized | 8 | 0 | 3
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and demand loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 1,168 | 327 |
Unpaid Principal Balance | 1,186 | 349 |
Related Allowance | 711 | 307 |
Average Recorded Investment | 261 | 84 | 1,544
Interest Income Recognized | 8 | 0 | 3
Commercial, financial, agricultural and other With an allowance recorded [Member] | Equipment Finance |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Commercial, financial, agricultural and other With an allowance recorded [Member] | Time and Demand Loans Other |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 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 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Real estate construction with an allowance recorded [Member] | Construction Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 |  |
Unpaid Principal Balance | 0 |  |
Related Allowance | 0 |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
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 | 0
Interest Income Recognized | 0 | 0 | 0
Residential real estate With an allowance recorded [Member] | Senior Lien |  |  |
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
Residential real estate With an allowance recorded [Member] | Junior Lien |  |  |
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
Commercial real estate With an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 686 |
Unpaid Principal Balance | 0 | 711 |
Related Allowance | 0 | 88 |
Average Recorded Investment | 0 | 665 | 7,997
Interest Income Recognized | 0 | 0 | 10
Commercial real estate With an allowance recorded [Member] | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded Investment | 0 | 421 |
Unpaid Principal Balance | 0 | 446 |
Related Allowance | 0 | 88 |
Average Recorded Investment | 0 | 444 | 395
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 | 0 | 0 |
Unpaid Principal Balance | 0 | 0 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 0 | 7,363
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 | 0 | 265 |
Unpaid Principal Balance | 0 | 265 |
Related Allowance | 0 | 0 |
Average Recorded Investment | 0 | 221 | 239
Interest Income Recognized | 0 | 0 | 10
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 | 1,168 | 1,013 |
Unpaid Principal Balance | 1,186 | 1,060 |
Related Allowance | 711 | 395 |
Average Recorded Investment | 261 | 749 | 9,541
Interest Income Recognized | $ 8 | $ 0 | $ 13

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