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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 | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 17,789 |  | $ 17,789 |  | $ 34,319
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 28,958 |  | 28,958 |  | 45,247
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 18,204 | $ 29,066 | 20,244 | $ 29,844 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (389) | (110) | (393) | (380) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 30,135 |  | 30,135 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 32,427 |  | 32,427 |  | 1,186
Related allowance | 16,226 |  | 16,226 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 29,730 | 6,920 | 24,423 | 6,990 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 16 | 0 |
Recorded investment | 47,924 |  | 47,924 |  | 35,487
Unpaid principal balance | 61,385 |  | 61,385 |  | 46,433
Impaired Financing Receivable, Average Recorded Investment | 47,934 | 35,986 | 44,667 | 36,834 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | (389) | (110) | (377) | (380) |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,671 |  | 2,671 |  | 3,141
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 11,142 |  | 11,142 |  | 9,555
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,509 | 3,518 | 3,974 | 3,762 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (135) | (30) | (141) | (88) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,229 |  | 15,229 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 16,562 |  | 16,562 |  | 1,186
Related allowance | 11,994 |  | 11,994 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 14,980 | 584 | 10,190 | 195 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 16 | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,288 |  | 3,288 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,288 |  | 3,288 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 6,514 |  | 6,514 |  | 9,145
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 8,328 |  | 8,328 |  | 11,010
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6,290 | 8,981 | 6,224 | 8,984 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (35) | (48) | (75) | (190) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,236 |  | 1,236 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,406 |  | 1,406 |  | 0
Related allowance | 70 |  | 70 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,236 | 0 | 1,099 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,114 |  | 5,114 |  | 21,505
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,847 |  | 5,847 |  | 24,119
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 7,908 | 16,124 | 9,253 | 16,663 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (213) | (27) | (170) | (89) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 13,670 |  | 13,670 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 14,459 |  | 14,459 |  | 0
Related allowance | 4,162 |  | 4,162 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 13,514 | 6,336 | 13,134 | 6,795 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 202 |  | 202 |  | 528
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 353 |  | 353 |  | 563
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 401 | 443 | 428 | 435 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (6) | (5) | (7) | (13) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,096 | 0 | 365 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Time and Demand Loans | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,290 |  | 2,290 |  | 3,141
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 10,761 |  | 10,761 |  | 9,555
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,269 | 3,518 | 3,786 | 3,762 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (135) | (30) | (141) | (88) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 15,229 |  | 15,229 |  | 1,168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 16,562 |  | 16,562 |  | 1,186
Related allowance | 11,994 |  | 11,994 |  | 711
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 14,980 | 584 | 10,190 | 195 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 16 | 0 |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,883 |  | 3,883 |  | 5,754
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,970 |  | 4,970 |  | 6,848
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,784 | 5,200 | 3,602 | 5,120 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (34) | (33) | (74) | (139) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Junior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,631 |  | 2,631 |  | 3,391
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,358 |  | 3,358 |  | 4,162
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,506 | 3,781 | 2,622 | 3,864 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (1) | (15) | (1) | (51) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,236 |  | 1,236 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,406 |  | 1,406 |  | 0
Related allowance | 70 |  | 70 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,236 | 0 | 1,099 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Multifamily | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 68 |  | 68 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 68 |  | 68 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 68 | 0 | 30 | 230 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Nonowner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,575 |  | 3,575 |  | 20,155
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,553 |  | 4,553 |  | 22,565
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6,498 | 14,637 | 7,313 | 14,869 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (53) | (18) | (57) | (69) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 12,601 |  | 12,601 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 13,369 |  | 13,369 |  | 0
Related allowance | 4,099 |  | 4,099 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 12,601 | 6,336 | 12,763 | 6,795 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Owner Occupied Commercial Real Estate | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,471 |  | 1,471 |  | 1,350
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,226 |  | 1,226 |  | 1,554
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,342 | 1,487 | 1,910 | 1,564 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (160) | (9) | (113) | (20) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,069 |  | 1,069 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,090 |  | 1,090 |  | 0
Related allowance | 63 |  | 63 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 913 | 0 | 371 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Automobiles | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 200 |  | 200 |  | 440
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 351 |  | 351 |  | 475
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 315 | 369 | 341 | 363 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (6) | (5) | (7) | (13) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Other Consumer Loans | Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2 |  | 2 |  | 88
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2 |  | 2 |  | 88
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 86 | 74 | 87 | 72 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Construction Residential | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Construction Residential | Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Construction Other | Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,288 |  | 3,288 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,288 |  | 3,288 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Construction Other | Real estate construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,096 | 0 | 365 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Time and Demand Loans Other | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Equipment Finance | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 381 |  | 381 |  | 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 381 |  | 381 |  | 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 240 | 0 | 188 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 0
Related allowance | 0 |  | 0 |  | $ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |

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