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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 24,640 |  | $ 24,640 |  | $ 27,267
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 39,102 |  | 39,102 |  | 48,543
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 21,317 | $ 34,035 | 22,383 | $ 33,846 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (118) | 33 | (162) | 12 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 32,479 |  | 32,479 |  | 12,205
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 35,102 |  | 35,102 |  | 13,778
Related allowance | 10,911 |  | 10,911 |  | 4,549
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 24,617 | 12,882 | 19,027 | 9,186 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | (8) | 0 | (8) | 0 |
Recorded investment | 57,119 |  | 57,119 |  | 39,472
Unpaid principal balance | 74,204 |  | 74,204 |  | 62,321
Impaired Financing Receivable, Average Recorded Investment | 45,934 | 46,917 | 41,410 | 43,032 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | (126) | 33 | (170) | 12 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,634 |  | 3,634 |  | 4,369
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 16,474 |  | 16,474 |  | 18,014
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,764 | 4,416 | 5,153 | 4,444 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 10 | 0 | 10 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 10,133 |  | 10,133 |  | 5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 11,036 |  | 11,036 |  | 6,787
Related allowance | 6,199 |  | 6,199 |  | 4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 6,014 | 11,445 | 4,585 | 8,056 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | (8) | 0 | (8) | 0 |
Construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,869 |  | 5,869 |  | 3,288
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,869 |  | 5,869 |  | 3,288
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 | 8,327 |  | 8,327 |  | 7,042
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 9,974 |  | 9,974 |  | 8,763
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 8,169 | 6,312 | 7,943 | 6,190 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (105) | (19) | (113) | (40) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,249 |  | 1,249 |  | 1,531
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,418 |  | 1,418 |  | 1,697
Related allowance | 140 |  | 140 |  | 118
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,249 | 1,237 | 1,249 | 1,030 |
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 | 6,682 |  | 6,682 |  | 12,402
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 6,565 |  | 6,565 |  | 18,219
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,102 | 22,853 | 5,426 | 22,769 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (11) | 43 | (46) | 43 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 21,097 |  | 21,097 |  | 4,983
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 22,648 |  | 22,648 |  | 5,294
Related allowance | 4,572 |  | 4,572 |  | 387
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 17,354 | 200 | 13,193 | 100 |
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 | 128 |  | 128 |  | 166
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 220 |  | 220 |  | 259
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 134 | 454 | 143 | 443 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (2) | (1) | (3) | (1) |
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 | 4,148 | 0 | 3,718 | 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 | 2,907 |  | 2,907 |  | 3,527
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 15,747 |  | 15,747 |  | 17,172
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,959 | 4,332 | 4,366 | 4,283 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 10 | 0 | 10 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 9,873 |  | 9,873 |  | 5,691
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 10,776 |  | 10,776 |  | 6,787
Related allowance | 6,114 |  | 6,114 |  | 4,044
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 5,927 | 11,445 | 4,542 | 8,056 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | (8) | 0 | (8) | 0 |
Senior Lien | Residential real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,043 |  | 5,043 |  | 4,161
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,952 |  | 5,952 |  | 5,151
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,855 | 3,584 | 4,708 | 3,510 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (102) | (19) | (110) | (40) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 282
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 279
Related allowance | 0 |  | 0 |  | 39
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 | 3,284 |  | 3,284 |  | 2,881
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,022 |  | 4,022 |  | 3,612
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,314 | 2,728 | 3,235 | 2,680 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (3) | 0 | (3) | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,249 |  | 1,249 |  | 1,249
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,418 |  | 1,418 |  | 1,418
Related allowance | 140 |  | 140 |  | 79
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,249 | 1,237 | 1,249 | 1,030 |
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 | 47 |  | 47 |  | 55
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 52 |  | 52 |  | 58
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 48 | 23 | 50 | 11 |
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 | 3,923 |  | 3,923 |  | 10,971
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,687 |  | 3,687 |  | 17,092
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,890 | 20,527 | 2,513 | 20,565 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (1) | (4) | (3) | (4) |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 19,303 |  | 19,303 |  | 3,311
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 20,729 |  | 20,729 |  | 3,550
Related allowance | 3,624 |  | 3,624 |  | 174
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 15,785 | 0 | 12,223 | 0 |
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 | 2,712 |  | 2,712 |  | 1,376
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,826 |  | 2,826 |  | 1,069
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,164 | 2,303 | 2,863 | 2,193 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (10) | 47 | (43) | 47 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,794 |  | 1,794 |  | 1,672
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,919 |  | 1,919 |  | 1,744
Related allowance | 948 |  | 948 |  | 213
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,569 | 200 | 970 | 100 |
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 | 126 |  | 126 |  | 164
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 218 |  | 218 |  | 257
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 132 | 353 | 141 | 355 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | (2) | (1) | (3) | (1) |
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 |  | 2
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2 |  | 2 |  | 2
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2 | 101 | 2 | 88 |
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 | 5,869 |  | 5,869 |  | 3,288
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,869 |  | 5,869 |  | 3,288
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 | 4,148 | 0 | 3,718 | 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 | 727 |  | 727 |  | 842
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 727 |  | 727 |  | 842
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 805 | 84 | 787 | 161 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 260 |  | 260 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 260 |  | 260 |  | 0
Related allowance | 85 |  | 85 |  | $ 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 87 | 0 | 43 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |

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