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Loans and ACL - Summary of Amortized Cost of Loans Held for Investment by Internal Loan Grade by Year of Orgination (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | $ 195,941 |  | $ 195,941 |
2022 | 855,752 |  | 855,752 |
2021 | 371,721 |  | 371,721 |
2020 | 289,705 |  | 289,705 |
2019 | 106,873 |  | 106,873 |
Prior | 357,649 |  | 357,649 |
Revolving Loans | 268,244 |  | 268,244 |
Total | 2,445,885 |  | 2,445,885 |
Current period gross charge-offs | 2,581 | $ 748 | 12,910 | $ 6,315
Current period gross charge-offs 2023 |  |  | 2,417 |
Current period gross charge-offs 2022 |  |  | 8,238 |
Current period gross charge-offs 2021 |  |  | 448 |
Current period gross charge-offs 2020 |  |  | 761 |
Current period gross charge-offs 2019 |  |  | 773 |
Current period gross charge-offs prior |  |  | 142 |
Current period gross charge-offs revolving |  |  | 131 |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 59,164 |  | 59,164 |
2022 | 194,146 |  | 194,146 |
2021 | 53,453 |  | 53,453 |
2020 | 36,935 |  | 36,935 |
2019 | 13,040 |  | 13,040 |
Prior | 18,578 |  | 18,578 |
Revolving Loans | 157,683 |  | 157,683 |
Total | 532,999 |  | 532,999 |
Current period gross charge-offs | 1,832 | 31 | 9,927 | 4,958
Current period gross charge-offs 2023 |  |  | 1,334 |
Current period gross charge-offs 2022 |  |  | 7,214 |
Current period gross charge-offs 2021 |  |  | 248 |
Current period gross charge-offs 2020 |  |  | 232 |
Current period gross charge-offs 2019 |  |  | 725 |
Current period gross charge-offs prior |  |  | 43 |
Current period gross charge-offs revolving |  |  | 131 |
Paycheck Protection Program [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2021 | 6,414 |  | 6,414 |
Total | 6,414 |  | 6,414 |
Construction, commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 10,985 |  | 10,985 |
2022 | 72,755 |  | 72,755 |
2021 | 38,532 |  | 38,532 |
2020 | 16,332 |  | 16,332 |
2019 | 2,122 |  | 2,122 |
Prior | 6,983 |  | 6,983 |
Revolving Loans | 15,151 |  | 15,151 |
Total | 162,860 |  | 162,860 |
Current period gross charge-offs |  |  | 28 |
Current period gross charge-offs prior |  |  | 28 |
Construction, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 32,698 |  | 32,698 |
2022 | 37,155 |  | 37,155 |
2021 | 3,121 |  | 3,121 |
2020 | 679 |  | 679 |
2019 | 1,187 |  | 1,187 |
Prior | 69 |  | 69 |
Revolving Loans | 1,987 |  | 1,987 |
Total | 76,896 |  | 76,896 |
Mortgage, Commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 16,680 |  | 16,680 |
2022 | 314,493 |  | 314,493 |
2021 | 137,186 |  | 137,186 |
2020 | 158,009 |  | 158,009 |
2019 | 55,855 |  | 55,855 |
Prior | 172,010 |  | 172,010 |
Revolving Loans | 25,422 |  | 25,422 |
Total | 879,655 |  | 879,655 |
Mortgage, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 53,288 |  | 53,288 |
2022 | 220,487 |  | 220,487 |
2021 | 126,902 |  | 126,902 |
2020 | 74,419 |  | 74,419 |
2019 | 31,593 |  | 31,593 |
Prior | 157,200 |  | 157,200 |
Revolving Loans | 57,494 |  | 57,494 |
Total | 721,383 |  | 721,383 |
Current period gross charge-offs |  |  | 1,256 |
Current period gross charge-offs 2022 |  |  | 744 |
Current period gross charge-offs 2020 |  |  | 498 |
Current period gross charge-offs prior |  |  | 14 |
Mortgage, Farmland [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 149 |  | 149 |
2022 | 875 |  | 875 |
2021 | 1,809 |  | 1,809 |
2019 | 1,535 |  | 1,535 |
Prior | 1,573 |  | 1,573 |
Revolving Loans | 209 |  | 209 |
Total | 6,150 |  | 6,150 |
Consumer [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 22,977 |  | 22,977 |
2022 | 15,841 |  | 15,841 |
2021 | 4,304 |  | 4,304 |
2020 | 3,331 |  | 3,331 |
2019 | 1,541 |  | 1,541 |
Prior | 1,236 |  | 1,236 |
Revolving Loans | 10,298 |  | 10,298 |
Total | 59,528 |  | 59,528 |
Current period gross charge-offs | 749 | $ 717 | 1,699 | $ 1,357
Current period gross charge-offs 2023 |  |  | 1,083 |
Current period gross charge-offs 2022 |  |  | 280 |
Current period gross charge-offs 2021 |  |  | 200 |
Current period gross charge-offs 2020 |  |  | 31 |
Current period gross charge-offs 2019 |  |  | 48 |
Current period gross charge-offs prior |  |  | 57 |
Risk Grades 1 - 4 |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 150,763 |  | 150,763 |
2022 | 755,082 |  | 755,082 |
2021 | 335,561 |  | 335,561 |
2020 | 253,363 |  | 253,363 |
2019 | 85,983 |  | 85,983 |
Prior | 296,412 |  | 296,412 |
Revolving Loans | 232,476 |  | 232,476 |
Total | 2,109,640 |  | 2,109,640 |
Risk Grades 1 - 4 | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 33,067 |  | 33,067 |
2022 | 140,132 |  | 140,132 |
2021 | 36,097 |  | 36,097 |
2020 | 27,087 |  | 27,087 |
2019 | 11,425 |  | 11,425 |
Prior | 16,388 |  | 16,388 |
Revolving Loans | 131,422 |  | 131,422 |
Total | 395,618 |  | 395,618 |
Risk Grades 1 - 4 | Paycheck Protection Program [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2021 | 6,414 |  | 6,414 |
Total | 6,414 |  | 6,414 |
Risk Grades 1 - 4 | Construction, commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 7,496 |  | 7,496 |
2022 | 65,904 |  | 65,904 |
2021 | 36,512 |  | 36,512 |
2020 | 15,800 |  | 15,800 |
2019 | 2,104 |  | 2,104 |
Prior | 5,759 |  | 5,759 |
Revolving Loans | 11,530 |  | 11,530 |
Total | 145,105 |  | 145,105 |
Risk Grades 1 - 4 | Construction, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 31,389 |  | 31,389 |
2022 | 33,009 |  | 33,009 |
2021 | 2,659 |  | 2,659 |
2020 | 63 |  | 63 |
2019 | 946 |  | 946 |
Prior | 69 |  | 69 |
Revolving Loans | 1,987 |  | 1,987 |
Total | 70,122 |  | 70,122 |
Risk Grades 1 - 4 | Mortgage, Commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 13,996 |  | 13,996 |
2022 | 289,696 |  | 289,696 |
2021 | 123,153 |  | 123,153 |
2020 | 136,403 |  | 136,403 |
2019 | 39,800 |  | 39,800 |
Prior | 132,130 |  | 132,130 |
Revolving Loans | 21,357 |  | 21,357 |
Total | 756,535 |  | 756,535 |
Risk Grades 1 - 4 | Mortgage, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 41,916 |  | 41,916 |
2022 | 209,899 |  | 209,899 |
2021 | 124,713 |  | 124,713 |
2020 | 70,812 |  | 70,812 |
2019 | 28,702 |  | 28,702 |
Prior | 139,827 |  | 139,827 |
Revolving Loans | 55,703 |  | 55,703 |
Total | 671,572 |  | 671,572 |
Risk Grades 1 - 4 | Mortgage, Farmland [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 875 |  | 875 |
2021 | 1,809 |  | 1,809 |
2019 | 1,535 |  | 1,535 |
Prior | 1,573 |  | 1,573 |
Revolving Loans | 209 |  | 209 |
Total | 6,001 |  | 6,001 |
Risk Grades 1 - 4 | Consumer [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 22,899 |  | 22,899 |
2022 | 15,567 |  | 15,567 |
2021 | 4,204 |  | 4,204 |
2020 | 3,198 |  | 3,198 |
2019 | 1,471 |  | 1,471 |
Prior | 666 |  | 666 |
Revolving Loans | 10,268 |  | 10,268 |
Total | 58,273 |  | 58,273 |
Risk Grades 5 - 6 |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 44,693 |  | 44,693 |
2022 | 45,713 |  | 45,713 |
2021 | 20,430 |  | 20,430 |
2020 | 25,198 |  | 25,198 |
2019 | 18,883 |  | 18,883 |
Prior | 41,323 |  | 41,323 |
Revolving Loans | 33,020 |  | 33,020 |
Total | 229,260 |  | 229,260 |
Risk Grades 5 - 6 | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 26,097 |  | 26,097 |
2022 | 2,123 |  | 2,123 |
2021 | 12,446 |  | 12,446 |
2020 | 6,427 |  | 6,427 |
2019 | 790 |  | 790 |
Prior | 1,775 |  | 1,775 |
Revolving Loans | 23,641 |  | 23,641 |
Total | 73,299 |  | 73,299 |
Risk Grades 5 - 6 | Construction, commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 3,370 |  | 3,370 |
2022 | 6,851 |  | 6,851 |
2021 | 2,020 |  | 2,020 |
Prior | 748 |  | 748 |
Revolving Loans | 3,621 |  | 3,621 |
Total | 16,610 |  | 16,610 |
Risk Grades 5 - 6 | Construction, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 1,288 |  | 1,288 |
2022 | 3,566 |  | 3,566 |
2020 | 169 |  | 169 |
2019 | 241 |  | 241 |
Total | 5,264 |  | 5,264 |
Risk Grades 5 - 6 | Mortgage, Commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 2,353 |  | 2,353 |
2022 | 24,797 |  | 24,797 |
2021 | 5,767 |  | 5,767 |
2020 | 16,959 |  | 16,959 |
2019 | 15,943 |  | 15,943 |
Prior | 31,425 |  | 31,425 |
Revolving Loans | 4,065 |  | 4,065 |
Total | 101,309 |  | 101,309 |
Risk Grades 5 - 6 | Mortgage, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 11,372 |  | 11,372 |
2022 | 8,325 |  | 8,325 |
2021 | 184 |  | 184 |
2020 | 1,627 |  | 1,627 |
2019 | 1,895 |  | 1,895 |
Prior | 6,935 |  | 6,935 |
Revolving Loans | 1,663 |  | 1,663 |
Total | 32,001 |  | 32,001 |
Risk Grades 5 - 6 | Mortgage, Farmland [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 149 |  | 149 |
Total | 149 |  | 149 |
Risk Grades 5 - 6 | Consumer [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 64 |  | 64 |
2022 | 51 |  | 51 |
2021 | 13 |  | 13 |
2020 | 16 |  | 16 |
2019 | 14 |  | 14 |
Prior | 440 |  | 440 |
Revolving Loans | 30 |  | 30 |
Total | 628 |  | 628 |
Risk Grade 7 |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 485 |  | 485 |
2022 | 6,797 |  | 6,797 |
2021 | 13,280 |  | 13,280 |
2020 | 11,144 |  | 11,144 |
2019 | 2,007 |  | 2,007 |
Prior | 19,535 |  | 19,535 |
Revolving Loans | 2,748 |  | 2,748 |
Total | 55,996 |  | 55,996 |
Risk Grade 7 | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 3,731 |  | 3,731 |
2021 | 2,460 |  | 2,460 |
2020 | 3,421 |  | 3,421 |
2019 | 825 |  | 825 |
Prior | 36 |  | 36 |
Revolving Loans | 2,620 |  | 2,620 |
Total | 13,093 |  | 13,093 |
Risk Grade 7 | Construction, commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 119 |  | 119 |
2020 | 532 |  | 532 |
2019 | 18 |  | 18 |
Prior | 476 |  | 476 |
Total | 1,145 |  | 1,145 |
Risk Grade 7 | Construction, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 21 |  | 21 |
2022 | 580 |  | 580 |
2021 | 462 |  | 462 |
2020 | 447 |  | 447 |
Total | 1,510 |  | 1,510 |
Risk Grade 7 | Mortgage, Commercial [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 331 |  | 331 |
2021 | 8,266 |  | 8,266 |
2020 | 4,647 |  | 4,647 |
2019 | 112 |  | 112 |
Prior | 8,455 |  | 8,455 |
Total | 21,811 |  | 21,811 |
Risk Grade 7 | Mortgage, Residential [Member] | Real Estate [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 2,263 |  | 2,263 |
2021 | 2,005 |  | 2,005 |
2020 | 1,980 |  | 1,980 |
2019 | 996 |  | 996 |
Prior | 10,438 |  | 10,438 |
Revolving Loans | 128 |  | 128 |
Total | 17,810 |  | 17,810 |
Risk Grade 7 | Consumer [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2023 | 14 |  | 14 |
2022 | 223 |  | 223 |
2021 | 87 |  | 87 |
2020 | 117 |  | 117 |
2019 | 56 |  | 56 |
Prior | 130 |  | 130 |
Total | 627 |  | 627 |
Risk Grade 8 |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 48,160 |  | 48,160 |
2021 | 2,450 |  | 2,450 |
Prior | 379 |  | 379 |
Total | 50,989 |  | 50,989 |
Risk Grade 8 | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |
2022 | 48,160 |  | 48,160 |
2021 | 2,450 |  | 2,450 |
Prior | 379 |  | 379 |
Total | $ 50,989 |  | $ 50,989 |

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