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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