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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
Mar. 31, 2023
Mar. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 $ 153,430  
2022 813,467  
2021 392,148  
2020 317,771  
2019 116,695  
Prior 394,254  
Revolving Loans 269,560  
Total 2,457,325  
Current period gross charge-offs 1,309 $ 2,819
Current period gross charge-offs 2023 38  
Current period gross charge-offs 2022 97  
Current period gross charge-offs 2021 703  
Current period gross charge-offs 2020 12  
Current period gross charge-offs 2019 36  
Current period gross charge-offs prior 28  
Current period gross charge-offs revolving 395  
Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 46,953  
2022 220,213  
2021 63,738  
2020 45,098  
2019 17,351  
Prior 22,125  
Revolving Loans 155,617  
Total 571,095  
Current period gross charge-offs 799 2,401
Current period gross charge-offs 2021 664  
Current period gross charge-offs prior 9  
Current period gross charge-offs revolving 126  
Paycheck Protection Program [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,988  
Total 7,988  
Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 8,488  
2022 57,929  
2021 62,022  
2020 17,298  
2019 2,118  
Prior 9,803  
Revolving Loans 22,491  
Total 180,149  
Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 20,105  
2022 51,254  
2021 16,477  
2020 1,113  
2019 998  
Revolving Loans 2,456  
Total 92,403  
Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 28,993  
2022 265,470  
2021 128,206  
2020 172,618  
2019 59,121  
Prior 192,737  
Revolving Loans 20,771  
Total 867,916  
Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 30,765  
2022 199,078  
2021 106,718  
2020 76,933  
2019 33,049  
Prior 165,249  
Revolving Loans 60,681  
Total 672,473  
Current period gross charge-offs 13  
Current period gross charge-offs prior 13  
Mortgage, Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 729  
2021 1,328  
2019 1,657  
Prior 2,450  
Revolving Loans 230  
Total 6,394  
Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 18,126  
2022 18,794  
2021 5,671  
2020 4,711  
2019 2,401  
Prior 1,890  
Revolving Loans 7,314  
Total 58,907  
Current period gross charge-offs 497 $ 279
Current period gross charge-offs 2023 38  
Current period gross charge-offs 2022 97  
Current period gross charge-offs 2021 39  
Current period gross charge-offs 2020 12  
Current period gross charge-offs 2019 36  
Current period gross charge-offs prior 6  
Current period gross charge-offs revolving 269  
Risk Grades 1 - 4    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 153,257  
2022 714,961  
2021 363,931  
2020 285,509  
2019 97,783  
Prior 336,360  
Revolving Loans 222,412  
Total 2,174,213  
Risk Grades 1 - 4 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 46,836  
2022 145,311  
2021 54,533  
2020 36,707  
2019 15,681  
Prior 20,557  
Revolving Loans 120,901  
Total 440,526  
Risk Grades 1 - 4 | Paycheck Protection Program [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 7,988  
Total 7,988  
Risk Grades 1 - 4 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 8,488  
2022 52,358  
2021 55,721  
2020 16,576  
2019 2,118  
Prior 8,803  
Revolving Loans 12,209  
Total 156,273  
Risk Grades 1 - 4 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 20,084  
2022 50,390  
2021 15,528  
2020 1,113  
2019 998  
Revolving Loans 2,456  
Total 90,569  
Risk Grades 1 - 4 | Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 28,993  
2022 250,028  
2021 117,823  
2020 153,436  
2019 44,957  
Prior 151,324  
Revolving Loans 20,171  
Total 766,732  
Risk Grades 1 - 4 | Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 30,743  
2022 197,427  
2021 105,466  
2020 73,162  
2019 30,080  
Prior 151,984  
Revolving Loans 59,207  
Total 648,069  
Risk Grades 1 - 4 | Mortgage, Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 729  
2021 1,328  
2019 1,657  
Prior 2,372  
Revolving Loans 184  
Total 6,270  
Risk Grades 1 - 4 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 18,113  
2022 18,718  
2021 5,544  
2020 4,515  
2019 2,292  
Prior 1,320  
Revolving Loans 7,284  
Total 57,786  
Risk Grades 5 - 6    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 152  
2022 56,961  
2021 20,536  
2020 30,488  
2019 16,370  
Prior 41,756  
Revolving Loans 37,678  
Total 203,941  
Risk Grades 5 - 6 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 117  
2022 34,640  
2021 9,205  
2020 8,391  
2019 467  
Prior 1,450  
Revolving Loans 25,942  
Total 80,212  
Risk Grades 5 - 6 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 5,571  
2021 6,301  
2020 722  
Prior 710  
Revolving Loans 10,282  
Total 23,586  
Risk Grades 5 - 6 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 949  
Total 949  
Risk Grades 5 - 6 | Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 15,442  
2021 4,039  
2020 19,182  
2019 13,390  
Prior 32,237  
Revolving Loans 500  
Total 84,790  
Risk Grades 5 - 6 | Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 22  
2022 1,282  
2021 24  
2020 2,112  
2019 2,508  
Prior 6,852  
Revolving Loans 878  
Total 13,678  
Risk Grades 5 - 6 | Mortgage, Farmland [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 78  
Revolving Loans 46  
Total 124  
Risk Grades 5 - 6 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 13  
2022 26  
2021 18  
2020 81  
2019 5  
Prior 429  
Revolving Loans 30  
Total 602  
Risk Grade 7    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 21  
2022 41,545  
2021 7,681  
2020 1,774  
2019 2,542  
Prior 16,138  
Revolving Loans 9,470  
Total 79,171  
Risk Grade 7 | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 40,262  
2019 1,203  
Prior 118  
Revolving Loans 8,774  
Total 50,357  
Risk Grade 7 | Construction, commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Prior 290  
Total 290  
Risk Grade 7 | Construction, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 21  
2022 864  
Total 885  
Risk Grade 7 | Mortgage, Commercial [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 6,344  
2019 774  
Prior 9,176  
Revolving Loans 100  
Total 16,394  
Risk Grade 7 | Mortgage, Residential [Member] | Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 369  
2021 1,228  
2020 1,659  
2019 461  
Prior 6,413  
Revolving Loans 596  
Total 10,726  
Risk Grade 7 | Consumer [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2022 50  
2021 109  
2020 115  
2019 104  
Prior 141  
Total $ 519