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Allowance for Credit Losses - Based On the Most Recent Analysis Performed, the Risk Category of Loans, By Type and Year of Originations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total $ 8,208 $ 8,208 $ 9,253
Current-period gross charge-offs 666 855  
Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 362,236 362,236  
2022 687,480 687,480  
2021 459,900 459,900  
2020 311,681 311,681  
2019 205,418 205,418  
Prior 444,378 444,378  
Revolving Loans 283,797 283,797  
Financing Receivable, before Allowance for Credit Loss, Total 2,754,890 2,754,890  
2023   1  
2022   700  
2021   40  
2020   6  
2019   10  
Prior   93  
Revolving Loans, Charge-offs   5  
Current-period gross charge-offs   855  
Commercial And Agriculture [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total 3,587 3,587 859
Current-period gross charge-offs 614 754  
Commercial And Agriculture [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 61,537 61,537  
2022 72,407 72,407  
2021 46,780 46,780  
2020 14,177 14,177  
2019 7,701 7,701  
Prior 15,747 15,747  
Revolving Loans 83,528 83,528  
Financing Receivable, before Allowance for Credit Loss, Total 301,877 301,877  
2022   673  
Prior   81  
Current-period gross charge-offs   754  
Commercial And Agriculture [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 60,223 60,223  
2022 72,407 72,407  
2021 46,378 46,378  
2020 12,263 12,263  
2019 7,418 7,418  
Prior 15,439 15,439  
Revolving Loans 79,760 79,760  
Financing Receivable, before Allowance for Credit Loss, Total 293,888 293,888  
Commercial And Agriculture [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 906 906  
2021 340 340  
2020 1,797 1,797  
Prior 113 113  
Revolving Loans 176 176  
Financing Receivable, before Allowance for Credit Loss, Total 3,332 3,332  
Commercial And Agriculture [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 408 408  
2021 62 62  
2020 117 117  
2019 283 283  
Prior 195 195  
Revolving Loans 3,592 3,592  
Financing Receivable, before Allowance for Credit Loss, Total 4,657 4,657  
Commercial And Agriculture [Member] | Doubtful [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2022 0 0  
Financing Receivable, before Allowance for Credit Loss, Total 0 0  
Commercial Real Estate Owner Occupied [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total 121 121 110
Commercial Real Estate Owner Occupied [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 29,262 29,262  
2022 82,180 82,180  
2021 68,509 68,509  
2020 58,121 58,121  
2019 33,656 33,656  
Prior 97,635 97,635  
Revolving Loans 6,488 6,488  
Financing Receivable, before Allowance for Credit Loss, Total 375,851 375,851  
Commercial Real Estate Owner Occupied [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 28,733 28,733  
2022 81,961 81,961  
2021 67,764 67,764  
2020 57,827 57,827  
2019 30,558 30,558  
Prior 96,394 96,394  
Revolving Loans 6,488 6,488  
Financing Receivable, before Allowance for Credit Loss, Total 369,725 369,725  
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 529 529  
2022 219 219  
2021 745 745  
2020 294 294  
2019 3,098 3,098  
Prior 287 287  
Financing Receivable, before Allowance for Credit Loss, Total 5,172 5,172  
Commercial Real Estate Owner Occupied [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
Prior 954 954  
Financing Receivable, before Allowance for Credit Loss, Total 954 954  
Commercial Real Estate Non Owner Occupied [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total     1,164
Commercial Real Estate Non Owner Occupied [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 118,399 118,399  
2022 267,696 267,696  
2021 202,108 202,108  
2020 138,388 138,388  
2019 122,046 122,046  
Prior 230,572 230,572  
Revolving Loans 23,723 23,723  
Financing Receivable, before Allowance for Credit Loss, Total 1,102,932 1,102,932  
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 118,399 118,399  
2022 261,880 261,880  
2021 195,881 195,881  
2020 138,388 138,388  
2019 121,917 121,917  
Prior 219,770 219,770  
Revolving Loans 23,446 23,446  
Financing Receivable, before Allowance for Credit Loss, Total 1,079,681 1,079,681  
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2022 5,816 5,816  
2021 6,227 6,227  
Prior 7,373 7,373  
Revolving Loans 277 277  
Financing Receivable, before Allowance for Credit Loss, Total 19,693 19,693  
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2019 129 129  
Prior 3,429 3,429  
Financing Receivable, before Allowance for Credit Loss, Total 3,558 3,558  
Residential Portfolio Segment [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total 3,334 3,334 5,097
Current-period gross charge-offs 1 12  
Residential Portfolio Segment [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 62,756 62,756  
2022 107,004 107,004  
2021 96,580 96,580  
2020 73,215 73,215  
2019 35,767 35,767  
Prior 83,892 83,892  
Revolving Loans 155,090 155,090  
Financing Receivable, before Allowance for Credit Loss, Total 614,304 614,304  
Prior   12  
Current-period gross charge-offs   12  
Residential Portfolio Segment [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 62,756 62,756  
2022 106,652 106,652  
2021 95,914 95,914  
2020 73,032 73,032  
2019 35,184 35,184  
Prior 80,593 80,593  
Revolving Loans 153,753 153,753  
Financing Receivable, before Allowance for Credit Loss, Total 607,884 607,884  
Residential Portfolio Segment [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2021 224 224  
2020 98 98  
Prior 250 250  
Revolving Loans 55 55  
Financing Receivable, before Allowance for Credit Loss, Total 627 627  
Residential Portfolio Segment [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2022 352 352  
2021 442 442  
2020 85 85  
2019 583 583  
Prior 3,049 3,049  
Revolving Loans 1,282 1,282  
Financing Receivable, before Allowance for Credit Loss, Total 5,793 5,793  
Real Estate Construction [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total     219
Real Estate Construction [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 62,658 62,658  
2022 138,394 138,394  
2021 32,839 32,839  
2020 17,582 17,582  
2019 2,839 2,839  
Prior 2,708 2,708  
Revolving Loans 12,271 12,271  
Financing Receivable, before Allowance for Credit Loss, Total 269,291 269,291  
Real Estate Construction [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 62,658 62,658  
2022 137,265 137,265  
2021 31,871 31,871  
2020 15,563 15,563  
2019 2,678 2,678  
Prior 2,708 2,708  
Revolving Loans 12,271 12,271  
Financing Receivable, before Allowance for Credit Loss, Total 265,014 265,014  
Real Estate Construction [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2022 1,129 1,129  
2021 926 926  
2020 2,019 2,019  
Financing Receivable, before Allowance for Credit Loss, Total 4,074 4,074  
Real Estate Construction [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2021 42 42  
2019 161 161  
Financing Receivable, before Allowance for Credit Loss, Total 203 203  
Farm Real Estate [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total     7
Farm Real Estate [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 816 816  
2022 987 987  
2021 2,309 2,309  
2020 4,552 4,552  
Prior 13,478 13,478  
Revolving Loans 1,161 1,161  
Financing Receivable, before Allowance for Credit Loss, Total 24,109 24,109  
Farm Real Estate [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 816 816  
2022 987 987  
2021 2,309 2,309  
2020 4,552 4,552  
2019 806 806  
Prior 13,295 13,295  
Revolving Loans 1,161 1,161  
Financing Receivable, before Allowance for Credit Loss, Total 23,926 23,926  
Farm Real Estate [Member] | Special Mention [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
Prior 183 183  
Financing Receivable, before Allowance for Credit Loss, Total 183 183  
Lease Financing Receivables [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total 942 942 1,381
Lease Financing Receivables [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 21,794 21,794  
2022 14,071 14,071  
2021 6,658 6,658  
2020 3,754 3,754  
2019 1,964 1,964  
Prior 18 18  
Financing Receivable, before Allowance for Credit Loss, Total 48,259 48,259  
Lease Financing Receivables [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 21,794 21,794  
2022 14,071 14,071  
2021 6,605 6,605  
2020 3,754 3,754  
2019 1,964 1,964  
Prior 18 18  
Financing Receivable, before Allowance for Credit Loss, Total 48,206 48,206  
Lease Financing Receivables [Member] | Doubtful [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2021 53 53  
Financing Receivable, before Allowance for Credit Loss, Total 53 53  
Consumer And Other [Member]      
Financing Receivable Recorded Investment [Line Items]      
Financing Receivable, before Allowance for Credit Loss, Total 224 224 $ 416
Current-period gross charge-offs 51 89  
Consumer And Other [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 5,014 5,014  
2022 4,741 4,741  
2021 4,117 4,117  
2020 1,892 1,892  
2019 639 639  
Prior 328 328  
Revolving Loans 1,536 1,536  
Financing Receivable, before Allowance for Credit Loss, Total 18,267 18,267  
2023   1  
2022   27  
2021   40  
2020   6  
2019   10  
Revolving Loans, Charge-offs   5  
Current-period gross charge-offs   89  
Consumer And Other [Member] | Pass [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2023 5,014 5,014  
2022 4,741 4,741  
2021 4,103 4,103  
2020 1,875 1,875  
2019 639 639  
Prior 322 322  
Revolving Loans 1,536 1,536  
Financing Receivable, before Allowance for Credit Loss, Total 18,230 18,230  
Consumer And Other [Member] | Substandard [Member] | Term Loans Amortized Cost Basis by Origination Year [Member]      
Financing Receivable Recorded Investment [Line Items]      
2021 14 14  
2020 17 17  
Prior 6 6  
Financing Receivable, before Allowance for Credit Loss, Total $ 37 $ 37