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Loans - Risk Category of Loans by Portfolio Class Based on Year of Origination (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Consumer Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | $ 7,730 | $ 78,526
2023 | 71,936 | 88,996
2022 | 87,638 | 90,697
2021 | 97,014 | 82,843
Prior | 206,544 | 127,928
Term Total | 470,862 | 468,990
Revolving Loans Amortized Cost Basis | 54,381 | 52,918
Grand Total | 525,243 | 521,908
Gross charge-offs - Prior | 10 |
Gross charge-offs - Term Total | 10 |
Gross charge-offs - Grand Total | 10 |
Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 7,730 | 77,298
2023 | 70,715 | 88,695
2022 | 87,343 | 90,139
2021 | 95,907 | 82,680
Prior | 204,574 | 126,596
Term Total | 466,269 | 465,408
Revolving Loans Amortized Cost Basis | 54,250 | 52,904
Grand Total | 520,519 | 518,312
Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 1,228
2023 | 1,221 | 40
2022 | 39 |
2021 | 419 |
Prior | 265 | 134
Term Total | 1,944 | 1,402
Revolving Loans Amortized Cost Basis | 131 |
Grand Total | 2,075 | 1,402
Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 |  | 261
2022 | 256 | 558
2021 | 688 | 163
Prior | 1,705 | 1,198
Term Total | 2,649 | 2,180
Revolving Loans Amortized Cost Basis |  | 14
Grand Total | 2,649 | 2,194
Agricultural Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 12,965 | 30,504
2023 | 30,303 | 38,060
2022 | 37,484 | 37,378
2021 | 36,328 | 26,060
Prior | 109,978 | 91,380
Term Total | 227,058 | 223,382
Revolving Loans Amortized Cost Basis | 92 | 97
Grand Total | 227,150 | 223,479
Agricultural Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 12,965 | 30,504
2023 | 29,399 | 37,199
2022 | 36,136 | 25,168
2021 | 24,112 | 25,874
Prior | 109,568 | 87,107
Term Total | 212,180 | 205,852
Revolving Loans Amortized Cost Basis | 92 | 97
Grand Total | 212,272 | 205,949
Agricultural Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 | 904 | 861
2022 | 1,348 | 14
2021 | 20 |
Prior | 149 | 508
Term Total | 2,421 | 1,383
Grand Total | 2,421 | 1,383
Agricultural Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2022 |  | 12,196
2021 | 12,196 | 186
Prior | 261 | 3,765
Term Total | 12,457 | 16,147
Grand Total | 12,457 | 16,147
Agricultural [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 2,374 | 18,339
2023 | 15,902 | 21,585
2022 | 17,967 | 10,477
2021 | 9,668 | 4,974
Prior | 9,122 | 5,736
Term Total | 55,033 | 61,111
Revolving Loans Amortized Cost Basis | 72,880 | 71,652
Grand Total | 127,913 | 132,763
Agricultural [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 2,374 | 17,787
2023 | 14,989 | 20,330
2022 | 16,672 | 8,356
2021 | 7,781 | 4,476
Prior | 9,122 | 5,736
Term Total | 50,938 | 56,685
Revolving Loans Amortized Cost Basis | 71,052 | 69,824
Grand Total | 121,990 | 126,509
Agricultural [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 38
2023 | 400 | 621
2022 | 661 | 112
2021 | 114 |
Term Total | 1,175 | 771
Revolving Loans Amortized Cost Basis | 330 | 330
Grand Total | 1,505 | 1,101
Agricultural [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 514
2023 | 513 | 634
2022 | 634 | 2,009
2021 | 1,773 | 498
Term Total | 2,920 | 3,655
Revolving Loans Amortized Cost Basis | 1,498 | 1,498
Grand Total | 4,418 | 5,153
Commercial Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 11,583 | 259,096
2023 | 243,569 | 447,816
2022 | 440,065 | 245,273
2021 | 232,697 | 133,524
Prior | 374,067 | 249,366
Term Total | 1,301,981 | 1,335,075
Grand Total | 1,301,981 | 1,335,075
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 11,583 | 224,232
2023 | 208,713 | 438,716
2022 | 431,087 | 245,273
2021 | 231,103 | 122,656
Prior | 362,013 | 235,603
Term Total | 1,244,499 | 1,266,480
Grand Total | 1,244,499 | 1,266,480
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 34,864
2023 | 34,856 | 9,100
2022 | 8,978 |
2021 | 1,594 | 10,793
Prior | 10,646 | 12,968
Term Total | 56,074 | 67,725
Grand Total | 56,074 | 67,725
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Prior | 1,408 | 795
Term Total | 1,408 | 795
Grand Total | 1,408 | 795
Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 |  | 75
Term Total |  | 75
Grand Total |  | 75
Commercial & Industrial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 9,649 | 57,014
2023 | 56,346 | 52,186
2022 | 48,481 | 25,087
2021 | 19,860 | 20,399
Prior | 22,073 | 3,916
Term Total | 156,409 | 158,602
Revolving Loans Amortized Cost Basis | 99,388 | 96,156
Grand Total | 255,797 | 254,758
Gross charge-offs - fiscal year 2021 |  | 565
Gross charge-offs - Prior | 101 |
Gross charge-offs - Term Total | 101 | 565
Gross charge-offs - Grand Total | 101 | 565
Commercial & Industrial [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 9,116 | 56,224
2023 | 55,315 | 51,663
2022 | 48,352 | 24,876
2021 | 19,655 | 20,071
Prior | 21,103 | 3,074
Term Total | 153,541 | 155,908
Revolving Loans Amortized Cost Basis | 94,389 | 90,018
Grand Total | 247,930 | 245,926
Commercial & Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 533 | 716
2023 | 941 | 69
2022 | 109 | 211
2021 | 205 | 146
Prior | 736 | 794
Term Total | 2,524 | 1,936
Revolving Loans Amortized Cost Basis | 4,423 | 6,016
Grand Total | 6,947 | 7,952
Commercial & Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 74
2023 | 90 | 454
2022 | 20 |
Prior | 190 | 48
Term Total | 300 | 576
Revolving Loans Amortized Cost Basis | 576 | 122
Grand Total | 876 | 698
Commercial & Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 |  | 182
Prior | 44 |
Term Total | 44 | 182
Grand Total | 44 | 182
Consumer [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 3,480 | 21,537
2023 | 19,510 | 40,787
2022 | 37,369 | 10,666
2021 | 9,130 | 5,012
Prior | 6,010 | 2,307
Term Total | 75,499 | 80,309
Revolving Loans Amortized Cost Basis | 39 | 44
Grand Total | 75,538 | 80,353
Gross charge-offs - fiscal year 2024 | 48 | 236
Gross charge-offs - fiscal year 2023 | 17 | 51
Gross charge-offs - fiscal year 2022 | 6 | 100
Gross charge-offs - fiscal year 2021 | 10 | 38
Gross charge-offs - Term Total | 81 | 425
Gross charge-offs - Grand Total | 81 | 425
Consumer [Member] | Performing [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 3,480 | 21,511
2023 | 19,510 | 40,729
2022 | 37,299 | 10,666
2021 | 9,130 | 5,006
Prior | 6,003 | 2,305
Term Total | 75,422 | 80,217
Revolving Loans Amortized Cost Basis | 39 | 44
Grand Total | 75,461 | 80,261
Consumer [Member] | Nonperforming [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 26
2023 |  | 58
2022 | 70 |
2021 |  | 6
Prior | 7 | 2
Term Total | 77 | 92
Grand Total | 77 | 92
Other Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 2,810
2022 |  | 16,761
2021 | 16,604 | 5,790
Prior | 10,172 | 4,775
Term Total | 26,776 | 30,136
Grand Total | 26,776 | $ 30,136
Other Loan [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 16,604 |
Prior | 10,172 |
Term Total | 26,776 |
Grand Total | $ 26,776 |

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