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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