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Loans - Risk Category of Loans by Portfolio Class Based on Year of Origination (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Grand Total | $ 2,559,126 | $ 2,578,472
Consumer Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 21,403 | 78,526
2023 | 69,543 | 88,996
2022 | 84,159 | 90,697
2021 | 95,127 | 82,843
2020 | 81,032 | 32,548
Prior | 118,375 | 95,380
Term Total | 469,639 | 468,990
Revolving Loans Amortized Cost Basis | 56,415 | 52,918
Grand Total | 526,054 | 521,908
Gross charge-offs - Prior | 13 |
Gross charge-offs - Term Total | 13 |
Gross charge-offs - Grand Total | 13 |
Consumer Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 21,403 | 77,298
2023 | 69,543 | 88,695
2022 | 83,893 | 90,139
2021 | 94,023 | 82,680
2020 | 80,808 | 32,302
Prior | 116,593 | 94,294
Term Total | 466,263 | 465,408
Revolving Loans Amortized Cost Basis | 56,296 | 52,904
Grand Total | 522,559 | 518,312
Consumer Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 1,228
2023 |  | 40
2022 | 38 |
2021 | 419 |
Prior | 258 | 134
Term Total | 715 | 1,402
Revolving Loans Amortized Cost Basis | 104 |
Grand Total | 819 | 1,402
Consumer Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2023 |  | 261
2022 | 228 | 558
2021 | 685 | 163
2020 | 224 | 246
Prior | 1,524 | 952
Term Total | 2,661 | 2,180
Revolving Loans Amortized Cost Basis | 15 | 14
Grand Total | 2,676 | 2,194
Agricultural Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 24,712 | 30,504
2023 | 29,775 | 38,060
2022 | 36,405 | 37,378
2021 | 23,766 | 26,060
2020 | 24,960 | 18,864
Prior | 82,570 | 72,516
Term Total | 222,188 | 223,382
Revolving Loans Amortized Cost Basis | 92 | 97
Grand Total | 222,280 | 223,479
Agricultural Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 18,712 | 30,504
2023 | 28,876 | 37,199
2022 | 35,667 | 25,168
2021 | 23,766 | 25,874
2020 | 24,960 | 18,456
Prior | 82,495 | 68,651
Term Total | 214,476 | 205,852
Revolving Loans Amortized Cost Basis | 92 | 97
Grand Total | 214,568 | 205,949
Agricultural Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 6,000 |
2023 | 899 | 861
2022 | 738 | 14
2020 |  | 149
Prior |  | 359
Term Total | 7,637 | 1,383
Grand Total | 7,637 | 1,383
Agricultural Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2022 |  | 12,196
2021 |  | 186
2020 |  | 259
Prior | 75 | 3,506
Term Total | 75 | 16,147
Grand Total | 75 | 16,147
Agricultural [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 9,688 | 18,339
2023 | 13,509 | 21,585
2022 | 16,714 | 10,477
2021 | 7,045 | 4,974
2020 | 3,781 | 3,856
Prior | 4,356 | 1,880
Term Total | 55,093 | 61,111
Revolving Loans Amortized Cost Basis | 88,164 | 71,652
Grand Total | 143,257 | 132,763
Agricultural [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 5,878 | 17,787
2023 | 13,472 | 20,330
2022 | 16,645 | 8,356
2021 | 7,035 | 4,476
2020 | 3,739 | 3,856
Prior | 4,356 | 1,880
Term Total | 51,125 | 56,685
Revolving Loans Amortized Cost Basis | 86,671 | 69,824
Grand Total | 137,796 | 126,509
Agricultural [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 3,810 | 38
2023 | 26 | 621
2022 | 69 | 112
2021 | 10 |
Term Total | 3,915 | 771
Revolving Loans Amortized Cost Basis | 1,493 | 330
Grand Total | 5,408 | 1,101
Agricultural [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 514
2023 | 11 | 634
2022 |  | 2,009
2021 |  | 498
2020 | 42 |
Term Total | 53 | 3,655
Revolving Loans Amortized Cost Basis |  | 1,498
Grand Total | 53 | 5,153
Commercial Real Estate [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 47,413 | 259,096
2023 | 244,443 | 447,816
2022 | 436,437 | 245,273
2021 | 226,275 | 133,524
2020 | 120,988 | 136,851
Prior | 225,700 | 112,515
Term Total | 1,301,256 | 1,335,075
Grand Total | 1,301,256 | 1,335,075
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 47,413 | 224,232
2023 | 209,715 | 438,716
2022 | 436,437 | 245,273
2021 | 225,307 | 122,656
2020 | 119,607 | 136,225
Prior | 224,300 | 99,378
Term Total | 1,262,779 | 1,266,480
Grand Total | 1,262,779 | 1,266,480
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 34,864
2023 | 34,728 | 9,100
2021 | 968 | 10,793
2020 | 1,381 | 626
Prior |  | 12,342
Term Total | 37,077 | 67,725
Grand Total | 37,077 | 67,725
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Prior | 1,400 | 795
Term Total | 1,400 | 795
Grand Total | 1,400 | 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 | 17,621 | 57,014
2023 | 57,377 | 52,186
2022 | 45,361 | 25,087
2021 | 18,326 | 20,399
2020 | 16,776 | 2,610
Prior | 2,931 | 1,306
Term Total | 158,392 | 158,602
Revolving Loans Amortized Cost Basis | 109,835 | 96,156
Grand Total | 268,227 | 254,758
Gross charge-offs - fiscal year 2021 |  | 565
Gross charge-offs - fiscal year 2020 | 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 | 17,173 | 56,224
2023 | 56,402 | 51,663
2022 | 45,307 | 24,876
2021 | 18,127 | 20,071
2020 | 16,776 | 2,142
Prior | 2,040 | 932
Term Total | 155,825 | 155,908
Revolving Loans Amortized Cost Basis | 105,738 | 90,018
Grand Total | 261,563 | 245,926
Commercial & Industrial [Member] | Special Mention [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 448 | 716
2023 | 891 | 69
2022 | 40 | 211
2021 | 199 | 146
2020 |  | 437
Prior | 721 | 357
Term Total | 2,299 | 1,936
Revolving Loans Amortized Cost Basis | 3,476 | 6,016
Grand Total | 5,775 | 7,952
Commercial & Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 74
2023 | 84 | 454
2022 | 14 |
2020 |  | 31
Prior | 170 | 17
Term Total | 268 | 576
Revolving Loans Amortized Cost Basis | 621 | 122
Grand Total | 889 | 698
Commercial & Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 |  | 182
Term Total |  | 182
Grand Total |  | 182
Consumer [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Grand Total | 71,603 | 80,353
Consumer [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 7,478 | 21,537
2023 | 17,603 | 40,787
2022 | 33,857 | 10,666
2021 | 7,892 | 5,012
2020 | 3,512 | 1,825
Prior | 1,220 | 482
Term Total | 71,562 | 80,309
Revolving Loans Amortized Cost Basis | 41 | 44
Grand Total | 71,603 | 80,353
Gross charge-offs - fiscal year 2024 | 83 | 236
Gross charge-offs - fiscal year 2023 | 27 | 51
Gross charge-offs - fiscal year 2022 | 43 | 100
Gross charge-offs - fiscal year 2021 | 10 | 38
Gross charge-offs - Term Total | 163 | 425
Gross charge-offs - Grand Total | 163 | 425
Consumer [Member] | Performing [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 | 7,478 | 21,511
2023 | 17,545 | 40,729
2022 | 33,802 | 10,666
2021 | 7,892 | 5,006
2020 | 3,507 | 1,825
Prior | 1,220 | 480
Term Total | 71,444 | 80,217
Revolving Loans Amortized Cost Basis | 41 | 44
Grand Total | 71,485 | 80,261
Consumer [Member] | Nonperforming [Member] | Payment Performance [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 26
2023 | 58 | 58
2022 | 55 |
2021 |  | 6
2020 | 5 |
Prior |  | 2
Term Total | 118 | 92
Grand Total | 118 | 92
Other Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2024 |  | 2,810
2022 |  | 16,761
2021 | 16,604 | 5,790
2020 | 5,464 | 445
Prior | 4,381 | 4,330
Term Total | 26,449 | 30,136
Grand Total | 26,449 | $ 30,136
Other Loan [Member] | Pass [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2021 | 16,604 |
2020 | 5,464 |
Prior | 4,381 |
Term Total | 26,449 |
Grand Total | $ 26,449 |

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