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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