Loans - Risk Category of Loans at Amortized Cost, by Portfolio Segment Based on Year of Origination (Detail) - USD ($)
$ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Grand Total |
$ 2,704,467
|
$ 2,711,959
|
| Consumer Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
34,905
|
52,943
|
| 2025 |
49,655
|
29,131
|
| 2024 |
24,377
|
52,902
|
| 2023 |
46,969
|
71,500
|
| 2022 |
66,040
|
84,077
|
| Prior |
218,842
|
152,521
|
| Term Total |
440,788
|
443,074
|
| Revolving Loans Amortized Cost Basis |
92,821
|
83,338
|
| Revolving Loans Converted to Term |
503
|
631
|
| Grand Total |
534,112
|
527,043
|
| Gross charge-offs - fiscal year 2024 |
|
20
|
| Gross charge-offs - Term Total |
|
20
|
| Gross charge-offs - Revolving Loans Converted to Term |
3
|
|
| Gross charge-offs - Grand Total |
3
|
20
|
| Consumer Real Estate [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
34,326
|
52,684
|
| 2025 |
49,315
|
28,385
|
| 2024 |
23,672
|
52,324
|
| 2023 |
46,466
|
71,008
|
| 2022 |
65,976
|
82,628
|
| Prior |
216,803
|
150,780
|
| Term Total |
436,558
|
437,809
|
| Revolving Loans Amortized Cost Basis |
92,642
|
83,296
|
| Revolving Loans Converted to Term |
466
|
462
|
| Grand Total |
529,666
|
521,567
|
| Consumer Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
579
|
|
| 2022 |
|
131
|
| Prior |
173
|
47
|
| Term Total |
752
|
178
|
| Revolving Loans Amortized Cost Basis |
19
|
19
|
| Grand Total |
771
|
197
|
| Consumer Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
|
259
|
| 2025 |
340
|
746
|
| 2024 |
705
|
578
|
| 2023 |
503
|
492
|
| 2022 |
64
|
1,318
|
| Prior |
1,866
|
1,694
|
| Term Total |
3,478
|
5,087
|
| Revolving Loans Amortized Cost Basis |
160
|
23
|
| Revolving Loans Converted to Term |
37
|
169
|
| Grand Total |
3,675
|
5,279
|
| Agricultural Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
14,799
|
28,079
|
| 2025 |
23,278
|
25,648
|
| 2024 |
22,943
|
24,655
|
| 2023 |
22,252
|
31,796
|
| 2022 |
29,929
|
21,307
|
| Prior |
94,734
|
85,257
|
| Term Total |
207,935
|
216,742
|
| Revolving Loans Amortized Cost Basis |
81
|
88
|
| Revolving Loans Converted to Term |
|
0
|
| Grand Total |
208,016
|
216,830
|
| Agricultural Real Estate [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
14,799
|
28,079
|
| 2025 |
23,037
|
20,758
|
| 2024 |
19,125
|
23,792
|
| 2023 |
20,522
|
30,919
|
| 2022 |
26,982
|
20,242
|
| Prior |
92,625
|
84,889
|
| Term Total |
197,090
|
208,679
|
| Revolving Loans Amortized Cost Basis |
81
|
88
|
| Grand Total |
197,171
|
208,767
|
| Agricultural Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
221
|
|
| 2024 |
19
|
|
| 2023 |
880
|
32
|
| 2022 |
243
|
|
| Prior |
614
|
282
|
| Term Total |
1,977
|
314
|
| Grand Total |
1,977
|
314
|
| Agricultural Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
20
|
4,890
|
| 2024 |
3,799
|
863
|
| 2023 |
850
|
845
|
| 2022 |
2,704
|
1,065
|
| Prior |
1,495
|
86
|
| Term Total |
8,868
|
7,749
|
| Grand Total |
8,868
|
7,749
|
| Agricultural [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
25,642
|
42,982
|
| 2025 |
38,346
|
7,208
|
| 2024 |
5,513
|
6,782
|
| 2023 |
4,926
|
8,966
|
| 2022 |
7,186
|
3,168
|
| Prior |
5,528
|
4,373
|
| Term Total |
87,141
|
73,479
|
| Revolving Loans Amortized Cost Basis |
157,818
|
144,447
|
| Revolving Loans Converted to Term |
|
419
|
| Grand Total |
244,959
|
218,345
|
| Agricultural [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
23,325
|
40,636
|
| 2025 |
34,628
|
7,157
|
| 2024 |
5,018
|
6,692
|
| 2023 |
4,395
|
8,617
|
| 2022 |
6,588
|
3,157
|
| Prior |
5,522
|
4,373
|
| Term Total |
79,476
|
70,632
|
| Revolving Loans Amortized Cost Basis |
131,541
|
126,147
|
| Revolving Loans Converted to Term |
|
419
|
| Grand Total |
211,017
|
197,198
|
| Agricultural [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
1,026
|
53
|
| 2025 |
1,524
|
22
|
| 2024 |
44
|
|
| 2023 |
55
|
305
|
| 2022 |
234
|
11
|
| Term Total |
2,883
|
391
|
| Revolving Loans Amortized Cost Basis |
5,803
|
4,417
|
| Grand Total |
8,686
|
4,808
|
| Agricultural [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
1,291
|
2,293
|
| 2025 |
2,194
|
29
|
| 2024 |
451
|
90
|
| 2023 |
476
|
44
|
| 2022 |
364
|
|
| Prior |
6
|
|
| Term Total |
4,782
|
2,456
|
| Revolving Loans Amortized Cost Basis |
20,474
|
13,883
|
| Grand Total |
25,256
|
16,339
|
| Commercial Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
121,026
|
250,858
|
| 2025 |
223,457
|
133,526
|
| 2024 |
121,210
|
216,668
|
| 2023 |
175,477
|
388,329
|
| 2022 |
359,075
|
189,307
|
| Prior |
300,420
|
168,962
|
| Term Total |
1,300,665
|
1,347,650
|
| Revolving Loans Amortized Cost Basis |
5,489
|
5,369
|
| Revolving Loans Converted to Term |
|
0
|
| Grand Total |
1,306,154
|
1,353,019
|
| Commercial Real Estate [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
119,922
|
244,689
|
| 2025 |
217,312
|
132,260
|
| 2024 |
119,962
|
157,885
|
| 2023 |
148,060
|
362,675
|
| 2022 |
328,667
|
175,569
|
| Prior |
288,782
|
160,103
|
| Term Total |
1,222,705
|
1,233,181
|
| Revolving Loans Amortized Cost Basis |
5,489
|
5,369
|
| Grand Total |
1,228,194
|
1,238,550
|
| Commercial Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
|
4,355
|
| 2025 |
4,364
|
1,211
|
| 2024 |
1,194
|
23,915
|
| 2023 |
24,114
|
12,380
|
| 2022 |
13,912
|
12,381
|
| Prior |
7,665
|
2,088
|
| Term Total |
51,249
|
56,330
|
| Grand Total |
51,249
|
56,330
|
| Commercial Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
1,104
|
1,814
|
| 2025 |
1,781
|
55
|
| 2024 |
54
|
34,868
|
| 2023 |
3,303
|
13,274
|
| 2022 |
16,496
|
1,357
|
| Prior |
3,973
|
6,771
|
| Term Total |
26,711
|
58,139
|
| Grand Total |
26,711
|
58,139
|
| Commercial & Industrial [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
34,361
|
58,784
|
| 2025 |
56,699
|
20,766
|
| 2024 |
16,394
|
40,685
|
| 2023 |
36,698
|
28,758
|
| 2022 |
24,241
|
10,754
|
| Prior |
9,958
|
6,310
|
| Term Total |
178,351
|
166,057
|
| Revolving Loans Amortized Cost Basis |
158,775
|
147,994
|
| Revolving Loans Converted to Term |
|
45
|
| Grand Total |
337,126
|
314,096
|
| Gross charge-offs - fiscal year 2025 |
|
27
|
| Gross charge-offs - fiscal year 2024 |
|
147
|
| Gross charge-offs - fiscal year 2023 |
|
26
|
| Gross charge-offs - fiscal year 2022 |
39
|
|
| Gross charge-offs - Prior |
|
50
|
| Gross charge-offs - Term Total |
39
|
250
|
| Gross charge-offs - Grand Total |
39
|
250
|
| Commercial & Industrial [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
33,062
|
58,239
|
| 2025 |
56,260
|
20,557
|
| 2024 |
15,987
|
38,008
|
| 2023 |
34,447
|
28,674
|
| 2022 |
24,173
|
10,454
|
| Prior |
9,841
|
6,310
|
| Term Total |
173,770
|
162,242
|
| Revolving Loans Amortized Cost Basis |
128,568
|
135,200
|
| Revolving Loans Converted to Term |
|
45
|
| Grand Total |
302,338
|
297,487
|
| Commercial & Industrial [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
1,299
|
545
|
| 2025 |
166
|
42
|
| 2024 |
230
|
2,418
|
| 2023 |
2,251
|
63
|
| 2022 |
53
|
165
|
| Term Total |
3,999
|
3,233
|
| Revolving Loans Amortized Cost Basis |
18,078
|
1,049
|
| Grand Total |
22,077
|
4,282
|
| Commercial & Industrial [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
273
|
33
|
| 2024 |
177
|
259
|
| 2023 |
|
21
|
| 2022 |
15
|
135
|
| Prior |
117
|
|
| Term Total |
582
|
448
|
| Revolving Loans Amortized Cost Basis |
12,129
|
11,745
|
| Grand Total |
12,711
|
12,193
|
| Commercial & Industrial [Member] | Doubtful [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
|
134
|
| Term Total |
|
134
|
| Grand Total |
|
134
|
| Consumer [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Grand Total |
51,526
|
59,493
|
| Consumer [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
6,806
|
24,248
|
| 2025 |
19,415
|
8,135
|
| 2024 |
6,104
|
7,872
|
| 2023 |
5,876
|
15,205
|
| 2022 |
10,586
|
2,686
|
| Prior |
2,112
|
820
|
| Term Total |
50,899
|
58,966
|
| Revolving Loans Amortized Cost Basis |
627
|
527
|
| Grand Total |
51,526
|
59,493
|
| Gross charge-offs - fiscal year 2026 |
135
|
339
|
| Gross charge-offs - fiscal year 2025 |
150
|
58
|
| Gross charge-offs - fiscal year 2024 |
40
|
129
|
| Gross charge-offs - fiscal year 2023 |
28
|
169
|
| Gross charge-offs - fiscal year 2022 |
9
|
61
|
| Gross charge-offs - Prior |
3
|
2
|
| Gross charge-offs - Term Total |
365
|
758
|
| Gross charge-offs - Grand Total |
365
|
758
|
| Consumer [Member] | Performing [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
6,806
|
24,156
|
| 2025 |
19,379
|
8,134
|
| 2024 |
6,085
|
7,852
|
| 2023 |
5,876
|
15,191
|
| 2022 |
10,563
|
2,671
|
| Prior |
2,101
|
816
|
| Term Total |
50,810
|
58,820
|
| Revolving Loans Amortized Cost Basis |
627
|
527
|
| Grand Total |
51,437
|
59,347
|
| Consumer [Member] | Nonperforming [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
|
92
|
| 2025 |
36
|
1
|
| 2024 |
19
|
20
|
| 2023 |
|
14
|
| 2022 |
23
|
15
|
| Prior |
11
|
4
|
| Term Total |
89
|
146
|
| Grand Total |
89
|
146
|
| Other Loan [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
326
|
600
|
| 2025 |
586
|
|
| 2022 |
|
14,870
|
| Prior |
21,662
|
7,663
|
| Term Total |
22,574
|
23,133
|
| Grand Total |
22,574
|
23,133
|
| Other Loan [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2026 |
326
|
600
|
| 2025 |
586
|
|
| 2022 |
|
14,870
|
| Prior |
18,340
|
3,997
|
| Term Total |
19,252
|
19,467
|
| Grand Total |
19,252
|
19,467
|
| Other Loan [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Prior |
|
3,666
|
| Term Total |
|
3,666
|
| Grand Total |
|
$ 3,666
|
| Other Loan [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Prior |
3,322
|
|
| Term Total |
3,322
|
|
| Grand Total |
$ 3,322
|
|