Loans - Risk Category of Loans at Amortized Cost, by Portfolio Segment Based on Year of Origination (Detail) - USD ($)
$ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Grand Total |
$ 2,624,947
|
$ 2,560,795
|
| Consumer Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
28,019
|
40,400
|
| 2024 |
35,619
|
64,555
|
| 2023 |
56,713
|
80,069
|
| 2022 |
75,541
|
91,137
|
| 2021 |
87,874
|
75,461
|
| Prior |
168,553
|
107,166
|
| Term Total |
452,319
|
458,788
|
| Revolving Loans Amortized Cost Basis |
71,382
|
61,352
|
| Revolving Loans Converted to Term |
505
|
252
|
| Grand Total |
524,206
|
520,392
|
| 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] |
|
|
| 2025 |
28,019
|
40,257
|
| 2024 |
35,476
|
64,316
|
| 2023 |
56,179
|
79,503
|
| 2022 |
74,924
|
89,800
|
| 2021 |
86,557
|
74,996
|
| Prior |
166,676
|
106,007
|
| Term Total |
447,831
|
454,879
|
| Revolving Loans Amortized Cost Basis |
71,216
|
61,097
|
| Revolving Loans Converted to Term |
499
|
237
|
| Grand Total |
519,546
|
516,213
|
| Consumer Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2023 |
|
37
|
| 2022 |
35
|
551
|
| 2021 |
133
|
|
| Prior |
115
|
119
|
| Term Total |
283
|
707
|
| Revolving Loans Amortized Cost Basis |
19
|
19
|
| Grand Total |
302
|
726
|
| Consumer Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
|
143
|
| 2024 |
143
|
239
|
| 2023 |
534
|
529
|
| 2022 |
582
|
786
|
| 2021 |
1,184
|
465
|
| Prior |
1,762
|
1,040
|
| Term Total |
4,205
|
3,202
|
| Revolving Loans Amortized Cost Basis |
147
|
236
|
| Revolving Loans Converted to Term |
6
|
15
|
| Grand Total |
4,358
|
3,453
|
| Agricultural Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
16,486
|
29,513
|
| 2024 |
27,767
|
28,088
|
| 2023 |
26,433
|
34,840
|
| 2022 |
33,191
|
22,983
|
| 2021 |
22,189
|
23,639
|
| Prior |
94,606
|
76,982
|
| Term Total |
220,672
|
216,045
|
| Revolving Loans Amortized Cost Basis |
88
|
92
|
| Grand Total |
220,760
|
216,137
|
| Agricultural Real Estate [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
16,486
|
23,817
|
| 2024 |
22,099
|
28,088
|
| 2023 |
26,433
|
34,469
|
| 2022 |
32,788
|
22,983
|
| 2021 |
21,107
|
23,639
|
| Prior |
94,504
|
76,964
|
| Term Total |
213,417
|
209,960
|
| Revolving Loans Amortized Cost Basis |
88
|
92
|
| Grand Total |
213,505
|
210,052
|
| Agricultural Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2022 |
32
|
|
| Prior |
12
|
13
|
| Term Total |
44
|
13
|
| Grand Total |
44
|
13
|
| Agricultural Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
|
5,696
|
| 2024 |
5,668
|
|
| 2023 |
|
371
|
| 2022 |
371
|
|
| 2021 |
1,082
|
|
| Prior |
90
|
5
|
| Term Total |
7,211
|
6,072
|
| Grand Total |
7,211
|
6,072
|
| Agricultural [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
12,842
|
14,915
|
| 2024 |
10,268
|
10,534
|
| 2023 |
8,303
|
14,381
|
| 2022 |
10,641
|
5,624
|
| 2021 |
4,319
|
3,233
|
| Prior |
5,860
|
3,911
|
| Term Total |
52,233
|
52,598
|
| Revolving Loans Amortized Cost Basis |
106,008
|
99,783
|
| Grand Total |
158,241
|
152,381
|
| Agricultural [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
12,542
|
14,915
|
| 2024 |
10,268
|
10,500
|
| 2023 |
8,193
|
14,381
|
| 2022 |
10,336
|
5,616
|
| 2021 |
4,296
|
3,204
|
| Prior |
5,860
|
3,911
|
| Term Total |
51,495
|
52,527
|
| Revolving Loans Amortized Cost Basis |
104,031
|
98,283
|
| Grand Total |
155,526
|
150,810
|
| Agricultural [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
57
|
|
| 2024 |
|
13
|
| 2022 |
305
|
8
|
| 2021 |
23
|
|
| Term Total |
385
|
21
|
| Revolving Loans Amortized Cost Basis |
336
|
30
|
| Grand Total |
721
|
51
|
| Agricultural [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
243
|
|
| 2024 |
|
21
|
| 2023 |
110
|
|
| 2021 |
|
29
|
| Term Total |
353
|
50
|
| Revolving Loans Amortized Cost Basis |
1,641
|
1,470
|
| Grand Total |
1,994
|
1,520
|
| Commercial Real Estate [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
106,326
|
128,608
|
| 2024 |
145,106
|
234,491
|
| 2023 |
239,745
|
425,696
|
| 2022 |
410,632
|
218,309
|
| 2021 |
212,264
|
111,787
|
| Prior |
229,497
|
189,570
|
| Term Total |
1,343,570
|
1,308,461
|
| Grand Total |
1,343,570
|
1,308,461
|
| Gross charge-offs - Prior |
|
15
|
| Gross charge-offs - Term Total |
|
15
|
| Gross charge-offs - Grand Total |
|
15
|
| Commercial Real Estate [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
103,232
|
128,608
|
| 2024 |
145,106
|
200,192
|
| 2023 |
190,276
|
413,106
|
| 2022 |
392,326
|
218,309
|
| 2021 |
208,429
|
110,435
|
| Prior |
225,400
|
188,239
|
| Term Total |
1,264,769
|
1,258,889
|
| Grand Total |
1,264,769
|
1,258,889
|
| Commercial Real Estate [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
1,350
|
|
| 2023 |
15,380
|
12,590
|
| 2022 |
18,306
|
|
| 2021 |
3,835
|
1,352
|
| Prior |
1,924
|
753
|
| Term Total |
40,795
|
14,695
|
| Grand Total |
40,795
|
14,695
|
| Commercial Real Estate [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
1,744
|
|
| 2024 |
|
34,299
|
| 2023 |
34,089
|
|
| Prior |
2,173
|
578
|
| Term Total |
38,006
|
34,877
|
| Grand Total |
38,006
|
34,877
|
| Commercial Real Estate [Member] | Doubtful [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Term Total |
0
|
|
| Commercial & Industrial [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
22,324
|
31,972
|
| 2024 |
27,387
|
55,066
|
| 2023 |
44,871
|
39,694
|
| 2022 |
33,460
|
15,235
|
| 2021 |
13,010
|
13,506
|
| Prior |
10,017
|
1,738
|
| Term Total |
151,069
|
157,211
|
| Revolving Loans Amortized Cost Basis |
142,397
|
117,386
|
| Revolving Loans Converted to Term |
78
|
222
|
| Grand Total |
293,544
|
274,819
|
| Gross charge-offs - fiscal year 2022 |
25
|
|
| Gross charge-offs - fiscal year 2021 |
|
101
|
| Gross charge-offs - Term Total |
25
|
101
|
| Gross charge-offs - Revolving Loans Converted to Term |
|
5
|
| Gross charge-offs - Grand Total |
25
|
106
|
| Commercial & Industrial [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
22,324
|
31,933
|
| 2024 |
27,351
|
54,581
|
| 2023 |
44,450
|
39,665
|
| 2022 |
33,460
|
15,047
|
| 2021 |
12,801
|
13,480
|
| Prior |
9,655
|
1,294
|
| Term Total |
150,041
|
156,000
|
| Revolving Loans Amortized Cost Basis |
138,301
|
113,446
|
| Revolving Loans Converted to Term |
78
|
222
|
| Grand Total |
288,420
|
269,668
|
| Commercial & Industrial [Member] | Special Mention [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
|
137
|
| 2023 |
117
|
|
| 2022 |
|
188
|
| 2021 |
177
|
26
|
| Prior |
362
|
416
|
| Term Total |
656
|
767
|
| Revolving Loans Amortized Cost Basis |
550
|
459
|
| Grand Total |
1,206
|
1,226
|
| Commercial & Industrial [Member] | Substandard [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
|
39
|
| 2024 |
36
|
348
|
| 2023 |
304
|
29
|
| 2021 |
32
|
|
| Prior |
|
28
|
| Term Total |
372
|
444
|
| Revolving Loans Amortized Cost Basis |
3,546
|
3,481
|
| Grand Total |
3,918
|
3,925
|
| Consumer [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Grand Total |
59,973
|
63,627
|
| Consumer [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
12,148
|
13,477
|
| 2024 |
10,836
|
13,521
|
| 2023 |
10,390
|
27,304
|
| 2022 |
20,659
|
5,952
|
| 2021 |
4,085
|
2,314
|
| Prior |
1,589
|
582
|
| Term Total |
59,707
|
63,150
|
| Revolving Loans Amortized Cost Basis |
266
|
477
|
| Grand Total |
59,973
|
63,627
|
| Gross charge-offs - fiscal year 2025 |
88
|
201
|
| Gross charge-offs - fiscal year 2024 |
45
|
69
|
| Gross charge-offs - fiscal year 2023 |
95
|
62
|
| Gross charge-offs - fiscal year 2022 |
162
|
14
|
| Gross charge-offs - fiscal year 2021 |
52
|
|
| Gross charge-offs - Term Total |
442
|
346
|
| Gross charge-offs - Grand Total |
442
|
346
|
| Consumer [Member] | Performing [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
12,148
|
13,437
|
| 2024 |
10,836
|
13,521
|
| 2023 |
10,385
|
27,264
|
| 2022 |
20,640
|
5,917
|
| 2021 |
4,077
|
2,310
|
| Prior |
1,586
|
582
|
| Term Total |
59,672
|
63,031
|
| Revolving Loans Amortized Cost Basis |
266
|
477
|
| Grand Total |
59,938
|
63,508
|
| Consumer [Member] | Nonperforming [Member] | Payment Performance [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
|
40
|
| 2023 |
5
|
40
|
| 2022 |
19
|
35
|
| 2021 |
8
|
4
|
| Prior |
3
|
|
| Term Total |
35
|
119
|
| Grand Total |
35
|
119
|
| Other Loan [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
600
|
|
| 2022 |
|
15,829
|
| 2021 |
15,666
|
5,068
|
| Prior |
8,387
|
4,081
|
| Term Total |
24,653
|
24,978
|
| Grand Total |
24,653
|
24,978
|
| Other Loan [Member] | Pass [Member] |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2025 |
600
|
|
| 2022 |
|
15,829
|
| 2021 |
15,666
|
5,068
|
| Prior |
8,387
|
4,081
|
| Term Total |
24,653
|
24,978
|
| Grand Total |
$ 24,653
|
$ 24,978
|