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Loans and Allowance for Credit Losses - Summary of Loans by Major Category (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | $ 422,375 |  | $ 402,215 |  |  |
Allowance for credit losses | (5,523) | $ (5,439) | (5,441) | $ (5,858) | $ (5,852) | $ (5,860)
Net deferred origination costs & fees | (55) |  | (18) |  |  |
Loans, net | 416,797 |  | 396,756 |  |  |
Real Estate | Construction |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 19,247 |  | 15,069 |  |  |
Allowance for credit losses | (285) | (246) | (246) | (289) | (268) | (246)
Real Estate | Commercial |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 126,993 |  | 120,184 |  |  |
Allowance for credit losses | (1,688) | (1,572) | (1,572) | (2,023) | (2,044) | (2,245)
Real Estate | Residential |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 158,635 |  | 161,144 |  |  |
Allowance for credit losses | (1,800) | (1,925) | (1,926) | (1,876) | (1,907) | (1,829)
Commercial | Non-Real Estate |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 38,692 |  | 32,007 |  |  |
Allowance for credit losses | (795) | (667) | (667) | (658) | (711) | (759)
Agriculture |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 51,138 |  | 42,835 |  |  |
Allowance for credit losses | (559) | (476) | (476) | (406) | (284) | (228)
Other Consumer |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 12,439 |  | 14,649 |  |  |
Allowance for credit losses | (168) | (261) | (262) | (370) | (392) | (327)
Land Development and Sanitary & Improvement Districts (SIDs) |  |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |  |
Total loans | 15,231 |  | 16,327 |  |  |
Allowance for credit losses | $ (228) | $ (292) | $ (292) | $ (236) | $ (246) | $ (226)

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