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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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