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Loans - Balance of loans on nonaccrual status (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income on loans on nonaccrual status		$ 8,000
Reversal of interest income upon placing commercial loans on nonaccrual status	$ 2,000	19,000
Loans on nonaccrual status	2,491,000	2,491,000	$ 947,000
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on nonaccrual status	1,164,000	1,164,000	333,000
Consumer finance | Automobiles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on nonaccrual status	1,269,000	1,269,000	599,000
Consumer finance | Marine and recreational vehicles
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans on nonaccrual status	$ 58,000	$ 58,000	$ 15,000

X

- Definition

Represents the reversal of interest income upon placing loans on nonaccrual status.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
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-Publisher FASB
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- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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