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Loans - Amortized cost basis of loans on nonaccrual status (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Interest income on loans on nonaccrual status		$ 10,000
Reversal of interest income upon placing commercial loans on nonaccrual status	$ 1,000	9,000
Loans on nonaccrual status	1,729,000	1,729,000	$ 1,298,000
Commercial business
Loans on nonaccrual status	92,000	92,000
Residential mortgage
Loans on nonaccrual status	516,000	516,000	320,000
Equity lines
Loans on nonaccrual status	20,000	20,000	77,000
Other consumer
Loans on nonaccrual status			9,000
Consumer finance | Automobiles
Loans on nonaccrual status	1,008,000	1,008,000	$ 892,000
Consumer finance | Marine and recreational vehicles
Loans on nonaccrual status	$ 93,000	$ 93,000

X

- Definition

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

+ References

No definition available.

+ Details

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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

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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