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Loans - Amortized cost basis of loans on nonaccrual status (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Interest income on loans on nonaccrual status		$ 0
Reversal of interest income upon placing loans on nonaccrual status	$ 0	14,000
Loans on nonaccrual status	1,376,000	1,376,000	$ 1,189,000
Commercial real estate
Loans on nonaccrual status	264,000	264,000
Residential mortgage
Loans on nonaccrual status	141,000	141,000	156,000
Equity lines
Loans on nonaccrual status	60,000	60,000	108,000
Consumer finance | Automobiles
Loans on nonaccrual status	831,000	831,000	842,000
Consumer finance | Marine and recreational vehicles
Loans on nonaccrual status	$ 80,000	$ 80,000	$ 83,000

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://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

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

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