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Loans - Amortized cost basis of loans on nonaccrual status (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Interest income on loans on nonaccrual status		$ 2,000
Reversal of interest income upon placing loans on nonaccrual status	$ 14,000	14,000
Loans on nonaccrual status	1,169,000	1,169,000	$ 1,189,000
Commercial real estate
Loans on nonaccrual status	264,000	264,000
Residential mortgage
Loans on nonaccrual status	149,000	149,000	156,000
Equity lines
Loans on nonaccrual status	107,000	107,000	108,000
Consumer finance | Automobiles
Loans on nonaccrual status	610,000	610,000	842,000
Consumer finance | Marine and recreational vehicles
Loans on nonaccrual status	$ 39,000	$ 39,000	$ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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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/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

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