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Loans - Balance of loans on nonaccrual status (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Interest income on loans on nonaccrual status	$ 3,000
Reversal of interest income upon placing commercial loans on nonaccrual status	17,000
Loans on nonaccrual status	2,164,000	$ 947,000
Residential mortgage
Loans on nonaccrual status	1,189,000	333,000
Consumer finance | Automobiles
Loans on nonaccrual status	911,000	599,000
Consumer finance | Marine and recreational vehicles
Loans on nonaccrual status	$ 64,000	$ 15,000

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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