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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - Level 3 - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Impaired Loans
Fair Value Inputs, Assets, Quantitative Information
Assets, Fair Value Estimate	$ 553	$ 780
Range and weighted average of appraisal adjustments	70.60%	65.20%
Range and weighted average of liquidation expenses	5.20%	5.10%
Impaired Loans | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	21.60%	6.40%
Range and weighted average of liquidation expenses	3.00%	3.00%
Impaired Loans | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	97.00%	97.00%
Range and weighted average of liquidation expenses	6.00%	6.00%
Other Real Estate Owned
Fair Value Inputs, Assets, Quantitative Information
Assets, Fair Value Estimate		$ 487
Range and weighted average of appraisal adjustments		35.90%
Range and weighted average of liquidation expenses		5.00%
Other Real Estate Owned | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments		35.90%
Range and weighted average of liquidation expenses		3.00%
Other Real Estate Owned | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments		35.90%
Range and weighted average of liquidation expenses		6.00%

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- Definition

Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal.

+ References

No definition available.

+ Details

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- Definition

Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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

No definition available.

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