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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, 2023	Dec. 31, 2022
Loans individually evaluated for credit loss
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 3,495
Loans individually evaluated for credit loss | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	22.80%
Range and weighted average of liquidation expenses	3.00%
Loans individually evaluated for credit loss | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	77.00%
Range and weighted average of liquidation expenses	6.00%
Loans individually evaluated for credit loss | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	60.70%
Range and weighted average of liquidation expenses	5.50%
Impaired Loans
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value		$ 220
Impaired Loans | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments		21.60%
Range and weighted average of liquidation expenses		3.00%
Impaired Loans | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments		97.00%
Range and weighted average of liquidation expenses		6.00%
Impaired Loans | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments		77.70%
Range and weighted average of liquidation expenses		4.90%

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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
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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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.

+ Details

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