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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	$ 1,497
Level 3
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	1,497
Loans individually evaluated for credit loss | Level 3
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 7,445	$ 4,740
Loans individually evaluated for credit loss | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	22.80%	22.80%
Range and weighted average of liquidation expenses	3.00%	3.00%
Loans individually evaluated for credit loss | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	94.00%	82.40%
Range and weighted average of liquidation expenses	6.00%	6.00%
Loans individually evaluated for credit loss | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	59.20%	63.60%
Range and weighted average of liquidation expenses	5.70%	5.20%
Other Real Estate Owned | Level 3
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	$ 1,497
Other Real Estate Owned | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	1.00%
Range and weighted average of liquidation expenses	3.00%
Other Real Estate Owned | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	1.00%
Range and weighted average of liquidation expenses	6.00%
Other Real Estate Owned | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	1.00%
Range and weighted average of liquidation expenses	4.50%

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+ References

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- Definition

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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

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