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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	Dec. 31, 2024	Dec. 31, 2023
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	$ 738
Level 3
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	738
Loans individually evaluated for credit loss | Level 3
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 22,164	$ 4,740
Loans individually evaluated for credit loss | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	3.00%	22.80%
Range and weighted average of liquidation expenses	0.00%	3.00%
Loans individually evaluated for credit loss | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	111.90%	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	59.60%	63.60%
Range and weighted average of liquidation expenses	5.60%	5.20%
Other Real Estate Owned | Level 3
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 738
Other Real Estate Owned | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	0.00%
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	10.00%
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	9.70%
Range and weighted average of liquidation expenses	5.00%

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Fair value portion of asset recognized for present right to economic benefit.

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