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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	Jun. 30, 2025	Dec. 31, 2024
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	$ 711
Loans individually evaluated for credit loss	16,785
Level 3
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	711	$ 738
Loans individually evaluated for credit loss	16,785
Loans individually evaluated for credit loss
Fair Value Inputs, Assets, Quantitative Information
Loans individually evaluated for credit loss		22,164
Loans individually evaluated for credit loss | Level 3
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	16,785	22,164
Loans individually evaluated for credit loss		22,164
Other Real Estate Owned
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned		738
Other Real Estate Owned | Level 3
Fair Value Inputs, Assets, Quantitative Information
Other real estate owned	$ 711	$ 738
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	2.60%	3.00%
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	98.20%	111.90%
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	71.50%	59.60%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	0.00%	0.00%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	10.00%	10.00%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	9.70%	9.70%
Measurement Input, Liquidation expenses | Loans individually evaluated for credit loss | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	3.00%	0.00%
Measurement Input, Liquidation expenses | Loans individually evaluated for credit loss | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	6.00%	6.00%
Measurement Input, Liquidation expenses | Loans individually evaluated for credit loss | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	5.60%	5.60%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Level 3 | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	3.00%	3.00%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Level 3 | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	6.00%	6.00%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Level 3 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	5.00%	5.00%

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