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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - Level 3 - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans individually evaluated for credit loss
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 14,236	$ 22,164
Other Real Estate Owned
Fair Value Inputs, Assets, Quantitative Information
Assets measured at fair value	$ 2,685	$ 738
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	5.00%	3.00%
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	94.00%	111.90%
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	57.50%	59.60%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | 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 | 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 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	2.90%	9.70%
Measurement Input, Liquidation expenses | Loans individually evaluated for credit loss | 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 | 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 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	5.50%	5.60%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	0.00%	3.00%
Measurement Input, Liquidation expenses | Other Real Estate Owned | 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 | Weighted Average
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of liquidation expenses	0.00%	5.00%

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- Definition

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- Definition

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

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