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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
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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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