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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - Level 3 - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Loans individually evaluated for credit loss |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured at fair value | $ 7,712 | $ 8,871
Other Real Estate Owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets measured at fair value | $ 1,682 | $ 1,682
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 0.00% | 0.00%
Measurement Input, Appraisal Adjustment | Loans individually evaluated for credit loss | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 234.00% | 100.00%
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 | 75.40% | 52.40%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | Minimum |  |
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 | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 25.00% | 25.00%
Measurement Input, Appraisal Adjustment | Other Real Estate Owned | Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 16.90% | 16.90%
Measurement Input, Liquidation expenses | Loans individually evaluated for credit loss | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of liquidation expenses | 0.00% | 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 | 0.00% | 12.20%
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 | 0.00% | 0.26%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of liquidation expenses | 0.00% | 0.00%
Measurement Input, Liquidation expenses | Other Real Estate Owned | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of liquidation expenses | 0.00% | 0.00%
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% | 0.00%

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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