Fair value measurement - Quantitative inputs level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Recurring
Assets
Trading Securities Debt	$ 32,783	$ 31,568
Recurring \| CMO
Assets
Trading Securities Debt	655	98
Recurring \| Other
Assets
Trading Securities Debt	133	167
Recurring \| Level 3
Assets
Trading Securities Debt	217	284
Recurring \| Level 3 \| CMO
Assets
Trading Securities Debt	0	$ 5
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach \| Minimum
Unobservable inputs
Weighted average life (in years)		1 month 6 days
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach \| Maximum
Unobservable inputs
Weighted average life (in years)		2 months 12 days
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach \| Weighted Average
Unobservable inputs
Weighted average life (in years)		2 months 12 days
Yield		4.90%
Prepayment speed		14.50%
Recurring \| Level 3 \| Other
Assets
Trading Securities Debt	$ 133	$ 167
Recurring \| Level 3 \| Other \| Trading account debt securities \| Discounted cash flow approach \| Weighted Average
Unobservable inputs
Weighted average life (in years)	2 years	2 years 3 months 18 days
Yield	12.00%	12.00%
Prepayment speed	10.80%	10.80%
Nonrecurring \| Level 3 \| Loans held in portfolio
Assets
Loans	$ 6,808	$ 10,023
Nonrecurring \| Level 3 \| Loans held in portfolio \| Valuation Technique External Appraisal \| Minimum
Unobservable inputs
Haircut applied on external appraisal	5.00%	5.00%
Nonrecurring \| Level 3 \| Loans held in portfolio \| Valuation Technique External Appraisal \| Maximum
Unobservable inputs
Haircut applied on external appraisal	10.00%	10.00%
Nonrecurring \| Level 3 \| Loans held in portfolio \| Valuation Technique External Appraisal \| Weighted Average
Unobservable inputs
Haircut applied on external appraisal	6.60%	6.90%
Nonrecurring \| Level 3 \| Other real estate owned
Assets
Other real estate owned	$ 53	$ 325
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Minimum
Unobservable inputs
Haircut applied on external appraisal	35.00%
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Maximum
Unobservable inputs
Haircut applied on external appraisal	65.60%
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Weighted Average
Unobservable inputs
Haircut applied on external appraisal	60.10%	35.00%

Certain internal adjustments made to external appraisals.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

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