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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Recurring
Assets
Trading Securities Debt	$ 33,106		$ 32,783
Recurring | CMO
Assets
Trading Securities Debt	595		655
Recurring | Other
Assets
Trading Securities Debt	118		133
Recurring | Level 3
Assets
Trading Securities Debt	202		217
Recurring | Level 3 | CMO
Assets
Trading Securities Debt	0		0
Recurring | Level 3 | Other
Assets
Trading Securities Debt	$ 118	$ 154	$ 133
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		$ 4,166
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Minimum
Unobservable inputs
Haircut applied on external appraisal		5.00%
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Maximum
Unobservable inputs
Haircut applied on external appraisal		10.00%
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Weighted Average
Unobservable inputs
Haircut applied on external appraisal		7.50%
Nonrecurring | Level 3 | Other real estate owned
Assets
Other real estate owned	$ 34	$ 16
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average
Unobservable inputs
Haircut applied on external appraisal	20.00%	35.00%

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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

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

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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.

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

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