Fair value measurement - Quantitative inputs level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Recurring
Assets
Trading Securities Debt	$ 31,568	$ 27,723
Recurring \| CMO
Assets
Trading Securities Debt	98	160
Recurring \| Other
Assets
Trading Securities Debt	167	207
Recurring \| Level 3
Assets
Trading Securities Debt	284	535
Recurring \| Level 3 \| CMO
Assets
Trading Securities Debt	$ 5	$ 113
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach
Unobservable inputs
Yield	4.90%
Weighted average prepayment speed (annual rate)	14.50%
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach \| Minimum
Unobservable inputs
Weighted average life (in years)	1 month 6 days	1 month 6 days
Yield		4.90%
Weighted average prepayment speed (annual rate)		9.10%
Recurring \| Level 3 \| CMO \| Trading account debt securities \| Discounted cash flow approach \| Maximum
Unobservable inputs
Weighted average life (in years)	2 months 12 days	7 months 6 days
Yield		5.40%
Weighted average prepayment speed (annual rate)		32.00%
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	4 months 24 days
Yield		4.90%
Weighted average prepayment speed (annual rate)		10.20%
Recurring \| Level 3 \| Other
Assets
Trading Securities Debt	$ 167	$ 207
Recurring \| Level 3 \| Other \| Trading account debt securities \| Discounted cash flow approach
Unobservable inputs
Weighted average life (in years)	2 years 3 months 18 days	2 years 6 months
Yield	12.00%	12.00%
Weighted average prepayment speed (annual rate)	10.80%	10.80%
Nonrecurring \| Level 3 \| Loans held in portfolio
Assets
Loans	$ 10,023	$ 5,087
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%	10.40%
Nonrecurring \| Level 3 \| Loans held in portfolio \| Valuation Technique External Appraisal \| Weighted Average
Unobservable inputs
Haircut applied on external appraisal	6.90%	8.30%
Nonrecurring \| Level 3 \| Other real estate owned
Assets
Other real estate owned	$ 325	$ 528
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal
Unobservable inputs
Haircut applied on external appraisal	35.00%
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Minimum
Unobservable inputs
Haircut applied on external appraisal		5.00%
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Maximum
Unobservable inputs
Haircut applied on external appraisal		35.00%
Nonrecurring \| Level 3 \| Other real estate owned \| Valuation Technique External Appraisal \| Weighted Average
Unobservable inputs
Haircut applied on external appraisal		18.40%

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 860
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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
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-Topic 210
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