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Summary of significant accounting policies - Prior Period Adjustments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Error Corrections and Prior Period Adjustments Restatement
Allowance for credit losses	$ 23,010	$ 23,218		$ 27,472	$ 29,822	$ 29,374	$ 28,383
Overstatement of allowance for credit losses
Error Corrections and Prior Period Adjustments Restatement
Allowance for credit losses	$ 1,100		$ 1,500
Overstatement of allowance for credit losses | Adoption of ASU 2016-13
Error Corrections and Prior Period Adjustments Restatement
Allowance for credit losses		$ 1,100
Overstatement of allowance for credit losses | Reduction in the first quarter provision requirement
Error Corrections and Prior Period Adjustments Restatement
Allowance for credit losses			$ 400

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482635/260-10-55-15

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-12

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-9

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-11

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147483443/250-10-50-11

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-7

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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