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Summary of significant accounting policies - Prior Period Adjustments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 23,218 | $ 25,444 | $ 27,472 | $ 29,374 | $ 28,407 | $ 28,383
Overstatement of allowance for credit losses |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Allowance for credit losses | 1,500 | $ 1,500 |  |  |  |
Overstatement of allowance for credit losses | Adoption of ASU 2016-13 |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
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 [Line Items] |  |  |  |  |  |
Allowance for credit losses | $ 400 |  |  |  |  |

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