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Subsequent events (Details) ¥ / shares in Units, ¥ in Thousands, $ in Thousands | Dec. 31, 2022 CNY (¥) ¥ / shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Undistributed earning | ¥ 5,604,954 | $ 812,642 | ¥ 5,187,323
Board of Directors Chairman |  |  |
Subsequent Event [Line Items] |  |  |
Undistributed earning | ¥ | ¥ 176,500 |  |
Final dividend payable | ¥ / shares | ¥ 5.5 |  |

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