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Summary of Principal Accounting Policies - Schedule of Disaggregation of Revenue (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | ¥ 3,413,176 | $ 490,272 | ¥ 3,310,062 | ¥ 2,846,006
One-time commissions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 931,668 |  | 1,027,993 |
Recurring service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,845,465 |  | 1,776,549 |
Performance-based income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 113,085 |  | 143,634 |
Other service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 522,958 |  | 361,886 |
Lending services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 376,637 |  | 209,804 |
Investor education services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,353 |  | 36,555 |
Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 119,968 |  | 115,527 |
Wealth Management Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,329,853 |  | 2,318,212 | 2,141,395
Wealth Management Business | One-time commissions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 928,061 |  | 1,024,323 |
Wealth Management Business | Recurring service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,155,450 |  | 1,136,010 |
Wealth Management Business | Performance-based income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 23,430 |  | 44,309 |
Wealth Management Business | Other service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 222,912 |  | 113,570 |
Wealth Management Business | Lending services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 91,164 |  |  |
Wealth Management Business | Investor education services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,353 |  | 36,555 |
Wealth Management Business | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 105,395 |  | 77,015 |
Asset Management Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 787,551 |  | 751,759 | 590,640
Asset Management Business | One-time commissions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 3,607 |  | 3,670 |
Asset Management Business | Recurring service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 690,015 |  | 640,539 |
Asset Management Business | Performance-based income |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 89,655 |  | 99,325 |
Asset Management Business | Other service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,274 |  | 8,225 |
Asset Management Business | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 4,274 |  | 8,225 |
Lending and Other Businesses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 295,772 |  | 240,091 | ¥ 113,971
Lending and Other Businesses | Other service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 295,772 |  |  |
Lending and Other Businesses | Lending services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 285,473 |  |  |
Lending and Other Businesses | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | ¥ 10,299 |  |  |
Other Financial Service Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 240,091 |
Other Financial Service Business | Other service fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 240,091 |
Other Financial Service Business | Lending services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 209,804 |
Other Financial Service Business | Other services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | ¥ 30,287 |

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