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Income Taxes - Reconciliation Between Statutory Tax Rate to Income Before Income Taxes and Actual Provision for Income Taxes (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |
PRC income tax rate | 25.00% | 25.00% | 25.00%
Expenses not deductible for tax purposes | 0.04% | 0.38% | 0.14%
Effect of tax-free investment income | (1.37%) | (0.49%) | (2.03%)
Effect of different tax rate of subsidiary operation in other jurisdiction | (5.13%) | (2.54%) | (3.30%)
Effect of deferred tax asset allowance | 5.85% | 1.57% | 1.07%
Effect of tax holidays | (2.60%) | (1.00%) | (0.73%)
Effect of income from equity in Fund of Fund | 1.27% | 0.49% | 1.92%
Effect of true-ups | (0.47%) | (1.51%) | 0.84%
Effect of others | 0.14% | 0.10% | 0.01%
Effective Income Tax Rate Reconciliation, Percent, Total | 22.73% | 22.00% | 22.92%

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