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Investment Securities and Certificates of Deposit (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | The Company's Investment Securities and Certificates of Deposit as of December 31, 2020 and 2019 were as follows:
| December 31, 2020 |  | December 31, 2019
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt Securities | $ | 402,824 |  |  | $ | 39 |  |  | $ | — |  |  | $ | 402,863 |  |  | $ | 114,204 |  |  | $ | 591 |  |  | $ | 11 |  |  | $ | 114,784 |
Equity Securities | 666 |  |  | — |  |  | 73 |  |  | 593 |  |  | 666 |  |  | — |  |  | 168 |  |  | 498 |
Debt Securities Carried by Broker-Dealers | 550,002 |  |  | 27 |  |  | 3 |  |  | 550,026 |  |  | 225,727 |  |  | 1,648 |  |  | 20 |  |  | 227,355 |
Investment Funds | 87,612 |  |  | 19,742 |  |  | — |  |  | 107,354 |  |  | 58,704 |  |  | 7,809 |  |  | — |  |  | 66,513 |
Total Investment Securities (carried at fair value) | $ | 1,041,104 |  |  | $ | 19,808 |  |  | $ | 76 |  |  | $ | 1,060,836 |  |  | $ | 399,301 |  |  | $ | 10,048 |  |  | $ | 199 |  |  | $ | 409,150 |
Certificates of Deposit (carried at contract value) |  | — |  |  |  |  |  |  |  |  | 214,796 |
Total Investment Securities and Certificates of Deposit |  | $ | 1,060,836 |  |  |  |  |  |  |  |  | $ | 623,946 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company's available-for-sale debt securities as of December 31, 2020 and 2019 were as follows:
| December 31, 2020 |  | December 31, 2019
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 402,824 |  |  | $ | 402,863 |  |  | $ | 108,662 |  |  | $ | 109,217 |
Due after one year through five years | — |  |  | — |  |  | 5,542 |  |  | 5,567 |
Total | $ | 402,824 |  |  | $ | 402,863 |  |  | $ | 114,204 |  |  | $ | 114,784 |

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