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Organization and Basis of Presentation - Summary of Financial Securities (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Equity securities: |  |  |
Gross Unrealized Gain (Loss) | $ 2,215,000 | $ 4,280,000 |
Carrying Value | 2,700,000 |  | $ 3,600,000
Held to maturity |  |  |
Equity and Debt Securities, Amortized Cost | 129,390,000 |  | 140,649,000
Equity and Debt Securities, Gross Unrealized Gain (Loss) | 5,581,000 |  | 3,544,000
Equity and Debt Securities, Marketable Securities | 134,971,000 |  | 144,193,000
Equity and Debt Securities, Allowance for Credit Loss | 13,644,000 |  | 0
Investment funds - debt securities |  |  |
Equity securities: |  |  |
Amortized Cost/Cost | 31,127,000 |  | 29,588,000
Gross Unrealized Gain (Loss) | 1,135,000 |  | 544,000
Carrying Value | 32,262,000 |  | 30,132,000
Common stock and stock funds |  |  |
Equity securities: |  |  |
Amortized Cost/Cost | 67,636,000 |  | 34,941,000
Gross Unrealized Gain (Loss) | 4,551,000 |  | 2,927,000
Carrying Value | 72,187,000 |  | 37,868,000
U.S. treasury securities |  |  |
Available for sale |  |  |
Amortized Cost/Cost |  |  | 2,421,000
Gross Unrealized Gain (Loss) |  |  | 13,000
Carrying Value |  |  | 2,434,000
Investment-grade unsecured debt |  |  |
Available for sale |  |  |
Amortized Cost/Cost | 1,049,000 |  | 1,048,000
Gross Unrealized Gain (Loss) | (105,000) |  | 60,000
Carrying Value | 944,000 |  | 1,108,000
Allowance for Credit Losses | 0 |  |
Mortgage backed security |  |  |
Held to maturity |  |  |
Amortized Cost/Cost | 29,578,000 |  | 72,651,000
Gross Unrealized Gain (Loss) | 0 |  | 0
Carrying Value | 29,578,000 |  | $ 72,651,000
Allowance for Credit Losses | $ 13,644,000 |  |

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