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Investments - Revenue Bonds by Type (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 600,832 | $ 592,378
Fair Market Value | 620,154 | 600,799
Lease [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,945 | 1,949
Fair Market Value | 1,988 | 1,995
Electricity [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,419 | 1,421
Fair Market Value | 1,478 | 1,521
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 195,565 | 181,900
Fair Market Value | 203,166 | 188,265
Revenue Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 27,916 | 25,861
Fair Market Value | 28,829 | 26,678
Revenue Bonds [Member] | Water [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,499 | 7,515
Fair Market Value | 7,774 | 7,775
Revenue Bonds [Member] | College & University [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,993 | 1,997
Fair Market Value | 2,031 | 2,019
Revenue Bonds [Member] | Sales Tax [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,752 | 4,760
Fair Market Value | 4,854 | 4,811
Revenue Bonds [Member] | Sewer [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,639 | 3,596
Fair Market Value | 4,751 | 3,678
Revenue Bonds [Member] | Other Revenue Source [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,669 | 4,623
Fair Market Value | $ 5,953 | $ 4,879

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