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Investments - Revenue and General Obligation Bonds by Location (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
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
General Obligation Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 167,649 | 156,039
Fair Market Value | 174,337 | 161,587
General Obligation Bonds [Member] | Texas [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 65,619 | 59,439
Fair Market Value | 68,182 | 61,519
General Obligation Bonds [Member] | California [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,445 | 23,392
Fair Market Value | 24,579 | 24,313
General Obligation Bonds [Member] | Washington [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,873 | 23,882
Fair Market Value | 24,996 | 25,030
General Obligation Bonds [Member] | Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,712 | 49,326
Fair Market Value | 56,580 | 50,725
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] | Texas [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,068 | 6,035
Fair Market Value | 7,320 | 6,298
Revenue Bonds [Member] | Utah [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,787 | 1,737
Fair Market Value | 2,927 | 1,856
Revenue Bonds [Member] | Indiana [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 364 | 365
Fair Market Value | 379 | 380
Revenue Bonds [Member] | Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 17,697 | 17,724
Fair Market Value | $ 18,203 | $ 18,144

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