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Fair Value Measurements (Schedule of Assets Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | $ 32,215 | $ 41,790
State And Municipal [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 10,894 | 11,206
Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 4,710 | 5,500
Government Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 16,611 | 25,084
Recurring Basis [Member] | Significant Other Observable Inputs Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 32,215 | 41,790
Recurring Basis [Member] | Significant Other Observable Inputs Level 2 [Member] | State And Municipal [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 10,894 | 11,206
Recurring Basis [Member] | Significant Other Observable Inputs Level 2 [Member] | Asset-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | 4,710 | 5,500
Recurring Basis [Member] | Significant Other Observable Inputs Level 2 [Member] | Government Mortgage-Backed Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in available-for-sale securities (at fair value) | $ 16,611 | $ 25,084

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