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Investments - Maturity Table (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | $ 211,406 | $ 196,402
Mortgage-backed securities | 208,603 | $ 195,391
Maturity 2038 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 278 |
Mortgage-backed securities | 303 |
Maturity 2039 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 5,405 |
Mortgage-backed securities | 5,758 |
Maturity 2042 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 15,344 |
Mortgage-backed securities | 14,621 |
Maturity 2043 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 46,996 |
Mortgage-backed securities | 47,045 |
Maturity 2044 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 37,970 |
Mortgage-backed securities | 37,876 |
Maturity 2045 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 50,814 |
Mortgage-backed securities | 50,084 |
Maturity 2046 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 39,599 |
Mortgage-backed securities | 38,606 |
Maturity 2047 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments at fair value | 15,000 |
Mortgage-backed securities | $ 14,310 |

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