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Investments - Maturity Table (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | $ 196,402 | $ 167,740
Mortgage-backed securities | 195,391 | $ 168,934
Maturity 2038 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 284 |
Mortgage-backed securities | 307 |
Maturity 2039 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 7,539 |
Mortgage-backed securities | 8,054 |
Maturity 2042 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 22,336 |
Mortgage-backed securities | 21,282 |
Maturity 2043 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 59,961 |
Mortgage-backed securities | 60,165 |
Maturity 2044 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 47,833 |
Mortgage-backed securities | 47,815 |
Maturity 2045 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments at cost | 58,449 |
Mortgage-backed securities | $ 57,768 |

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