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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financial Assets |  |  |  |
Beginning balance | $ 248,757 | $ 200,391 | $ 212,104 | $ 173,426
Transfers into Level 3 | 11,483 | 18,001 | 61,654 | 50,453
Transfers out of Level 3 | (11,410) | 0 | (18,271) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (1,714) | (657) | (1,714) | (657)
Net unrealized investment gains (losses) included in other comprehensive income | 4,739 | 2,919 | 5,935 | 4,784
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,350) | (3,012) | (13,203) | (10,364)
Ending balance | 246,505 | 217,642 | 246,505 | 217,642
Financial Liabilities |  |  |  |
Beginning balance | 64,261 | 42,085 | 59,393 | 39,021
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net realized gains (losses) included in net income related to financial liabilities | 1,238 | 1,324 | 3,546 | 1,998
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 3,397 | 4,993 | 6,786 | 8,484
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (901) | (696) | (1,730) | (1,797)
Ending balance | 67,995 | 47,706 | 67,995 | 47,706
Short-term Investments |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 0 | 0 | 751 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (751) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | 0 | 0 | 0 | 0
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 53,462 | 46,493 | 46,497 | 30,379
Transfers into Level 3 | 0 | 0 | 5,214 | 14,751
Transfers out of Level 3 | (5,557) | 0 | (5,557) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 1,287 | 1,297 | 3,158 | 2,781
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (69) | (143) | (189) | (264)
Ending balance | 49,123 | 47,647 | 49,123 | 47,647
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 82,495 | 70,071 | 60,191 | 67,575
Transfers into Level 3 | 2,001 | 5,017 | 31,919 | 11,076
Transfers out of Level 3 | (5,853) | 0 | (11,963) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | (657) | 0 | (657)
Net unrealized investment gains (losses) included in other comprehensive income | 359 | 1,393 | 455 | 1,781
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (1,950) | (2,416) | (3,550) | (6,367)
Ending balance | 77,052 | 73,408 | 77,052 | 73,408
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 112,794 | 83,821 | 104,659 | 75,466
Transfers into Level 3 | 9,482 | 12,984 | 24,521 | 24,626
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (1,714) | 0 | (1,714) | 0
Net unrealized investment gains (losses) included in other comprehensive income | 3,093 | 229 | 2,322 | 222
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,331) | (453) | (9,464) | (3,733)
Ending balance | 120,324 | 96,581 | 120,324 | 96,581
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 248,751 | 200,385 | 211,347 | 173,420
Transfers into Level 3 | 11,483 | 18,001 | 61,654 | 50,453
Transfers out of Level 3 | (11,410) | 0 | (17,520) | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | (1,714) | (657) | (1,714) | (657)
Net unrealized investment gains (losses) included in other comprehensive income | 4,739 | 2,919 | 5,935 | 4,784
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,350) | (3,012) | (13,203) | (10,364)
Ending balance | 246,499 | 217,636 | 246,499 | 217,636
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 6 | 6 | 6 | 6
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | $ 6 | $ 6 | $ 6 | $ 6

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