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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financial Assets |  |
Beginning balance | $ 230,257 | $ 212,104
Transfers into Level 3 | 91,259 | 86,788
Transfers out of Level 3 | (16,479) | (29,102)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (484) | (1,833)
Net unrealized investment gains (losses) included in OCI | (9,605) | 6,713
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (6,326) | (11,178)
Settlements | 0 | 0
Paydowns, maturities and distributions | (40,133) | (33,235)
Ending balance | 248,489 | 230,257
Financial Liabilities |  |
Beginning balance | 80,733 | 59,393
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net realized (gains) losses included in net income related to financial liabilities | (7,518) | 12,942
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 11,183 | 12,605
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (5,698) | (4,207)
Ending balance | 78,700 | 80,733
Short-term Investments |  |
Financial Assets |  |
Beginning balance | 0 | 751
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (751)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | 0 | 0
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 49,328 | 46,497
Transfers into Level 3 | 0 | 5,214
Transfers out of Level 3 | 0 | (5,557)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0
Net unrealized investment gains (losses) included in OCI | (1,195) | 3,977
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (602) | (803)
Ending balance | 47,531 | 49,328
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 72,979 | 60,191
Transfers into Level 3 | 40,488 | 38,483
Transfers out of Level 3 | (11,279) | (16,252)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (487) | (1)
Net unrealized investment gains (losses) included in OCI | (2,840) | 661
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (6,135) | (1,999)
Settlements | 0 | 0
Paydowns, maturities and distributions | (11,984) | (8,104)
Ending balance | 80,742 | 72,979
Other mortgage-backed securities |  |
Financial Assets |  |
Beginning balance | 107,944 | 104,659
Transfers into Level 3 | 50,771 | 43,091
Transfers out of Level 3 | (5,200) | (6,542)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0 | (1,832)
Net unrealized investment gains (losses) included in OCI | (5,570) | 2,075
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (187) | (9,179)
Settlements | 0 | 0
Paydowns, maturities and distributions | (27,547) | (24,328)
Ending balance | 120,211 | 107,944
Total |  |
Financial Assets |  |
Beginning balance | 230,251 | 211,347
Transfers into Level 3 | 91,259 | 86,788
Transfers out of Level 3 | (16,479) | (28,351)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (487) | (1,833)
Net unrealized investment gains (losses) included in OCI | (9,605) | 6,713
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (6,322) | (11,178)
Settlements | 0 | 0
Paydowns, maturities and distributions | (40,133) | (33,235)
Ending balance | 248,484 | 230,251
Equity securities |  |
Financial Assets |  |
Beginning balance | 6 | 6
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 3 | 0
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (4) | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | $ 5 | $ 6

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