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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Financial Assets |  |  |  |
Beginning balance | $ 357,195 | $ 266,033 | $ 295,178 | $ 248,489
Transfers into Level 3 | 88,935 | 2,872 | 193,994 | 27,880
Transfers out of Level 3 | (53,521) | (4,876) | (66,490) | (4,876)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 32 | 0 | 8 | 0
Net unrealized investment gains (losses) included in OCI | 12,407 | 4,231 | (20,462) | 6,972
Purchases | 0 | 1,566 | 8,765 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | (607) | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,324) | (14,506) | (11,269) | (24,711)
Ending balance | 399,724 | 254,713 | 399,724 | 254,713
Financial Liabilities |  |  |  |
Beginning balance | 87,506 | 84,629 | 93,733 | 78,700
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 | 5,966 | 371 | 924 | 4,705
Net unrealized investment gains (losses) included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 2,513 | 2,431 | 3,867 | 5,449
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (2,366) | (1,470) | (4,905) | (2,893)
Ending balance | 93,619 | 85,961 | 93,619 | 85,961
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 104,892 | 47,756 | 44,291 | 47,531
Transfers into Level 3 | 10,726 | 0 | 74,477 | 0
Transfers out of Level 3 | (45,917) | 0 | (45,917) | 0
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 3,838 | (537) | 812 | (193)
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (368) | (235) | (492) | (354)
Ending balance | 73,171 | 46,984 | 73,171 | 46,984
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 111,693 | 82,482 | 103,952 | 80,742
Transfers into Level 3 | 13,970 | 2,808 | 32,803 | 5,882
Transfers out of Level 3 | (4,166) | (4,876) | (14,188) | (4,876)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 5,308 | 1,961 | (173) | 4,510
Purchases | 0 | 1,566 | 6,875 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (513) | (4,719) | (2,977) | (8,602)
Ending balance | 126,292 | 79,222 | 126,292 | 79,222
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 140,527 | 135,790 | 146,828 | 120,211
Transfers into Level 3 | 64,239 | 0 | 86,714 | 21,934
Transfers out of Level 3 | (3,438) | 0 | (6,385) | 0
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 3,261 | 2,807 | (21,101) | 2,655
Purchases | 0 | 0 | 1,890 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | (607) | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (4,443) | (9,552) | (7,800) | (15,755)
Ending balance | 200,146 | 128,438 | 200,146 | 128,438
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 357,112 | 266,028 | 295,071 | 248,484
Transfers into Level 3 | 88,935 | 2,808 | 193,994 | 27,816
Transfers out of Level 3 | (53,521) | (4,876) | (66,490) | (4,876)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 0 | 0 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 12,407 | 4,231 | (20,462) | 6,972
Purchases | 0 | 1,566 | 8,765 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | (607) | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (5,324) | (14,506) | (11,269) | (24,711)
Ending balance | 399,609 | 254,644 | 399,609 | 254,644
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 83 | 5 | 107 | 5
Transfers into Level 3 | 0 | 64 | 0 | 64
Transfers out of Level 3 | 0 | 0 | 0 | 0
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | 32 | 0 | 8 | 0
Net unrealized investment gains (losses) included in OCI | 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 | $ 115 | $ 69 | $ 115 | $ 69

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