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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financial Assets |  |  |  |
Beginning balance | $ 266,033 | $ 243,868 | $ 248,489 | $ 230,257
Transfers into Level 3 | 2,872 | 48,031 | 27,880 | 73,631
Transfers out of Level 3 | (4,876) | (15,509) | (4,876) | (15,509)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | (246) | 0 | (243)
Net unrealized investment gains (losses) included in other comprehensive income | 4,231 | 1,356 | 6,972 | (110)
Purchases | 1,566 | 0 | 1,566 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (607) | 0 | (607) | (3)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (14,506) | (5,849) | (24,711) | (16,372)
Ending balance | 254,713 | 271,651 | 254,713 | 271,651
Financial Liabilities |  |  |  |
Beginning balance | 84,629 | 78,486 | 78,700 | 80,733
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 | 371 | (1,291) | 4,705 | (3,513)
Net unrealized investment gains (losses) included in other comprehensive income | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 2,431 | 2,107 | 5,449 | 3,439
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (1,470) | (1,514) | (2,893) | (2,871)
Ending balance | 85,961 | 77,788 | 85,961 | 77,788
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 266,028 | 243,862 | 248,484 | 230,251
Transfers into Level 3 | 2,808 | 48,031 | 27,816 | 73,631
Transfers out of Level 3 | (4,876) | (15,509) | (4,876) | (15,509)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | (246) | 0 | (246)
Net unrealized investment gains (losses) included in other comprehensive income | 4,231 | 1,356 | 6,972 | (110)
Purchases | 1,566 | 0 | 1,566 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (607) | 0 | (607) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (14,506) | (5,849) | (24,711) | (16,372)
Ending balance | 254,644 | 271,645 | 254,644 | 271,645
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 47,756 | 49,748 | 47,531 | 49,328
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 | (537) | 397 | (193) | 840
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (235) | (224) | (354) | (247)
Ending balance | 46,984 | 49,921 | 46,984 | 49,921
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 82,482 | 78,780 | 80,742 | 72,979
Transfers into Level 3 | 2,808 | 29,709 | 5,882 | 40,487
Transfers out of Level 3 | (4,876) | (11,279) | (4,876) | (11,279)
Total gains or losses |  |  |  |
Net realized investment gains (losses) included in net income related to financial assets | 0 | (246) | 0 | (246)
Net unrealized investment gains (losses) included in other comprehensive income | 1,961 | (700) | 4,510 | (1,587)
Purchases | 1,566 | 0 | 1,566 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (4,719) | (3,601) | (8,602) | (7,691)
Ending balance | 79,222 | 92,663 | 79,222 | 92,663
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 135,790 | 115,334 | 120,211 | 107,944
Transfers into Level 3 | 0 | 18,322 | 21,934 | 33,144
Transfers out of Level 3 | 0 | (4,230) | 0 | (4,230)
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 | 2,807 | 1,659 | 2,655 | 637
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | (607) | 0 | (607) | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (9,552) | (2,024) | (15,755) | (8,434)
Ending balance | 128,438 | 129,061 | 128,438 | 129,061
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 5 | 6 | 5 | 6
Transfers into Level 3 | 64 | 0 | 64 | 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 | 3
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 | (3)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 0 | 0 | 0 | 0
Ending balance | $ 69 | $ 6 | $ 69 | $ 6

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