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Fair Value of Financial Instruments - Rollforward of Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Financial Assets |  |  |  |
Beginning balance | $ 399,724 | $ 254,713 | $ 295,178 | $ 248,489
Transfers into Level 3 | 21,670 | 39,921 | 215,664 | 67,801
Transfers out of Level 3 | (100,169) | (3,271) | (166,659) | (8,147)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | (265) | 46 | (257) | 46
Net unrealized investment gains (losses) included in OCI | 10,022 | 2,983 | (10,440) | 9,955
Purchases | 0 | 0 | 8,765 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,240) | (3,193) | (14,509) | (27,904)
Ending balance | 327,742 | 291,199 | 327,742 | 291,199
Financial Liabilities |  |  |  |
Beginning balance | 93,619 | 85,961 | 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 investment (gains) losses included in net income related to financial liabilities | 4,406 | 3,661 | 5,330 | 8,366
Net unrealized investment gains (losses) included in OCI | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 1,951 | 2,033 | 5,818 | 7,482
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (1,906) | (2,557) | (6,811) | (5,450)
Ending balance | 98,070 | 89,098 | 98,070 | 89,098
Municipal bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 73,171 | 46,984 | 44,291 | 47,531
Transfers into Level 3 | 6,209 | 0 | 80,686 | 0
Transfers out of Level 3 | (16,708) | 0 | (62,625) | 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 | 3,150 | 842 | 3,962 | 649
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (151) | (121) | (643) | (475)
Ending balance | 65,671 | 47,705 | 65,671 | 47,705
Corporate bonds |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 126,292 | 79,222 | 103,952 | 80,742
Transfers into Level 3 | 6,798 | 18,916 | 39,601 | 24,798
Transfers out of Level 3 | (12,511) | (2,822) | (26,699) | (7,698)
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 | 551 | 1,744 | 378 | 6,254
Purchases | 0 | 0 | 6,875 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | 55 | (387) | (2,922) | (8,989)
Ending balance | 121,185 | 96,673 | 121,185 | 96,673
Mortgage-Backed Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 200,146 | 128,438 | 146,828 | 120,211
Transfers into Level 3 | 8,663 | 21,004 | 95,377 | 42,938
Transfers out of Level 3 | (70,950) | (449) | (77,335) | (449)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | (238) | 0 | (238) | 0
Net unrealized investment gains (losses) included in OCI | 6,321 | 397 | (14,780) | 3,052
Purchases | 0 | 0 | 1,890 | 0
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,144) | (2,685) | (10,944) | (18,440)
Ending balance | 140,798 | 146,705 | 140,798 | 146,705
Total Fixed Maturity Securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 399,609 | 254,644 | 295,071 | 248,484
Transfers into Level 3 | 21,670 | 39,920 | 215,664 | 67,736
Transfers out of Level 3 | (100,169) | (3,271) | (166,659) | (8,147)
Total gains or losses |  |  |  |
Net investment gains (losses) included in net income related to financial assets | (238) | 0 | (238) | 0
Net unrealized investment gains (losses) included in OCI | 10,022 | 2,983 | (10,440) | 9,955
Purchases | 0 | 0 | 8,765 | 1,566
Issuances | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | (607)
Settlements | 0 | 0 | 0 | 0
Paydowns, maturities and distributions | (3,240) | (3,193) | (14,509) | (27,904)
Ending balance | 327,654 | 291,083 | 327,654 | 291,083
Equity securities |  |  |  |
Financial Assets |  |  |  |
Beginning balance | 115 | 69 | 107 | 5
Transfers into Level 3 | 0 | 1 | 0 | 65
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 | (27) | 46 | (19) | 46
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 | $ 88 | $ 116 | $ 88 | $ 116

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