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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financial Assets |  |
Beginning balance | $ 295,178 | $ 248,489
Transfers into Level 3 | 268,804 | 90,306
Transfers out of Level 3 | (190,373) | (10,266)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (277) | (1,067)
Net unrealized investment gains (losses) included in OCI | (4,792) | 11,035
Purchases | 8,765 | 2,483
Issuances | 0 | 0
Sales | 1,214 | (608)
Settlements | 0 | 0
Paydowns, maturities and distributions | (23,453) | (45,194)
Ending balance | 355,066 | 295,178
Financial Liabilities |  |
Beginning balance | 93,733 | 78,700
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 liabilities | 11,499 | 12,636
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 8,373 | 10,039
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (9,117) | (7,642)
Ending balance | 104,488 | 93,733
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 44,291 | 47,531
Transfers into Level 3 | 80,686 | 0
Transfers out of Level 3 | (69,074) | 0
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 | 4,252 | 474
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (565) | (3,714)
Ending balance | 59,590 | 44,291
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 103,952 | 80,742
Transfers into Level 3 | 83,621 | 33,475
Transfers out of Level 3 | (36,620) | (7,698)
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 | 1,427 | 4,461
Purchases | 6,875 | 2,483
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (3,439) | (9,511)
Ending balance | 155,816 | 103,952
Other asset-backed securities |  |
Financial Assets |  |
Beginning balance | 146,828 | 120,211
Transfers into Level 3 | 104,263 | 56,766
Transfers out of Level 3 | (84,679) | (2,568)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (239) | (1,105)
Net unrealized investment gains (losses) included in OCI | (10,471) | 6,100
Purchases | 1,890 | 0
Issuances | 0 | 0
Sales | 1,214 | (607)
Settlements | 0 | 0
Paydowns, maturities and distributions | (19,449) | (31,969)
Ending balance | 139,357 | 146,828
Total |  |
Financial Assets |  |
Beginning balance | 295,071 | 248,484
Transfers into Level 3 | 268,570 | 90,241
Transfers out of Level 3 | (190,373) | (10,266)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (239) | (1,105)
Net unrealized investment gains (losses) included in OCI | (4,792) | 11,035
Purchases | 8,765 | 2,483
Issuances | 0 | 0
Sales | 1,214 | (607)
Settlements | 0 | 0
Paydowns, maturities and distributions | (23,453) | (45,194)
Ending balance | 354,763 | 295,071
Equity securities |  |
Financial Assets |  |
Beginning balance | 107 | 5
Transfers into Level 3 | 234 | 65
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (38) | 38
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | (1)
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | $ 303 | $ 107

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