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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Financial Assets |  |
Beginning balance | $ 248,489 | $ 230,257
Transfers into Level 3 | 90,306 | 91,259
Transfers out of Level 3 | (10,266) | (16,479)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (1,067) | (484)
Net unrealized investment gains (losses) included in OCI | 11,035 | (9,605)
Purchases | 2,483 | 0
Issuances | 0 | 0
Sales | (608) | (6,326)
Settlements | 0 | 0
Paydowns, maturities and distributions | (45,194) | (40,133)
Ending balance | 295,178 | 248,489
Financial Liabilities |  |
Beginning balance | 78,700 | 80,733
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 | 12,636 | (7,518)
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 10,039 | 11,183
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (7,642) | (5,698)
Ending balance | 93,733 | 78,700
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 47,531 | 49,328
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 | 0 | 0
Net unrealized investment gains (losses) included in OCI | 474 | (1,195)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | 0 | 0
Settlements | 0 | 0
Paydowns, maturities and distributions | (3,714) | (602)
Ending balance | 44,291 | 47,531
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 80,742 | 72,979
Transfers into Level 3 | 33,475 | 40,488
Transfers out of Level 3 | (7,698) | (11,279)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0 | (487)
Net unrealized investment gains (losses) included in OCI | 4,461 | (2,840)
Purchases | 2,483 | 0
Issuances | 0 | 0
Sales | 0 | (6,135)
Settlements | 0 | 0
Paydowns, maturities and distributions | (9,511) | (11,984)
Ending balance | 103,952 | 80,742
Other mortgage-backed securities |  |
Financial Assets |  |
Beginning balance | 120,211 | 107,944
Transfers into Level 3 | 56,766 | 50,771
Transfers out of Level 3 | (2,568) | (5,200)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (1,105) | 0
Net unrealized investment gains (losses) included in OCI | 6,100 | (5,570)
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (607) | (187)
Settlements | 0 | 0
Paydowns, maturities and distributions | (31,969) | (27,547)
Ending balance | 146,828 | 120,211
Total |  |
Financial Assets |  |
Beginning balance | 248,484 | 230,251
Transfers into Level 3 | 90,241 | 91,259
Transfers out of Level 3 | (10,266) | (16,479)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (1,105) | (487)
Net unrealized investment gains (losses) included in OCI | 11,035 | (9,605)
Purchases | 2,483 | 0
Issuances | 0 | 0
Sales | (607) | (6,322)
Settlements | 0 | 0
Paydowns, maturities and distributions | (45,194) | (40,133)
Ending balance | 295,071 | 248,484
Equity securities |  |
Financial Assets |  |
Beginning balance | 5 | 6
Transfers into Level 3 | 65 | 0
Transfers out of Level 3 | 0 | 0
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 38 | 3
Net unrealized investment gains (losses) included in OCI | 0 | 0
Purchases | 0 | 0
Issuances | 0 | 0
Sales | (1) | (4)
Settlements | 0 | 0
Paydowns, maturities and distributions | 0 | 0
Ending balance | $ 107 | $ 5

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