Investments - Available-for-sale Securities in Unrealized Loss Positions (Details) $ in Thousands | Mar. 31, 2021USD ($)security | Dec. 31, 2020USD ($)security |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 120 | 32 |
Debt securities, greater than 12 months, number of issues | security | 9 | 11 |
Debt securities, number of issues | security | 129 | 43 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 81,578 | $ 20,516 |
Debt securities, greater than 12 months, fair value | 5,547 | 6,551 |
Debt securities, fair value | 87,125 | 27,067 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (2,047) | (112) |
Debt securities, greater than 12 months, unrealized losses | (37) | (39) |
Debt securities, total unrealized losses | $ (2,084) | $ (151) |
U.S. Government | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 5 | 2 |
Debt securities, greater than 12 months, number of issues | security | 0 | 0 |
Debt securities, number of issues | security | 5 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 7,664 | $ 6,764 |
Debt securities, greater than 12 months, fair value | 0 | 0 |
Debt securities, fair value | 7,664 | 6,764 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (27) | (1) |
Debt securities, greater than 12 months, unrealized losses | 0 | 0 |
Debt securities, total unrealized losses | $ (27) | $ (1) |
State and local government | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 70 | 16 |
Debt securities, greater than 12 months, number of issues | security | 0 | 0 |
Debt securities, number of issues | security | 70 | 16 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 14,758 | $ 3,905 |
Debt securities, greater than 12 months, fair value | 0 | 0 |
Debt securities, fair value | 14,758 | 3,905 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (601) | (28) |
Debt securities, greater than 12 months, unrealized losses | 0 | 0 |
Debt securities, total unrealized losses | $ (601) | $ (28) |
Corporate debt | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 13 | 2 |
Debt securities, greater than 12 months, number of issues | security | 0 | 0 |
Debt securities, number of issues | security | 13 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 9,144 | $ 1,051 |
Debt securities, greater than 12 months, fair value | 0 | 0 |
Debt securities, fair value | 9,144 | 1,051 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (410) | (23) |
Debt securities, greater than 12 months, unrealized losses | 0 | 0 |
Debt securities, total unrealized losses | $ (410) | $ (23) |
Asset-backed securities | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 14 | 7 |
Debt securities, greater than 12 months, number of issues | security | 7 | 11 |
Debt securities, number of issues | security | 21 | 18 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 17,644 | $ 6,050 |
Debt securities, greater than 12 months, fair value | 4,578 | 6,551 |
Debt securities, fair value | 22,222 | 12,601 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (114) | (34) |
Debt securities, greater than 12 months, unrealized losses | (4) | (39) |
Debt securities, total unrealized losses | $ (118) | $ (73) |
Mortgage-backed securities | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 9 | 2 |
Debt securities, greater than 12 months, number of issues | security | 0 | 0 |
Debt securities, number of issues | security | 9 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 28,941 | $ 1,652 |
Debt securities, greater than 12 months, fair value | 0 | 0 |
Debt securities, fair value | 28,941 | 1,652 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (861) | (3) |
Debt securities, greater than 12 months, unrealized losses | 0 | 0 |
Debt securities, total unrealized losses | $ (861) | $ (3) |
Commercial mortgage-backed securities | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 0 | 1 |
Debt securities, greater than 12 months, number of issues | security | 1 | 0 |
Debt securities, number of issues | security | 1 | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 0 | $ 899 |
Debt securities, greater than 12 months, fair value | 888 | 0 |
Debt securities, fair value | 888 | 899 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | 0 | (22) |
Debt securities, greater than 12 months, unrealized losses | (32) | 0 |
Debt securities, total unrealized losses | $ (32) | $ (22) |
Collateralized mortgage obligations | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] | | |
Debt securities, less than 12 months, number of issues | security | 9 | 2 |
Debt securities, greater than 12 months, number of issues | security | 1 | 0 |
Debt securities, number of issues | security | 10 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] | | |
Debt securities, less than 12 months, fair value | $ 3,427 | $ 195 |
Debt securities, greater than 12 months, fair value | 81 | 0 |
Debt securities, fair value | 3,508 | 195 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] | | |
Debt securities, less than 12 months, unrealized losses | (34) | (1) |
Debt securities, greater than 12 months, unrealized losses | (1) | 0 |
Debt securities, total unrealized losses | $ (35) | $ (1) |