Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Total debt securities	$ 111,847	$ 149,783
Equity Securities	947	9,437
Short-term investments	30,562	23,013
Total marketable investments measured at fair value	143,356	182,233
Total assets measured at fair value	143,721	182,727
Liabilities:
Total Liabilities measured at fair value	48,799	35,822
U.S. Government
Assets:
Total debt securities	7,463	20,720
State and local government
Assets:
Total debt securities	21,145	30,429
Corporate debt
Assets:
Total debt securities	30,146	30,346
Asset-backed securities
Assets:
Total debt securities	21,723	28,438
Mortgage-backed securities
Assets:
Total debt securities	24,330	32,521
Commercial mortgage-backed securities
Assets:
Total debt securities	3,237	1,690
Collateralized mortgage obligations
Assets:
Total debt securities	3,803	5,639
Senior Unsecured Notes
Liabilities:
Debt	23,113	24,118
Subordinated notes
Liabilities:
Debt	11,186	11,704
Partnership interest
Assets:
Investments measured at NAV	365	494
FHLB of Indianapolis
Liabilities:
Debt	14,500
Level 1
Assets:
Total debt securities	0	0
Equity Securities	190	9,154
Short-term investments	30,562	23,013
Total marketable investments measured at fair value	30,752	32,167
Liabilities:
Total Liabilities measured at fair value	0	0
Level 1 | U.S. Government
Assets:
Total debt securities	0	0
Level 1 | State and local government
Assets:
Total debt securities	0	0
Level 1 | Corporate debt
Assets:
Total debt securities	0	0
Level 1 | Asset-backed securities
Assets:
Total debt securities	0	0
Level 1 | Mortgage-backed securities
Assets:
Total debt securities	0	0
Level 1 | Commercial mortgage-backed securities
Assets:
Total debt securities	0	0
Level 1 | Collateralized mortgage obligations
Assets:
Total debt securities	0	0
Level 1 | Senior Unsecured Notes
Liabilities:
Debt	0	0
Level 1 | Subordinated notes
Liabilities:
Debt	0	0
Level 1 | FHLB of Indianapolis
Liabilities:
Debt	0
Level 2
Assets:
Total debt securities	111,847	149,783
Equity Securities	757	283
Short-term investments	0	0
Total marketable investments measured at fair value	112,604	150,066
Liabilities:
Total Liabilities measured at fair value	37,613	24,118
Level 2 | U.S. Government
Assets:
Total debt securities	7,463	20,720
Level 2 | State and local government
Assets:
Total debt securities	21,145	30,429
Level 2 | Corporate debt
Assets:
Total debt securities	30,146	30,346
Level 2 | Asset-backed securities
Assets:
Total debt securities	21,723	28,438
Level 2 | Mortgage-backed securities
Assets:
Total debt securities	24,330	32,521
Level 2 | Commercial mortgage-backed securities
Assets:
Total debt securities	3,237	1,690
Level 2 | Collateralized mortgage obligations
Assets:
Total debt securities	3,803	5,639
Level 2 | Senior Unsecured Notes
Liabilities:
Debt	23,113	24,118
Level 2 | Subordinated notes
Liabilities:
Debt	0	0
Level 2 | FHLB of Indianapolis
Liabilities:
Debt	14,500
Level 3
Assets:
Total debt securities	0	0
Equity Securities	0	0
Short-term investments	0	0
Total marketable investments measured at fair value	0	0
Liabilities:
Total Liabilities measured at fair value	11,186	11,704
Level 3 | U.S. Government
Assets:
Total debt securities	0	0
Level 3 | State and local government
Assets:
Total debt securities	0	0
Level 3 | Corporate debt
Assets:
Total debt securities	0	0
Level 3 | Asset-backed securities
Assets:
Total debt securities	0	0
Level 3 | Mortgage-backed securities
Assets:
Total debt securities	0	0
Level 3 | Commercial mortgage-backed securities
Assets:
Total debt securities	0	0
Level 3 | Collateralized mortgage obligations
Assets:
Total debt securities	0	0
Level 3 | Senior Unsecured Notes
Liabilities:
Debt	0	0
Level 3 | Subordinated notes
Liabilities:
Debt	11,186	$ 11,704
Level 3 | FHLB of Indianapolis
Liabilities:
Debt	$ 0