Business Combinations - Schedule of Fair Value of Net Assets Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019
Liabilities
Goodwill	$ 13,900	$ 13,900
Ozark National Life Insurance Company And NIS
Assets
Debt securities held to maturity			$ 261,059
Debt securities available for sale			400,719
Policy loans			28,128
Real estate			4,600
Cash and cash equivalents			16,275
Accrued investment income			6,116
Value of business acquired			145,768
Reinsurance recoverables			21,895
Other intangible assets			9,600
Other assets acquired			12,075
Total assets acquired			906,235
Liabilities
Traditional life reserves			691,297
Other policyholder liabilities			13,867
Other liabilities acquired			5,840
Total liabilities acquired			711,004
Net identifiable assets acquired			195,231
Goodwill	$ 13,864	$ 13,864	13,864
Net assets acquired			$ 209,095