Policyholder Liabilities - Summary of Future Life and Accident and Health Policy Benefits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	$ 72,337	$ 72,313
Traditional Life Contracts
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	61,972	62,311
Immediate Annuities and Pension Plan
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	6,608	6,774
Supplemental Contracts with Life Contingencies
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	3,118	2,522
Accident and Health
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	345	386
Accident Death Benefits
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	132	132
Disability
Liability For Future Policy Benefit By Product Segment [Line Items]
Total future life and accident and health policy benefits	$ 162	$ 188