Reinsurance - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Effects of Reinsurance [Line Items]
Reinsurance reinstatement costs	$ 93,000	$ 343,000
Property Risk | Maximum
Effects of Reinsurance [Line Items]
Amount retained (excess of)		300,000	$ 300,000
Liability Risk | Maximum
Effects of Reinsurance [Line Items]
Amount retained (excess of)		$ 400,000	$ 500,000