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Reinsurance - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2017
Effects of Reinsurance [Line Items]      
Consideration payment     $ 7,200,000
Contingent recovery, percentage     35.00%
Reinsurance reinstatement cost $ 250,000    
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