Reinsurance - Narrative (Details) - Subsequent Event	1 Months Ended
Jan. 31, 2019 agreement
Effects of Reinsurance [Line Items]
Number of reinsurance contracts entered into	2
Four years reinsurance agreement with unrelated insurer	4 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_EffectsOfReinsuranceLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration