Reinsurance - Narrative (Details) - USD ($)	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Maximum
Effects of Reinsurance [Line Items]
Amount retained (excess of)	$ 500,000	$ 500,000

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