Benefit Plans - Employee Stock Ownership Plan (Details)	12 Months Ended
Dec. 31, 2017 item shares
Employee Stock Ownership Plan
Minimum number of hours of service required for plan eligibility \| item	1,000
Number of shares of Company's common stock owned by ESOP \| shares	115,838

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant