Commitments and Contingent Liabilities (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Line of Credit Facility [Line Items]
Commitments to extend credit	$ 166.8
Standby letters of credit	$ 3.2
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Standby letter of credit term, or less	2 years

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration