Fair Value of Assets and Liabilities (Textuals) (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Fair Value Transfers Between Levels Amount	$ 0	$ 0

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