Cash Flow Presentation (Details)	3 Months Ended
Mar. 31, 2015
Cash Flow Presentation [Abstract]
Period when federal funds are sold	1 day

Represents the period in which federal funds are sold.

No definition available.

Name:	svbi_PeriodInWhichFederalFundsAreSold
Namespace Prefix:	svbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration