Related Party Transactions (Details)	12 Months Ended
Dec. 31, 2012 item
Related Party Transactions
Number of loans in which the entity participated as lender	2

Represents the number of loans advanced to related party.

No definition available.

Name:	saft_RelatedPartyTransactionNumberOfLoans
Namespace Prefix:	saft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration