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Employee Benefit Plans (Detail Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 1988
Dec. 31, 1987
Dec. 31, 1985
Compensation and Retirement Disclosure [Abstract]          
Amount borrowed         $ 2,000,000us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanAmount
Employee stock ownership plan, interest rate, description prime rate        
Employee stock ownership plan, term of loan 40 years        
Employee stock ownership plan, amount of additional loan     1,942,000svt_EmployeeStockOwnershipPlanDebtStructureAdditionalDirectLoanAmount 1,942,000svt_EmployeeStockOwnershipPlanDebtStructureAdditionalDirectLoanAmount  
ESOP, number of allocated shares since inception         429,966us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
ESOP, number of unallocated shares 176,853us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares 195,793us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares      
ESOP, compensation expenses $ 101,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 100,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense