Deposits (Maturity Of Time Deposits Of $250,000 Or More) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Within three months	$ 2,841
Over three through six months	879
Over six through twelve months	405
Over twelve months	519
Total	$ 4,644	$ 6,200

Contractual Maturities Time Deposits 250000 Or More Three Months Through Six Months

No definition available.

Name:	fraf_ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsThroughSixMonths
Namespace Prefix:	fraf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant