Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Unadvanced lines of credit	$ 283.2	$ 265.2
Standby letters of credit outstanding	$ 1.4	$ 1.2

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant