Fair Value Accounting and Measurement (Aggregate FV and aggregate unpaid principal balance of LHFS under FV option (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
FV, Loans held for sale, FV option, Mandatory Delivery method	$ 10,847	$ 14,760
Fair Value, Loans held for sale, FV option, Aggregate Unpaid Principal Balance	10,645	14,252
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	$ 202	$ 508

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

Name:	us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant