Loan Servicing Rights - Analysis of the changes in MSRs (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Freddie Mac
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of year	$ 3,438	$ 2,980	$ 2,206
Additions	578	1,388	1,733
Amortization	(1,115)	(1,022)	(748)
Valuation recovery (allowance)	119	92	(211)
Balance, end of year	3,020	3,438	2,980
SBA
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of year	44	115	202
Other additions	0	0	13
Amortization	(41)	(89)	(90)
Valuation recovery (allowance)	0	18	(10)
Balance, end of year	$ 3	$ 44	$ 115

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122739-111746

Name:	us-gaap_AmortizationOfMortgageServicingRightsMSRs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration