Allowance for Loan Losses, Allowance for Loan Losses and Recorded Investment by Portfolio Segment Based on Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	$ 0	$ 0
Collectively evaluated for impairment	8,552	7,869
Purchased-credit impaired	0	0
Total allowance for loan losses	8,552	7,869	$ 7,143
Loans [Abstract]
Individually evaluated for impairment	8,673	3,231
Collectively evaluated for impairment	1,228,211	721,788
Purchased-credit impaired	10,241	0
Total loans	1,247,125	725,019
Residential Real Estate [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,155	5,103
Purchased-credit impaired	0	0
Total allowance for loan losses	4,155	5,103	4,647
Loans [Abstract]
Individually evaluated for impairment	7,198	2,221
Collectively evaluated for impairment	436,942	451,539
Purchased-credit impaired	0
Total loans	444,140	453,760
Multi-Family [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,433	1,506
Purchased-credit impaired	0	0
Total allowance for loan losses	2,433	1,506	1,215
Loans [Abstract]
Individually evaluated for impairment	458	47
Collectively evaluated for impairment	266,256	136,690
Purchased-credit impaired	0
Total loans	266,714	136,737
Commercial Real Estate [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,884	1,221
Purchased-credit impaired	0	0
Total allowance for loan losses	1,884	1,221	1,193
Loans [Abstract]
Individually evaluated for impairment	517	629
Collectively evaluated for impairment	339,966	113,129
Purchased-credit impaired	8,324
Total loans	348,807	113,758
Commercial and Industrial [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	79	38
Purchased-credit impaired	0	0
Total allowance for loan losses	79	38	75
Loans [Abstract]
Individually evaluated for impairment	500	334
Collectively evaluated for impairment	169,660	20,404
Purchased-credit impaired	1,917	0
Total loans	172,077	20,738
Construction [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Purchased-credit impaired	0	0
Total allowance for loan losses	0	0	0
Loans [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	15,374	0
Purchased-credit impaired	0	0
Total loans	15,374	0
Consumer [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1	1
Purchased-credit impaired	0	0
Total allowance for loan losses	1	1	$ 13
Loans [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	13	26
Purchased-credit impaired	0	0
Total loans	$ 13	$ 26

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- Definition

Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount, before allowance for credit loss, of financing receivable.

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