Loans and Allowance for Credit Losses - Payment Performance Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	$ 6,757	$ 5,540
Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	1,903	3,555
60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	445	0
Greater Than 90 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	1,458	2,044
Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	4,854	1,985
Commercial & industrial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	4,482	3,496
Commercial & industrial loans | Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	1,511
Commercial & industrial loans | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	1,511
Commercial & industrial loans | Greater Than 90 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	0
Commercial & industrial loans | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	4,482	1,985
Commercial real estate | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	231	271
Commercial real estate | Total Past Due | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	231	271
Commercial real estate | 60-89 Days Past Due | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	0
Commercial real estate | Greater Than 90 Days Past Due | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	231	271
Commercial real estate | Current | Owner occupied properties
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	0
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	472	119
Residential real estate | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	99	109
Residential real estate | Total Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	100	119
Residential real estate | Total Past Due | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	99	109
Residential real estate | 60-89 Days Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	100	0
Residential real estate | 60-89 Days Past Due | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	0
Residential real estate | Greater Than 90 Days Past Due | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	119
Residential real estate | Greater Than 90 Days Past Due | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	99	109
Residential real estate | Current | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	372	0
Residential real estate | Current | 1-4 family residential construction loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	0	0
Other construction, land development and raw land loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	1,473	1,545
Other construction, land development and raw land loans | Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	1,473	1,545
Other construction, land development and raw land loans | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	345	0
Other construction, land development and raw land loans | Greater Than 90 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	1,128	1,545
Other construction, land development and raw land loans | Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, modified	$ 0	$ 0