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Loans and Allowance for Loan Losses - Schedule of Current, Accruing Past Due, and Non-Accrual Loans on an Amortized Cost Basis by Loan Portfolio Class (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	$ 108,296	$ 128,397
Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	73,623	109,918
Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	1,111	1,013
Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	33,562	17,466
Total commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	30,594	116,588
Total commercial and industrial | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	28,984	102,495
Total commercial and industrial | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	1,005	829
Total commercial and industrial | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	605	13,264
Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	27,599	42,801
Total commercial and industrial | Commercial, financial and agricultural | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	26,239	29,386
Total commercial and industrial | Commercial, financial and agricultural | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	1,005	829
Total commercial and industrial | Commercial, financial and agricultural | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Commercial, financial and agricultural | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	355	12,586
Total commercial and industrial | Owner-occupied
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	2,995	73,787
Total commercial and industrial | Owner-occupied | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	2,745	73,109
Total commercial and industrial | Owner-occupied | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Owner-occupied | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Owner-occupied | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	250	678
Total commercial real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	76,497	6,798
Total commercial real estate | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	44,100	4,886
Total commercial real estate | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	32,397	1,912
Total commercial real estate | Investment properties
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	76,497	2,848
Total commercial real estate | Investment properties | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	44,100	2,533
Total commercial real estate | Investment properties | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Investment properties | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Investment properties | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	32,397	315
Total commercial real estate | 1-4 family properties
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	2,804
Total commercial real estate | 1-4 family properties | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	1,207
Total commercial real estate | 1-4 family properties | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | 1-4 family properties | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | 1-4 family properties | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	1,597
Total commercial real estate | Land and development
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	1,146
Total commercial real estate | Land and development | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	1,146
Total commercial real estate | Land and development | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Land and development | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Land and development | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	1,205	5,011
Total consumer | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	539	2,537
Total consumer | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	106	184
Total consumer | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	560	2,290
Total consumer | Consumer mortgages
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	331	2,578
Total consumer | Consumer mortgages | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	1,184
Total consumer | Consumer mortgages | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Consumer mortgages | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Consumer mortgages | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	331	1,394
Total consumer | Home equity
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	714
Total consumer | Home equity | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	714
Total consumer | Home equity | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Home equity | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Home equity | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Other consumer loans
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	874	1,719
Total consumer | Other consumer loans | Current
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	539	639
Total consumer | Other consumer loans | Accruing 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	106	184
Total consumer | Other consumer loans | Accruing 90 Days or Greater Past Due
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Other consumer loans | Non-accrual
Financing Receivable, Modified [Line Items]
Amortized cost basis of loans, aging analysis	$ 229	$ 896

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