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Loans and Leases - Payment Status of Loan Modifications (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	$ 194,750	$ 17,931
Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	173,352	8,841
30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	17,412	7,666
90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	3,986	1,424
Commercial | Asset Based [Member]
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,195
Commercial | Asset Based [Member] | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,195
Commercial | Asset Based [Member] | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Commercial | Asset Based [Member] | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Commercial | Venture Capital Loans
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	13,156
Commercial | Venture Capital Loans | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	13,156
Commercial | Venture Capital Loans | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Commercial | Venture Capital Loans | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Commercial | Other Commercial
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	3,833	2,603
Commercial | Other Commercial | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	672	2,599
Commercial | Other Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	3,161	4
Commercial | Other Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	11	17
Consumer | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	11	17
Consumer | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	0
Consumer | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	0
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	168,366
Commercial | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	154,206
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	14,160
Commercial | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	7,189	15,311
Other Residential Real Estate | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	3,112	6,225
Other Residential Real Estate | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	91	7,662
Other Residential Real Estate | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	$ 3,986	$ 1,424

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

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