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Loans and Leases Held for Investment - Payment Status of Loan Modifications (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	$ 352,898	$ 194,750
Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	346,212	173,352
30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	4,489	17,412
90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,197	3,986
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,985
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,985
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Commercial | Asset Based
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	62,510	2,195
Commercial | Asset Based | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	62,510	2,195
Commercial | Asset Based | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	0
Commercial | Asset Based | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	0
Commercial | Venture Capital Loans
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	66,617	13,156
Commercial | Venture Capital Loans | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	66,617	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	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	0
Commercial | Other Commercial
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	5,317	3,833
Commercial | Other Commercial | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	1,799	672
Commercial | Other Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	3,518	3,161
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	5	11
Consumer | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	5	11
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	142,746	168,366
Commercial | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	142,746	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	0	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	0
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	5,272	7,189
Other Residential Real Estate | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,104	3,112
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	971	91
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	2,197	$ 3,986
Multifamily | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	67,446
Multifamily | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	67,446
Multifamily | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0
Multifamily | 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

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