Loans and Leases Held for Investment - Payment Status of Loan Modifications (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	$ 291,367	$ 261,482
Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	289,092	252,226
30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	2,275	1,399
90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	0	7,857
Commercial | Asset Based
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	29,755	2,296
Commercial | Asset Based | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	29,755	2,296
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	61,110	13,116
Commercial | Venture Capital Loans | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	61,110	13,116
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	1,184	4,645
Commercial | Other Commercial | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	858	3,246
Commercial | Other Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	326	1,399
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	247	8
Consumer | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	247	8
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
Residential Real Estate Construction Financing Receivable
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd		3,120
Residential Real Estate Construction Financing Receivable | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd		3,120
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
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 | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	154,326	193,956
Commercial | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	152,377	186,826
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	1,949	0
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	7,130
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	1,469	4,869
Other Residential Real Estate | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	1,469	4,142
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	0	0
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	0	$ 727
Multifamily | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	43,276
Multifamily | Real Estate Mortgage | Current
Financing Receivable, Past Due [Line Items]
Finance Receivable, Loan Restructuring and Refinancing, Payment Status qtd	43,276
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