Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investments for Past Due Loans at Amortized Cost (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Sep. 30, 2025
Current [Member]
Financing Receivable, Modified [Line Items]
Total	$ 26,835	$ 10,713
30-89 Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0	43
90+ Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0	0
Commercial Real Estate [Member] \| Current [Member]
Financing Receivable, Modified [Line Items]
Total		8,386
Commercial Real Estate [Member] \| 30-89 Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total		43
Commercial Real Estate [Member] \| 90+ Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total		0
CRE - Non-owner occupied [Member] \| Current [Member]
Financing Receivable, Modified [Line Items]
Total	1,694
CRE - Non-owner occupied [Member] \| 30-89 Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0
CRE - Non-owner occupied [Member] \| 90+ Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0
Commercial and Industrial [Member] \| Current [Member]
Financing Receivable, Modified [Line Items]
Total	20,306	1,932
Commercial and Industrial [Member] \| 30-89 Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0	0
Commercial and Industrial [Member] \| 90+ Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0	0
Dairy & Livestock and Agribusiness [Member] \| Current [Member]
Financing Receivable, Modified [Line Items]
Total	4,835	395
Dairy & Livestock and Agribusiness [Member] \| 30-89 Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	0	0
Dairy & Livestock and Agribusiness [Member] \| 90+ Days Past Due [Member]
Financing Receivable, Modified [Line Items]
Total	$ 0	$ 0