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v3.25.1

Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2024
Other Commitments [Line Items] |  |  |  |
Investment Program, Proportional Amortization Method, Elected, Impairment Loss | $ 0 |  | $ 0 |
Loans Repurchased Under Make Whole Requests | $ 866,000 |  |  | $ 3,000,000
Loans Sold To Outside Investors Loss Reimbursement Settlement Paid |  |  | 0 |
Make Whole Requests, Loan Origination Date, Majority | Jan. 01, 2022 |  |  |
Loans Sold To Outside Investors Original Amount | $ 3,400,000,000 |  |  |
Loans Sold To Outside Investors Remaining Outstanding Amount | 1,400,000,000 |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 35,276,000 |  |  | 38,776,000
Financing Receivable, before Allowance for Credit Loss | 30,294,127,000 |  |  | 29,768,586,000
Loss on Sale of Investments |  |  | $ 0 |
Residential Mortgage [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 584,000 |  |  | 553,000
Residential Mortgage [Member] | Recourse |  |  |  |
Other Commitments [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 13,000,000 |  |  | 14,000,000
Residential Mortgage [Member] | Recourse | Credit Risk |  |  |  |
Other Commitments [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 159,000,000 |  |  | 134,000,000
Loss on Sale of Investments | 0 |  |  |
Affordable Housing Projects and Other [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Other Investments | 196,000,000 |  |  | 205,000,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense | 9,000,000 | $ 9,000,000 |  |
Investment, Proportional Amortization Method, Elected, Amount | 194,000,000 |  |  | 203,000,000
Accrued Liabilities | 26,000,000 |  |  | 30,000,000
Private SBA Loan Fund [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Equity Securities, FV-NI | 3,000,000 |  |  |
Loan Pool CRA Investments [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Other Investments | $ 58,000,000 |  |  | $ 54,000,000

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