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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Qualified Affordable Housing Investments, Impairment Loss |  |  | $ 0 |  | $ 0
Loans Repurchased Under Make Whole Requests | $ 3,000,000 |  | $ 3,000,000 |  | 5,000,000
Loans Sold To Outside Investors Loss Reimbursement Settlement Paid |  |  |  |  | 0
Make Whole Requests, Loan Origination Date, Majority |  |  | Jan. 01, 2021 |  |
Loans Sold To Outside Investors Original Amount | 4,200,000,000 |  | $ 4,200,000,000 |  |
Loans Sold To Outside Investors Remaining Outstanding Amount | 3,500,000,000 |  | 3,500,000,000 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 35,776,000 |  | 35,776,000 |  | 34,776,000
Financing Receivable, before Allowance for Credit Loss | 29,990,897,000 |  | 29,990,897,000 |  | 29,216,218,000
Loss on Sale of Investments |  |  |  |  | 0
Residential Mortgage [Member] |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 775,000 |  | 775,000 |  | 835,000
Residential Mortgage [Member] | Recourse |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 14,000,000 |  | 14,000,000 |  | 15,000,000
Residential Mortgage [Member] | Recourse | Credit Risk |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 99,000,000 |  | 99,000,000 |  | 16,000,000
Loss on Sale of Investments |  |  | 0 |  |
Affordable Housing Projects and Other [Member] |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Other Investments | 213,000,000 |  | 213,000,000 |  | 219,000,000
Investment, Proportional Amortization Method, Elected, Amount | 211,000,000 |  | 211,000,000 |  | 215,000,000
Expense Related to Qualified Affordable Housing Projects | 9,000,000 | $ 9,000,000 | 26,000,000 | $ 26,000,000 |
Accrued Liabilities | 44,000,000 |  | 44,000,000 |  | 27,000,000
Private SBA Loan Fund [Member] |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Equity Securities, FV-NI | 3,000,000 |  | 3,000,000 |  |
Loan Pool CRA Investments [Member] |  |  |  |  |
Schedule of lending-related and other commitments [Line Items] |  |  |  |  |
Other Investments | $ 52,000,000 |  | $ 52,000,000 |  | $ 40,000,000

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