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