Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2022
Schedule of lending-related and other commitments [Line Items]
Investment Program, Proportional Amortization Method, Elected, Impairment Loss	$ 0	$ 0	$ 0
Loans repurchased under make whole requests	3,500,000	3,200,000
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				$ 3,900,000,000
Loans sold to outside investors remaining outstanding amount	$ 1,800,000,000
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	41,276,000	38,776,000
Financing Receivable, before Allowance for Credit Loss	31,163,614,000	29,768,586,000
Residential Mortgage [Member]
Schedule of lending-related and other commitments [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	300,000	600,000
Residential Mortgage [Member] | Recourse [Member]
Schedule of lending-related and other commitments [Line Items]
Financing Receivable, before Allowance for Credit Loss	11,400,000	13,700,000
Residential Mortgage [Member] | Recourse [Member] | Credit Risk [Member]
Schedule of lending-related and other commitments [Line Items]
Financing Receivable, before Allowance for Credit Loss	273,400,000	133,800,000
Loss on Sale of Investments	0	0
Affordable Housing Projects and Other [Member]
Schedule of lending-related and other commitments [Line Items]
Other Investments	174,300,000	204,800,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense	35,500,000	34,800,000	$ 34,100,000
Investment, Proportional Amortization Method, Elected, Amount	172,200,000	202,800,000
Accrued Liabilities	22,800,000	29,700,000
Loan Pool CRA Investments [Member]
Schedule of lending-related and other commitments [Line Items]
Other Investments	$ 62,300,000	$ 54,100,000