Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Details Textuals) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Dec. 31, 2023
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Expense Related to Qualified Affordable Housing Projects	$ 9,000,000
Remaining Investment in Qualified Affordable Housing Projects	212,000,000		$ 215,000,000
Variable Interest Entity Reporting Entity Involvement Unfunded Obligation Amount	31,000,000		27,000,000
Qualified Affordable Housing Investments, Impairment Loss	0	$ 0
Loans Repurchased Under Make Whole Requests	$ 1,000,000		5,000,000
Loans Sold To Outside Investors Loss ReimbursementSettlement Paid		$ 0
Make Whole Requests, Loan Origination Date, Majority	Jan. 01, 2021
Loans Sold To Outside Investors Original Amount	$ 3,900,000,000
Loans Sold To Outside Investors Remaining Outstanding Amount	3,300,000,000
Mortgage Repurchase Reserve	704,000		835,000
Residential Mortgage Loans Sold With Recourse Risk	15,000,000
Residential Mortgage Loans Sold With Credit Recourse Risk	37,000,000		16,000,000
Residential Mortgage Loans with Credit Risk Recourse	0		0
SBA Loan Fund, Remaining Unfunded Equity Contribution	3,000,000
UnconsolidatedProjectsLowIncomeHousing [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	215,000,000		$ 219,000,000
PrincipalInvestmentCommitment [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Other Investments	$ 40,000,000