Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 128,438	$ 130,359	$ 142,060
State and local income taxes, net of federal tax benefit	12,633	12,260	14,697
Tax-exempt interest, net of cost to carry	(7,002)	(8,473)	(9,002)
Effective Income Tax Rate Reconciliation, Non-deductible FDIC insurance premium, Amount	2,101	1,376	1,090
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount	(1,176)	(1,669)	(2,941)
Other	(445)	(1,495)	(193)
Total income tax expense	$ 134,549	$ 132,358	$ 145,711