Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 130,359	$ 142,060	$ 92,683
Tax-exempt interest, net of cost to carry	(8,473)	(9,002)	(10,013)
State and local income taxes, net of federal tax benefit	12,260	14,697	7,357
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount	(1,669)	(2,941)	(3,090)
Other	(119)	897	356
Total income tax expense	$ 132,358	$ 145,711	$ 87,293