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Income Taxes (Schedule Of Company's Actual Income Tax Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Computed “expected” tax expense $ 92,683 $ 111,364 $ 113,293
Tax-exempt interest, net of cost to carry (10,013) (10,973) (11,502)
State and local income taxes, net of federal tax benefit 7,357 11,953 9,748
Effective Income Tax Rate Reconciliation, Share-based Award Payments, Amount (3,090) (3,337) (3,928)
Other 356 67 (1,662)
Total income tax expense $ 87,293 $ 109,074 $ 105,949