Taxes On Income (Reconciliation from the Expected Tax Expense (Benefit) Using the U.S. Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Taxes On Income [Abstract]
Computed tax (benefit) expense at statutory rates	$ 9,630	$ 9,520	$ 11,777
Increase (decrease) in income taxes results from:
Benefit of income not subject to U.S. Federal income tax	(632)	(621)	(209)
Expenses not deductible for U.S. Federal income tax	216	220	129
State income taxes, net of Federal income tax benefit	621	736	907
Other	(26)	(62)	13
Income Tax Expense (Benefit), Total	$ 9,809	$ 9,793	$ 12,617