Income Taxes (Schedule Of Income Tax Expenses And Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Computed tax expense at statutory rate									$ 2,713	$ 2,479	$ 6,897
State taxes									448	1,877	1,486
Tax-exempt interest income									(4,165)	(4,304)	(1,898)
Foreign income tax rate difference									(163)	(591)
Meals and entertainment									196
Other nondeductible items									1,020
Valuation allowance - domestic									884	(14,485)
Valuation allowance - foreign									395	354
Other									122	147	282
Income Tax Expense (Benefit), Total	$ 12,267	$ (5,706)	$ (2,684)	$ (2,427)	$ (13,929)	$ (3,560)	$ 1,343	$ 1,623	$ 1,450	$ (14,523)	$ 6,767