Consolidated Statements Of Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash dividend declared, per share	$ 0.08	$ 0.13	$ 0.27
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge, tax	$ 117,000	$ 130,000	$ 143,000
Change in unrealized gains or losses on marketable securities available-for-sale, tax	0	0	43,000
Accounting Standards Update 2010-11
Cumulative effect of adopting the guidance on evaluation of credit derivatives embedded in beneficial interests in securitized financial assets, tax			$ 370,000