CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract]
Change in unrealized loss on available-for-sale securities during the period, deferred benefit (tax)	$ 1,563	$ 605	$ 858
Release from treasury stock for restricted stock award and BMP award shares, net of return of shares to treasury for forfeited shares	150,173	169,376	109,824
Shares issued in exercise of options (in shares)	455,051	346,489	87,825