Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per 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]
Other comprehensive income (losses), tax	$ (763)	$ 711	$ (1,157)
Cash dividend declared per share (in dollars per share)	$ 1.10	$ 1.00	$ 0.91