Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]
Income taxes on change in unrealized gain	$ 310	$ 91	$ 258	$ 145
Cash dividends declared per share	$ 0.18	$ 0.18	$ 0.36	$ 0.36