Consolidated Statement 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 Statement Of Changes In Stockholders Equity Parenthetical
Tax effect of unrealized gain (loss) on securities available for sale	$ (119)	$ 71	$ 551
Tax effect of reclassification adjustment for net security (gain) loss, included in net income		(13)	8
Tax effect of amortization of unrealized gain on securities available for sale transferred to securities held to maturity included in net income	(178)	(168)	(60)
Tax effect of unrealized loss on interest rate swap	(116)	(287)	(31)
Tax effect of reclassification adjustment of interest rate swap settlements included in earnings	$ 68	$ 72	$ 21
Cash dividend per share	$ 0.742	$ 0.705	$ 0.686