Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement Of Income and Comprehensive Income [Abstract]
Unrealized holding gains arising during the period, Tax expense (in dollars)	$ 33	$ 267
Reclassification adjustment for gains included in net income, Tax expense (in dollars)	$ 46	$ 43