Components of Other Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of Other Comprehensive Income [Abstract]
Tax on unrealized holding gains on available-for-sale securities arising during the period	$ (14)	$ 203	$ 543	$ 498
Tax on reclassification adjustment for net gains realized in net income	327	327	266	327
Tax on reclassification adjustment for other-than-temporary impairment losses on debt securities	$ 0	$ 208	$ 69	$ 393