Accumulative Other Comprehensive Income (Loss) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated other comprehensive loss, net of tax
Accumulated other comprehensive income (loss) at beginning of period	$ 74	$ (2,011)
Other comprehensive income (loss) before reclassification	(29)	752
Amount reclassified from accumulated other comprehensive income	(3)	(2)
Net current-period other comprehensive income (loss)	(32)	750
Accumulated other comprehensive income (loss) at end of period	42	(1,261)
Unrealized gain (loss) on available-for-sale securities
Accumulated other comprehensive loss, net of tax
Accumulated other comprehensive income (loss) at beginning of period	74	(2,011)
Other comprehensive income (loss) before reclassification	(29)	752
Amount reclassified from accumulated other comprehensive income	(3)	(2)
Net current-period other comprehensive income (loss)	(32)	750
Accumulated other comprehensive income (loss) at end of period	$ 42	$ (1,261)