Summary of Significant Accounting Policies 3 (Details) (Accumulated Other Comprehensive Income (Loss), USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gains on securities available-for-sale	$ 11,836	$ 10,066
Unrealized gain (loss) on available-for-sale securities, tax benefit	(4,614)	(3,924)
Total unrealized gain (loss) on available for sale securities, net of tax	7,222	6,142
Securities with other-than-temporary impairment losses	(4,389)	(4,906)
Securities with other-than-temporary impairment losses, tax benefit	1,711	1,912
Total securities with other-than-temporary impairment losses, net of tax	(2,678)	(2,994)
Accumulated other comprehensive income, tax	(2,903)	(2,012)
Total accumulated other comprehensive income, net of tax	$ 4,544	$ 3,148