Basis of Accounting and Consolidation 3 (Details) (Accumulated Other Comprehensive Income (Loss) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gains on securities available-for-sale	$ (6,778)	$ 11,836
Unrealized gain (loss) on available-for-sale securities, tax benefit	2,642	(4,614)
Total unrealized gain (loss) on available for sale securities, net of tax	(4,136)	7,222
Securities with other-than-temporary impairment losses	(3,955)	(4,389)
Securities with other-than-temporary impairment losses, tax benefit	1,542	1,711
Total securities with other-than-temporary impairment losses, net of tax	(2,413)	(2,678)
Accumulated other comprehensive income, tax	4,184	(2,903)
Total accumulated other comprehensive income, net of tax	$ (6,549)	$ 4,544