Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	$ 15,232	$ 27,155
U.S. Government Sponsored Entities [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	2,000	2,000
States and political subdivisions [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	4,655	4,750
Residential mortgage and asset backed [Member]
Sale securities reported as Level 1 securities as of the beginning of the period were transferred to the Level 2 category
Securities transferred to level 2 fair value	$ 8,577	$ 20,405