Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
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	$ 0	$ 15,232
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	0	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	0	4,655
Residential mortgage & asset backed securities [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	$ 0	$ 8,577