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Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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	$ 70,278	$ 64,850	$ 15,232	$ 27,155
U.S. Treasury [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	4,053
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	26,034	16,124	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	3,771	4,929	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	40,473	37,659	8,577	20,405
Commercial 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	$ 0	$ 2,085