Fair Value Measurement (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
Losses resulting from nonrecurring fair value adjustments that occurred in the periods indicated
Impaired originated loan	$ 2,987	$ 5,551	$ 4,456	$ 7,676
Non-covered foreclosed assets	543	425	626	493
Covered foreclosed assets	461	213	461	594
Total loss from nonrecurring fair value adjustments	$ 3,991	$ 6,189	$ 5,543	$ 8,763