Fair Value Measurement (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Losses resulting from nonrecurring fair value adjustments that occurred in the periods indicated
Impaired originated loan	$ 1,686	$ 1,932	$ 6,142	$ 8,314
Non-covered foreclosed assets	433	306	1,059	799
Covered foreclosed assets			461	594
Total loss from nonrecurring fair value adjustments	$ 2,119	$ 2,238	$ 7,662	$ 9,707