Fair Values of Assets and Liabilities (Details 4) (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 realized on assets measured on non-recurring basis
Impaired loans	$ (3,086)	$ (10,297)	$ (3,742)	$ (21,157)
Other real estate owned	(163)	(4,124)	(3,017)	(4,124)
Total losses	$ (3,249)	$ (14,421)	$ (6,759)	$ (25,281)