Other Real Estate (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Other Real Estate and Foreclosed Assets [Abstract]
Other real estate	$ 174,941,000		$ 174,941,000		$ 204,232,000
Loans foreclosed and transferred to other real estate			75,100,000	133,500,000
Foreclosed real estate expense, net	20,708,000	39,872,000	43,680,000	64,609,000
Write-downs to net realizable value and losses resulting from sales transactions	$ 16,500,000	$ 35,900,000	$ 33,859,000	$ 54,543,000