Other Real Estate (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other real estate	$ 139,653,000		$ 139,653,000		$ 150,271,000
Loans foreclosed and transferred to other real estate			53,200,000	75,100,000
Foreclosed real estate expense, net	7,502,000	20,708,000	18,441,000	43,680,000
Write-downs to net realizable value and losses resulting from sales transactions	$ 5,500,000	$ 16,500,000	$ 14,314,000	$ 33,859,000