Other Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other real estate	$ 85,472,000	$ 112,629,000
Loans foreclosed and transferred to other real estate	58,600,000	88,700,000	155,800,000
Foreclosed real estate expense, net	25,321,000	33,864,000	90,655,000
Write-downs to net realizable value and losses resulting from sales transactions	$ (22,085,000)	$ (25,508,000)	$ (73,940,000)