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Other Real Estate Owned and Property Acquired in Settlement of Loans (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Repossessed Assets [Abstract]            
Decrease in total OREO and foreclosed assets $ 24,000,000          
Total OREO and foreclosed assets as a percentage of total nonperforming assets 47.00%   51.00%      
Real estate acquired in settlement of loans 86,183,000 104,193,000 110,009,000 101,384,000 67,331,000 62,058,000
Personal property acquired in settlement of loans 217,000   377,000      
Total property acquired in settlement of loans $ 86,400,000   $ 110,386,000