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Other Real Estate Owned and Property Acquired in Settlement of Loans (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Repossessed Assets [Abstract]      
Decrease in total OREO and foreclosed assets $ (47,300,000)    
Total OREO and foreclosed assets as a percentage of total nonperforming assets 44.30% 51.00%  
Real estate acquired in settlement of loans 62,796,000 110,009,000 62,058,000
Personal property acquired in settlement of loans 335,000 377,000  
Total property acquired in settlement of loans $ 63,131,000 $ 110,386,000