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Foreclosed Property - Major classifications of foreclosed properties (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Classifications of foreclosed properties        
Total foreclosed property $ 21,713 $ 25,218 $ 49,633  
Less valuation allowance (4,979) (6,954) (17,746) (18,982)
Foreclosed property, net 16,734 18,264 31,887  
Balance as a percentage of original loan unpaid principal 45.00% 39.70% 36.10%  
Residential mortgage
       
Classifications of foreclosed properties        
Total foreclosed property 3,768 5,192 6,757  
Residential construction
       
Classifications of foreclosed properties        
Total foreclosed property 8,260 11,454 28,147  
Commercial Portfolio Segment
       
Classifications of foreclosed properties        
Total foreclosed property 9,685 8,572 14,729  
Commercial Portfolio Segment | Commercial real estate
       
Classifications of foreclosed properties        
Total foreclosed property 6,658 6,368 11,463  
Commercial Portfolio Segment | Commercial construction
       
Classifications of foreclosed properties        
Total foreclosed property $ 3,027 $ 2,204 $ 3,266