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Fair value measurements (Details 4) (Fair Value, Inputs, Level 3, USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Fair value measurements  
Fair value $ 4,959
Residential loan | Fair value of property or collateral
  
Fair value measurements  
Fair value 4,028
Appraised value, weighted average rate (as a percent) 81.00% [1]
Residential loan | Fair value of property or collateral | Minimum
  
Fair value measurements  
Appraised value (as a percent) 44.00% [1]
Residential loan | Fair value of property or collateral | Maximum
  
Fair value measurements  
Appraised value (as a percent) 96.00% [1]
Home equity line of credit | Fair value of property or collateral
  
Fair value measurements  
Fair value 172
Appraised value, weighted average rate (as a percent) 50.00% [1]
Home equity line of credit | Fair value of property or collateral | Minimum
  
Fair value measurements  
Appraised value (as a percent) 46.00% [1]
Home equity line of credit | Fair value of property or collateral | Maximum
  
Fair value measurements  
Appraised value (as a percent) 50.00% [1]
Commercial loan 2 | Fair value of property or collateral
  
Fair value measurements  
Fair value 759
Fair value, weighted average rate (as a percent) 60.00% [1]
Commercial loan 2 | Fair value of property or collateral | Minimum
  
Fair value measurements  
Fair value of business assets (as a percent) 31.00% [1]
Commercial loan 2 | Fair value of property or collateral | Maximum
  
Fair value measurements  
Fair value of business assets (as a percent) 91.00% [1]
Real estate acquired in settlement of loans | Fair value of property or collateral
  
Fair value measurements  
Fair value $ 192
Appraised value, weighted average rate (as a percent) 90.00% [1]
Real estate acquired in settlement of loans | Fair value of property or collateral | Minimum
  
Fair value measurements  
Appraised value (as a percent) 81.00% [1]
Real estate acquired in settlement of loans | Fair value of property or collateral | Maximum
  
Fair value measurements  
Appraised value (as a percent) 95.00% [1]
[1] Represent percent of outstanding principal balance.