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Disclosures about fair value of assets and liabilities (Details 4) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Other assets measured at fair value on a nonrecurring basis    
Impaired loans $ 8,109 $ 8,652
Mortgage servicing rights 5,461 5,145
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Other assets measured at fair value on a nonrecurring basis    
Impaired loans      
Mortgage servicing rights      
Significant Other Observable Inputs (Level 2) [Member]
   
Other assets measured at fair value on a nonrecurring basis    
Impaired loans      
Mortgage servicing rights      
Significant Unobservable Inputs (Level 3) [Member]
   
Other assets measured at fair value on a nonrecurring basis    
Impaired loans 8,109 8,652
Mortgage servicing rights $ 5,461 $ 5,145